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Result-Driven Process ⭐ 150+ Successful Projects ⭐

4.8
21 reviews
Silver
VERIFIED

For over ten years Selleo has delivered professional services on more than 150+ software development projects for clients from Europe, the US, Canada, and Australia, designing and building a number of applications throughout a wide spectrum of business domains, industries, and technologies (Ruby on Rails, ReactJS, React Native, EmberJS, Elixir).

Extend your in-house team

Whenever you want to handle a new project, deliver essential features or need a staff with specialized skills or industry expertise, our full-stack developers help you to increase overall productivity. We work in collocated agile teams crafting web and mobile applications with an entrepreneurial sense of ownership.

Embrace tech stack complexity 

Our expert developers have not only the current capabilities you need but also an ability to build new ones rapidly. With the vast diversity of skills required and partnership with other specialized companies, we can deliver even the most technologically challenging software solutions.

Industry Expertise

Through the years we have gathered a broad spectrum of specialization in the development of custom SaaS and cloud-based business process management tools, digital dashboards, LMS and e-learning services, AdTech and marketing platforms, data analytics and processing solutions. We enable clients to efficiently optimize and innovate processes, products, and business ventures by developing single page applications, designing microservices architecture and crafting web and mobile applications.

READ MORE...
 
$10,000+
 
$25 - $49 / hr
 
50 - 249
 Founded
2005
Show all +
Bielsko-Bała, Poland
headquarters
  • Powstańców Śląskich 3
    Bielsko-Bała 43-300
    Poland
other locations
  • Silesian
    Poland

Portfolio

Key clients: 

Agencies

Marketing or software related companies with multiple projects and big brand clients.

Product Companies

SMEs or well-funded startups who augment their in-house teams to reduce development time or need some domain/technology expertise.

NorthPass Image

NorthPass

The NorthPass is an innovative learning management system (LMS) that enables organizations to train employees, customers and channel partners.

This SaaS platform is aimed to provide tools for the creation and distribution of training content and allows its users to build and scale branded training experiences. 

Catalyst Image

Catalyst

The Catalyst is an internal e-health single page application which aims to provide advanced access to relevant health information, enhance the quality of care, reduce errors and increase collaboration. 

Simplaex Image

Simplaex

The Simplaex is a SaaS platform which allows game developers and publishers to create revenue from their current players and acquire new ones. This self-service platform uses the latest personalization technologies to reach players with custom messages and build lasting relationships with them. 

BattleRiff Image

BattleRiff

Battleriff is an online eSports service which enables players from around the globe to challenge real opponents in popular games such as HearthStone or MTG Arena.

As gaming and esports are one of the fastest growing online activities our client targets some of the 800 million active users.

9teams Image

9teams

The 9teams is an enterprise collaboration platform ensuring running the meeting and taking minutes with access to the information and resources required, at any given time.

This meeting management software allows users to improve collaboration effectiveness and, with a set of dedicated functionalities, facilitates the way organizations are conducting meetings. 

Alyne Image

Alyne

The Alyne SaaS platform aids organisations such as Allianz, Deloitte or Barclays in maturing their cybersecurity, risk management, and compliance capabilities, and helps companies to make smart, well-informed and risk-aware decisions to secure their digital assets in a cost-effective way.

A real-time dashboard with highly flexible funnels enables

…
fast access to assessment results, reports and insights.
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Reviews

4.8
21 reviews
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App Dev for Community & Social Organization

"They have strong leadership, offer a good value, and they're flexible."

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5.0

Quality: 
5.0
Schedule: 
5.0
Cost: 
5.0
Willing to refer: 
5.0
The Project
 
$50,000 to $199,999
 
Jan. 2020 - Ongoing
Project summary: 

Selleo developed a web app; they set up the architecture and created the solution, which involved DevOps.

The Reviewer
 
1-10 Employees
 
New York, New York
Chris Mitchell
CEO, Better Off Social
 
Verified
The Review
Feedback summary: 

The client is exceptionally pleased, as Selleo's reliable, flexible approach differentiates them from other partners. Rather than producing a generic project plan, they crafted one that fit the client's unique needs. The team maintained regular communication with internal stakeholders.

The client submitted this review online.

BACKGROUND

Please describe your company and your position there.

We run large sports leagues, community events, brunches, and more in cities all throughout the United States. I'm the CEO.

OPPORTUNITY / CHALLENGE

For what projects/services did your company hire Selleo?

We initially contracted with a terrible company that tried to massively overbill us and did next to no work - they were completely incompetent. Selleo came in and rescued the project and saved the day. Then, when the pandemic hit, they helped us pivot and worked with us. We're now in good shape when it seemed like we would never finish the project before.

What were your goals for this project?

Create a complex rails app that would allow us to run our businesses as scale.

SOLUTION

How did you select this vendor?

We interviewed all the top Polish and Ukrainian Rails developer firms. Selleo treated us like an intelligent partner rather than trying to sell us with telling us everything we wanted to hear or making vague promises. They brought in the lead dev the first meeting and we met with them numerous times before starting the project. The dev gave us a great plan rather than a cookie cutter one. We decided to go with Selleo.

Describe the project and the services they provided in detail.

They planned, setup architecture, and developed the site - as well as doing dev ops. In short, they did everything we needed to get the app/website up and running and launched.

What was the team composition?

Lead dev, three other rails devs and a designer/frontend dev

RESULTS & FEEDBACK

Can you share any information that demonstrates the impact that this project has had on your business?

Still ongoing, but the difference between them and the previous teams we've worked with have been night and day.

How was project management arranged and how effective was it?

Project was managed by lead dev - we met once a week but the lead dev and I would chat throughout week via slack and sometimes would do one meeting a day. We used pivotal tracker to track progress.

What did you find most impressive about this company?

They have strong leadership, offer a good value, and they're flexible.

Are there any areas for improvement?

None for now

5.0
Overall Score
  • 5.0 Scheduling
    ON TIME / DEADLINES
  • 5.0 Cost
    Value / within estimates
  • 5.0 Quality
    Service & deliverables
  • 5.0 NPS
    Willing to refer

Development for a Property Management Platform

"We appreciate how invested Selleo is in our product."

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5.0

Quality: 
5.0
Schedule: 
4.5
Cost: 
4.5
Willing to refer: 
5.0
The Project
 
$200,000 to $999,999
 
Mar. 2017 - Ongoing
Project summary: 

Supplementing resources in-house, the team at Selleo provides development support for a software startup. The team developed and designed a React web platform and native mobile application.

The Reviewer
 
11-50 Employees
 
Boston, Massachusetts
Nate Oaks
CTO & Co-Founder, Breezeway
 
Verified
The Review
Feedback summary: 

The team at Selleo has been positively received internally. Their dedication to the success of the company is noteworthy. They’re skilled and responsive. Customers can anticipate a real partnership while working with them.

A Clutch analyst personally interviewed this client over the phone. Below is an edited transcript.

BACKGROUND

Introduce your business and what you do there.

I’m the CTO at Breezeway. We provide software for property managers and service companies to run their operations.

OPPORTUNITY / CHALLENGE

What challenge were you trying to address with Selleo?

Since we’re a startup, they were our first development team. We needed them to create a web platform and a native application.

SOLUTION

What was the scope of their involvement?

Selleo’s developers have become part of our team, performing a variety of development work for us. For the web component, their team built our scheduling platform with specific client tools, using React. For the application, they used React Native. The app we’re building is a checklist tool that assigns people tasks. They will be able to complete the checklist, report issues, and take photos that they can send back to their managers.

What is the team composition?

While we’ve rotated different team members, we typically work with three to four developers.

How did you come to work with Selleo?

We were referred to Selleo by someone who was recruiting business for them.

How much have you invested with them?

We’ve invested between $300,000–$400,000.

What is the status of this engagement?

Our engagement with Selleo began in March 2017.

RESULTS & FEEDBACK

What evidence can you share that demonstrates the impact of the engagement?

Internally, it’s been nothing but positive feedback. Since they’re part of our team, we’re regularly reviewing their work. The developers go through the typical QA process that we have for our internal team. We discuss design, code performance & quality, and potential bugs.

How did Selleo perform from a project management standpoint?

From a project management standpoint, it’s pretty good.

What did you find most impressive about them?

We appreciate how invested Selleo is in our product. Their team strives to be part of our organization by learning our business. They’re excited about all of the projects we’re working on. It feels that they brought into what we’re trying to build.

Are there any areas they could improve?

They could pay a bit more attention to the broader platform of building and how the pieces that they’re working on are managed.

Do you have any advice for potential customers?

I think Selleo is excellent. I definitely recommend them.

5.0
Overall Score
  • 4.5 Scheduling
    ON TIME / DEADLINES
  • 4.5 Cost
    Value / within estimates
  • 5.0 Quality
    Service & deliverables
  • 5.0 NPS
    Willing to refer

Development for a Commerce Company

“After three years with the team, we still enjoy working together.”

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5.0

Quality: 
5.0
Schedule: 
5.0
Cost: 
5.0
Willing to refer: 
5.0
The Project
 
$200,000 to $999,999
 
June 2016 - Ongoing
Project summary: 

Selleo developed a custom platform for a visual commerce company. Their team created a web app and an API using Ruby on Rails and Javascript.

The Reviewer
 
2-10 Employees
 
United Kingdom
Founder, BrandActif
 
Verified
The Review
Feedback summary: 

While the work is ongoing, the work completed thus far has exceeded expectations and attracted giant corporate partners. Selleo’s team works methodically to deliver quality solutions that fit precise needs. Proactive and hardworking, they go above and beyond to deliver results ahead of schedule.

A Clutch analyst personally interviewed this client over the phone. Below is an edited transcript.

BACKGROUND

Introduce your business and what you do there.

I am the CEO of a visual commerce company. We use phones to look at the world around you, included TV ads or programs, movies, print, or product packaging, to take consumers on a personalized digital journey.

OPPORTUNITY / CHALLENGE

What challenge were you trying to address with Selleo?

We needed developers to help create this platform.

SOLUTION

What was the scope of their involvement?

Selleo is developing our progressive web app. We also have a SaaS API that goes into a brand’s existing mobile app. Their team works in Ruby on Rails and Javascript.

They ensured that the platform could ingest images, videos, and product shots to churn out a URL. The system captures data along the way to produce conditional logic-based offers. The program picks up keyboard languages, time stamps, and SKU codes.

What is the team composition?

We work with a permanent team of five from Selleo, occasionally scaling up. Sometimes when we have a specific project they’ll pull in somebody else for a short period of time. 

How did you come to work with Selleo?

We had worked with other developers in the past. After moving, I went on the hunt for Ruby on Rails developers, when we had previously worked in .NET. We interviewed three vendors, and Selleo was head and shoulders above the rest so we decided to work with them.

How much have you invested with them?

We have invested between $200,000–$1,000,000.

What is the status of this engagement?

Our ongoing engagement with Selleo began in June 2016.

RESULTS & FEEDBACK

What evidence can you share that demonstrates the impact of the engagement? 

Selleo has built some amazing things as of late. Everything we have collaborated on up to this point has allowed us to create new stuff. This platform is the first of its kind and we have been attracting some giant corporations to partner with.

How did Selleo perform from a project management standpoint?

They’ve been fantastic. Selleo works methodically and correctly, rarely making mistakes. They don’t overpromise, in fact, they probably overdeliver—and that’s a good thing. It’s rare to have someone that anticipates your needs. Their team has never missed a deadline.

What did you find most impressive about them?

The people blow me away, they’ve got a fantastic team. Everyone on their team is motivated and we all get on really well. After three years with the team, we still enjoy working together. The single most important thing is the people at Selleo and how we interact. 

Are there any areas they could improve?

No. I would have loved to have everything done in half the time, but that’s not a criticism of their work, that’s just the process. I’m very satisfied with everything Selleo has done for us. 

Do you have any advice for potential customers?

It’s important to test them and ask them questions. That will allow you to make sure it’s a good fit an also help both teams and uncover what the real commercial needs are. Selleo doesn’t just code, they understand what they’re coding and what the commercial implications could be. It helps to have a team that understands the commerciality behind what we’re trying to do because then they can offer the best advice that might save time or money down the line. That’s why our teams work so well together.

5.0
Overall Score
  • 5.0 Scheduling
    ON TIME / DEADLINES
  • 5.0 Cost
    Value / within estimates
  • 5.0 Quality
    Service & deliverables
  • 5.0 NPS
    Willing to refer

Near-Shore Development Services for SaaS Collaboration Tool

"...they are actively working together with us to make both our processes and software better and better."

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5.0

Quality: 
4.5
Schedule: 
4.5
Cost: 
4.5
Willing to refer: 
5.0
The Project
 
$200,000 to $999,999
 
Jan. 2015 - Ongoing
Project summary: 

Working in tandem with the internal team, Selleo has developed a SaaS platform using EmberJS and Elixir. They've architected the solution, built out features, and designed landing pages/marketing collateral. 

The Reviewer
 
1-10 Employees
 
Belgium
Piet Neirinck
Founder, 9TEAMS
 
Verified
The Review
Feedback summary: 

Selleo's resources are fully committed to the project, acting as an extension of the in-house team. They're able to reframe complex technical challenges to be approachable and find user-friendly solutions. The team's strong work incentive, high standards, and quality code tests make them invaluable.

The client submitted this review online.

BACKGROUND

Please describe your company and your position there.

I am the founder of 9TEAMS. We help ERP teams to stay on top of their implementation and project management. Our ‘state-of-the-art cloud solution’​ allows large and mixed teams to organize work and engage all stakeholders involved.

OPPORTUNITY / CHALLENGE

For what projects/services did your company hire Selleo?

Development of the online project management and collaboration SaaS application.

What were your goals for this project?

Develop a fresh and state-of-the-art solution, that allows all types of users to collaborate.

SOLUTION

How did you select this vendor?

We started with an online selection, based on predefined criteria. After a couple of personal alignments with specific team members, Selleo started working on a limited scope proof of concept.

Describe the project and the services they provided in detail.

I needed a team to design and develop the entire SaaS platform together with landing pages and marketing collateral for the 9 teams They were responsible for app architecture, choosing the right technology stack (EmberJS, Elixir), graphic and UX design and development of all the features and functionalities.

What was the team composition?

I get the complete cross-functional team of six developers and designers and was able to modify the velocity based on the current business needs. There was a Team Leader who acted as a single point of contact for the product development and design team, and a Scrum Master who led the process.

RESULTS & FEEDBACK

Can you share any information that demonstrates the impact that this project has had on your business?

My development team worked for me full-time acting as if they were part of my in-house team. They were able to present complex technical challenges in the user-friendly way. I really enjoyed their engagement, proactiveness in helping me to develop product backlog, and caring about the business success as if it was their own project. They also depend on testing heavily and boost code quality to the highest standards.

How was project management arranged and how effective was it?

As regards the overall approach to managing software development projects, Selleo advocated to follow the rules and principle of Agile methodology. We decided Scrum to be the best solution with Scrum Master on their side and me in the role of a Product Owner. We get through all the Scrum ceremonies and I was impressed with their business orientation during planning meeting.

What did you find most impressive about this company?

Deep integration and engagement between in-house and near-house team.

Are there any areas for improvement?

Of course. Areas for improvement are continuously identified. Good thing about Selleo is that they are actively working together with us to make both our processes and software better and better.

5.0
Overall Score
  • 4.5 Scheduling
    ON TIME / DEADLINES
  • 4.5 Cost
    Value / within estimates
  • 4.5 Quality
    Service & deliverables
  • 5.0 NPS
    Willing to refer

Development for an eSports Platform

"We value their opinion, and they respond by going the extra mile to optimize our product." 

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5.0

Quality: 
5.0
Schedule: 
5.0
Cost: 
5.0
Willing to refer: 
5.0
The Project
 
$200,000 to $999,999
 
Jan. 2016 - Ongoing
Project summary: 

Selleo developed an e-sports solution using React and Ruby on Rails. They helped implement the platform’s design and provided GDPR data consulting. They now act as an ongoing development partner.

The Reviewer
 
2-10 Employees
 
Sweden
Tom Smith
CPO, Battleriff Gaming AB
 
Verified
The Review
Feedback summary: 

Able to work independently, Selleo has become a trusted ongoing partner, capable of delivering quickly. Their industry experience and technical skill allow them to not only implement specifications but make critical product optimizations. Customers can expect a knowledgeable, productive partner.

A Clutch analyst personally interviewed this client over the phone. Below is an edited transcript.

BACKGROUND

Introduce your business and what you do there.

I'm the CPO of Battleriff Gaming AB, an e-sports company. We started off focusing on wager matches within the gaming industry but have since evolved to become a leading community and rewards platform in the digital card game industry. Users can play games and compete on our platform with virtual currency which they can then exchange for rewards ranging from digital codes for games to physical goods like gaming hardware.

OPPORTUNITY / CHALLENGE

What challenge were you trying to address with Selleo?

We had extensive marketing and strategy experience internally, but we didn’t have a robust technical support team, outside of our CTO. The necessity of speeding up our development, especially regarding e-sports, pushed us to look for a technical partner.

SOLUTION

What was the scope of their involvement?

They were responsible for front- and backend development of our platform, for which they used React and Ruby on Rails respectively. They also developed our full feature set including payment systems and a virtual currency with value behind it. As GDPR went into effect, they ensured our platform complied, since we didn’t have any expertise in that area. We also worked with 2–3 designers from Selleo who created the overall design of our platform.

What is the team composition?

We’ve worked with as few as two people and as many as six over the years. The team composition changes depending on our needs.

How did you come to work with Selleo?

I wasn’t really involved in the decision, but I believe our CTO had an existing relationship with them. He was familiar with their quality and knew they had gaming and e-sports experience.

How much have you invested in them?

We've spent between $200,000–$1,000,000.

What is the status of this engagement?

We’ve been working with them since January 2016.

RESULTS & FEEDBACK

What evidence can you share that demonstrates the impact of the engagement?

We’ve developed a significant amount of trust in Selleo, that they can deliver the velocity and quality we need. They understand our expectations at the beginning of every sprint and plan their work to ensure it's in alignment with ours.

How did Selleo perform from a project management standpoint?

Because we’ve been working together for so long, we don’t need to have constant communication. Trello lets them inform us as to what they require, and if they’re unsure about anything they always reach out for more information. We have the occasional weekly stand-up to discuss our current sprint, but after all this time we’ve become seamless partners.

What did you find most impressive about them?

They make everything easier on our side by taking on so many of the technical burdens. This includes everything from platform accessibility issues to new feature creation. While other vendors may simply create what we ask them to, Selleo lets us know if they have another interpretation. We value their opinion, and they respond by going the extra mile to optimize our product.

Are there any areas they could improve?

Sometimes when we need additional weekend support, we'll ask them too late, and they won't be available. Other than that, they go above and beyond to provide us with whatever we need, even if it isn’t strictly within their mandate.

Do you have any advice for potential customers?

Trust them and make an effort to include them in what you’re building. Their experience allows them to act like an in-house team if they understand your process. They’re an incredibly beneficial technical partner.

5.0
Overall Score It’s been absolutely amazing.
  • 5.0 Scheduling
    ON TIME / DEADLINES
  • 5.0 Cost
    Value / within estimates
  • 5.0 Quality
    Service & deliverables
  • 5.0 NPS
    Willing to refer

Development for a Startup Incubator

“Selleo holds themselves to a high standard that I’ve rarely seen in agencies.”

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4.5

Quality: 
5.0
Schedule: 
5.0
Cost: 
4.5
Willing to refer: 
4.5
The Project
 
$50,000 to $199,999
 
Aug. 2018 - Ongoing
Project summary: 

Selleo developed a backend and data pipeline using Python to manage an array of data sources from a third-party client’s external system. They also built a React app to host a customer dashboard on mobile.

The Reviewer
 
11-50 Employees
 
Berlin, Germany
Managing Director, WATTx
 
Verified
The Review
Feedback summary: 

Selleo delivered exceptional results that secured client satisfaction. The deliverable they produced was built rapidly and without fault. Collaborative and engaged, they made a marked effort to fully grasp the scope and objectives to achieve the optimal outcomes. 

A Clutch analyst personally interviewed this client over the phone. Below is an edited transcript.

BACKGROUND

Introduce your business and what you do there.

I’m the managing director at WATTx, a venture startup company. We come up with and invest in startup ideas, build products, and work to get them to market.

OPPORTUNITY / CHALLENGE

What challenge were you trying to address with Selleo?

One of our projects was progressing well and moving quite quickly, but we lacked enough resources. Having completed some research and sketches, we needed to get a product up and running fast. Our client wanted to increase the pace, which required us to scale up our team.

SOLUTION

What was the scope of their involvement?

We had wireframes, sketches, and the business idea prepared. Selleo helped us build a backend where we could integrate our data sources that came from one of our client’s external systems.  Using Python, they helped us create the data pipeline and make it reliable. 

We also needed to develop a dashboard for our customers’ clients. They helped us quickly build a React app. The corresponding desktop application that’s viewable on a mobile device as well. It’s fully reactive. At this point, we’re continuing to the next phase of the project and have also started a new one together. 

What is the team composition? 

Four people from the team worked on our project. The project manager they assigned us was our main point of contact.

How did you come to work with Selleo?

We researched a few different companies and reached out to our network to ask for agency recommendations. One of our employees also had some connections. He used to work with current staff members at Selleo and recommended their company. 

Selleo stood out based on the quality of the projects they had delivered. Their prices were very fair. Some offshore companies have cheaper prices, but also lower quality coders.

How much have you invested with them?

We spent between $50,000–$199,999.

What is the status of this engagement?

We started working together in August 2018, and the work is ongoing.

RESULTS & FEEDBACK

What evidence can you share that demonstrates the impact of the engagement?

Selleo did an exceptional job. Integrations with a corporate system are always a bit of a hassle, and they managed it very well. Of the six developers we’ve met so far, each one has been highly skilled and readily able to understand the goal of our projects.

How did Selleo perform from a project management standpoint?

They dedicated one person to project management. Initially, we were a bit skeptical about the need because we felt we could handle it ourselves. Our head of tech visited their offices for a few days to get them set up on the project and see their style of work. During that time, he met the project manager and thought she performed very well, so we decided to book her for some time. Our tech lead feels we learned much from her.

Our teams established a close integration. We had daily standups and reviews. They got to know the relevant business issues and understood what the project was about. Selleo always clearly communicated with us and we never had any bad surprises. They speak English perfectly. We beat the estimated timeline we set in the beginning. 

What did you find most impressive about them?

They have good quality code, and we like their approach. Selleo holds themselves to a high standard that I’ve rarely seen in agencies. They only deliver projects that are free of software bugs.  The communication between our teams is excellent. 

There were never any surprises because they communicated all the terms and costs. If anything didn’t go well, they openly admitted it. They quickly became part of our team, which helped us a lot.  

Are there any areas they could improve?

Their prices could be lower.

Do you have any advice for potential customers?

If you’re looking for high quality and want a reliable partner, I recommend integrating Selleo into your team. Provide adequate information to help them get deeply involved, and they’ll provide the most value. Their programmers and developers have a lot of experience and can really think for themselves.

If we didn’t specify something clearly, they asked clarifying questions and made useful suggestions. They’ll assign you team members that perform very well, work in sync with your team, and are invested in delivering the project.

4.5
Overall Score The communication and delivery were very good. The whole team is friendly, reactive and responsive. They took ownership for the project.
  • 5.0 Scheduling
    ON TIME / DEADLINES
    We got the project to our client on time. The client was impressed with the work.
  • 4.5 Cost
    Value / within estimates
    They’re not the cheapest, but they deliver good value.
  • 5.0 Quality
    Service & deliverables
    They communicated clearly what they could deliver, followed through, and accurately documented their work. The quality of their code and handoff were great.
  • 4.5 NPS
    Willing to refer
    We were highly satisfied with their work.

Development for a Moving Service

“With Selleo, the entire development process was quite open and lean.”

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4.0

Quality: 
4.0
Schedule: 
5.0
Cost: 
4.0
Willing to refer: 
4.0
The Project
 
$50,000 to $199,999
 
Feb. - July 2017
Project summary: 

Selleo assisted with frontend and backend development for an online moving company’s digital system. They worked with Ruby on Rails and React.js technology to update the backend and make changes to the UI.

The Reviewer
 
201-500 Employees
 
Berlin, Germany
Dennis Gneuss
Chief Digital Officer, Movinga
 
Verified
The Review
Feedback summary: 

Selleo delivered a reliable product that’s still being used today. Compared to past experiences, the team stands out for their involved collaborative skills and seamless workflow. Overall, it was a transparent and productive engagement.

A Clutch analyst personally interviewed this client over the phone. Below is an edited transcript.

BACKGROUND

Introduce your business and what you do there.

I’m the chief digital officer of Movinga. We’re an online-based company that offers moving services and more to customers in Germany, France, and Sweden. I lead our technical product and design department.

OPPORTUNITY / CHALLENGE

What challenge were you trying to address with Selleo?

We wanted to quickly ramp up our development capabilities and fill some gaps in our system.

SOLUTION

What was the scope of their involvement?

They provided front-and backend development assistance alongside our internal team. We handled the conceptualization process and design elements in-house, and our project manager shared those requirements with the Selleo team. They implemented several UI changes on the frontend, working with Ruby on Rails and React.js. On the backend, the team helped us build logic into the grouping and dispatching system that’s used by internal agents working from desktop devices. They added a module to improve the backend system, which is also built with Ruby on Rails.

What is the team composition?

They assigned a frontend specialist, two developers, and a project manager to the project.

How did you come to work with Selleo?

Some of our internal staff had worked with them in the past, and they had good experiences. Based on that and their initial proposal, we chose to work with them for this project.

How much have you invested with them?

We spent between $50,000–$200,000.

What is the status of this engagement?

This project lasted from February–July 2017.

RESULTS & FEEDBACK

What evidence can you share that demonstrates the impact of the engagement?

They completed the development for the application, and it’s currently in use. We’ve worked with freelancers that weren’t that great in the past, but the collaboration with Selleo was pretty seamless. We didn’t run into any big hiccups because they were so well integrated into our team. We were very happy with their service.

How did Selleo perform from a project management standpoint?

Because he hired them to supplement our internal team, they didn’t have many project management responsibilities. Our team leads were in charge of scoping the work.

What did you find most impressive about them?

When we worked with other vendors, we had to go through several rounds of negotiations and back-and-forth discussions. It was a bit challenging. With Selleo, the entire development process was quite open and lean.

Are there any areas they could improve?

They provided developers from two different teams within their company, two from one team and one from the other. Selleo mentioned that they don’t normally split their resources that way, which I fully understand. They explained that they made an exception for our project because we specifically requested a frontend developer. We appreciated the accommodation, but the situation did create some limitations for us.

Any advice for potential customers?

Anyone considering Selleo should just send them an email.

4.0
Overall Score
  • 5.0 Scheduling
    ON TIME / DEADLINES
  • 4.0 Cost
    Value / within estimates
  • 4.0 Quality
    Service & deliverables
  • 4.0 NPS
    Willing to refer
    It depends on the type of project.

Software Development for Startup Venture Fund

“The products have minimal bugs, and I’m happy with the quality of their work.”

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4.5

Quality: 
4.0
Schedule: 
4.0
Cost: 
3.0
Willing to refer: 
5.0
The Project
 
$200,000 to $999,999
 
Apr. 2017 - Ongoing
Project summary: 

Selleo augments the existing dev team to work on various software projects. They’re currently building two web-based products, focusing on the frontend. They also provide support for the backend developers.

The Reviewer
Product Lead, Venture Fund
 
Verified
The Review
Feedback summary: 

Selleo is organized and communicative, maintaining regular contact to provide project updates. They’re trustworthy and eager to improve. They sometimes need technical guidance, but the team works well and wants to build the best products possible.

A Clutch analyst personally interviewed this client over the phone. Below is an edited transcript.

BACKGROUND

Introduce your business and what you do there.

I’m the product delivery lead for a venture investment organization. We deliver funding to startups and are also building a number of software and services to support our ambitions in the venture investment space. I work with the delivery teams to make sure our software meets project requirements.

OPPORTUNITY / CHALLENGE

What challenge were you trying to address with Selleo?

We needed a robust and sizable partner to augment our pre-existing dev team and work on various software projects and products.

SOLUTION

What was the scope of their involvement?

Right now, Selleo is building two web-based products. They use React to work on frontend development, and they also support our tech team who’s building the backend in Ruby on Rails.

What is the team composition?

They provide four full-time developers.

How did you come to work with Selleo?

We found them online. We narrowed it down to three firms, but Selleo had the best approach and was friendly, too. They were willing to discuss the project and make sure we all understood one another, so we hired them.

How much have you invested with them?

We’ve spent about £220,000 (approximately $279,880 USD).

What is the status of this engagement?

We’ve been partners since April 2017, and the work is ongoing.

RESULTS & FEEDBACK

What evidence can you share that demonstrates the impact of the engagement?

The products have minimal bugs, and I’m happy with the quality of their work.

How did Selleo perform from a project management standpoint?

We have weekly stand-up meetings to set expectations and go over progress. Even though they’re remote, they’ve engaged well with the project and have good communication. We use Google Meet and Trello to keep in touch.

What did you find most impressive about them?

They’re trustworthy and want the best for our organization. They’re eager for feedback and take it seriously, changing their workflow to meet expectations.

Are there any areas they could improve?

They sometimes need more oversight when it comes to implementing certain technology solutions.

Do you have any advice for future clients of theirs?

Treat them as part of your team and have regular communication. They work quickly, so make sure you have enough work to keep them busy.

4.5
Overall Score They’re a good addition to our team.
  • 4.0 Scheduling
    ON TIME / DEADLINES
    They communicate and set expectations well.
  • 3.0 Cost
    Value / within estimates
    They’re more cost effective than hiring individual developers.
  • 4.0 Quality
    Service & deliverables
    There’ve been a few bugs, but not too many.
  • 5.0 NPS
    Willing to refer
    I’d recommend them; they help get ideas off the ground quickly.

Web Development for VPN Service Provider

“Selleo is profoundly talented in the Ruby on Rails area.”

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5.0

Quality: 
5.0
Schedule: 
n/a
Cost: 
4.0
Willing to refer: 
5.0
The Project
 
Confidential
 
Jan. 2017 - July 2018
Project summary: 

Selleo provided development staff augmentation to help increase a VPN service provider’s pace and meet target deadlines. Based on a code review, they gave input and made updates to enhance the UX of the API.

The Reviewer
 
11-50 Employees
 
Berlin, Germany
Jörn Stampehl
CTO, ZenGuard
 
Verified
The Review
Feedback summary: 

Selleo offered insightful and actionable suggestions to enhance the website’s UX and overall quality. Drawing from an extensive knowledge base, the developers programmed clean, high caliber code. Pleasant, skilled, and accommodating, the team maintained a responsive and open dialogue.

A Clutch analyst personally interviewed this client over the phone. Below is an edited transcript.

BACKGROUND

Introduce your business and what you do there.

I’m the CTO and managing director of ZenGuard, a VPN service provider. Subscribing for a VPN on our website grants users the ability to connect to different locations in about 30 different countries. Once a user logs in, we provide full encryption for total web traffic.

OPPORTUNITY / CHALLENGE

What challenge were you trying to address with Selleo?

We had a shortage of resources, and It’s hard to find qualified developers in Berlin. Having worked with Selleo before, I knew they were fully capable of collaborating with our existing team. We needed them to look through our current code base and find methods to restructure and optimize it while fixing bugs they found along the way.  

SOLUTION

What was the scope of their involvement?

We hired Selleo as full-time developers. The team conducted an autonomous assessment of the existing code and proposed improvements. They enhanced the existing API to give users a better experience. Their involvement in several projects with our onsite team helped reach our timeline goals. 

All of the improvements Selleo made were on the coding side. They not only pinpointed areas that needed work but also implemented those updates. They worked onsite with our engineers on new development projects, as well.

What is the team composition? 

One of the developers from Selleo worked with us on a full-time basis. A more senior developer supported their work as a part-time resource.  He worked as a steering partner. After they discussed several issues, they recapped the takeaways with us to highlight what they felt we should improve.

How did you come to work with Selleo?

I had a great experience working with Selleo while employed at a different company, so I reached out to request help with this resource shortage. Sello is profoundly talented in the Ruby on Rails area.

What is the status of this engagement?

We worked together from January 2017–July 2018.

RESULTS & FEEDBACK

What evidence can you share that demonstrates the impact of the engagement?

Selleo wrote a very good quality of code. We were in close contact with the team’s management. If there were ever a problem, their managers would have been notified immediately. Luckily, no issues ever occurred. We were very satisfied with them.

How did Selleo perform from a project management standpoint?

We mostly managed Selleo’s resources internally. They made suggestions and waited for us to instruct them whether or not to instate them. Our communication was very direct. We used Slack.

They also took part in the weekly planning meeting via telephone conferences. Two or three times, they visited our office in Berlin to get to know the rest of our team and bond with them. They were directly bound to the project’s deadlines. 

What did you find most impressive about them?

Selleo has extensive knowledge of Ruby on Rails. They always assign a senior employee to consult their team during a project.

Are there any areas they could improve?

No. 

Do you have any advice for potential customers?

Bringing Selleo on site once or twice is very beneficial and allows them to meet the rest of your team. Maintain direct communication with them daily so that nothing gets lost in translation.

5.0
Overall Score I would work with them again.
  • N/A Scheduling
    ON TIME / DEADLINES
  • 4.0 Cost
    Value / within estimates
    They’re not the cheapest, but they offer a lot of value for your money.
  • 5.0 Quality
    Service & deliverables
    They are very knowledgeable. The quality of their work is also quite good.
  • 5.0 NPS
    Willing to refer
    They’re a team of really friendly people who are easy to talk to. It’s a pleasure to work with them. They provide a great service.

Frontend UI Dev for AdTech Firm

“They outperformed any other contractor we’ve worked with.”

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5.0

Quality: 
4.5
Schedule: 
4.5
Cost: 
5.0
Willing to refer: 
4.5
The Project
 
$50,000 to $199,999
 
2017 - 2018
Project summary: 

Selleo built the frontend UI in Triangular.js for an AdTech company. Working off of provided wireframes and designs, they augmented the in-house team and resolved architectural, CSS, and algorithmic issues.

The Reviewer
 
11-50 Employees
 
Berlin, Germany
Technical Product Manager, AdTech Firm
 
Verified
The Review
Feedback summary: 

Without Selleo’s support, the frontend UI would not exist. The functionality they implemented is reliable and communication throughout the collaboration was good. Though they worked remotely, their dedication matched that of the in-house team.

A Clutch analyst personally interviewed this client over the phone. Below is an edited transcript.

BACKGROUND

Introduce your business and what you do there.

We are a company in the AdTech space. I am the technical product manager leading the frontend and backend development.

OPPORTUNITY / CHALLENGE

What challenge were you trying to address with Selleo?

Selleo worked with us as a contractor for some of our frontend development needs.

SOLUTION

What was the scope of their involvement?

They collaborated with our in-house developers and built the frontend user interface for one of our products. The UI is built on Angular.js and was based on wireframes and designs we provided. The UI was based on our wireframes and design, to which Selleo suggested improvements throughout the development process.

We ran most of the project management on our side, while they operated as an external workforce. A junior developer concentrated on design-related tasks and CSS, while a senior developer worked on architectural and algorithmic problems.

What is the team composition?

We worked mostly with the two developers.

How did you come to work with Selleo?

The collaboration started before I joined the company. To my knowledge, we hired them for two previous contracts before this one.

How much have you invested with them?

The total spend was between 50,000 €–150,000 € (approximately $58,000–$174,000 USD).

What is the status of this engagement?

When I joined the company in February 2018, the project was already underway. We completed everything by August 2018, but will reach out to them again for future frontend projects.

RESULTS & FEEDBACK

What evidence can you share that demonstrates the impact of the engagement?

We wouldn't have a working frontend without them. The functionality and reliability of their work is solid. As with any agile development process, we identified bugs regularly and prioritized to solve the most significant ones.

How did Selleo perform from a project management standpoint?

Communication was smooth; most of our interactions were via Slack, Jira, and Google Sheets. We had daily meetings to coordinate the project and monthly retrospectives, in which we raised our concerns and found ways to collaborate more effectively.

What did you find most impressive about them?

Even though they were a remote contractor, they worked as if they were part of the in-house team. They outperformed any other contractor we’ve worked with, and their communication, dedication, and quality of work is second to none.

Are there any areas they could improve?

I can't think of any areas they should improve; they did a good job.

Do you have any advice for potential customers?

We used them primarily as an extension of our staff, but I know they do ad hoc projects as well. If you’re hiring them as an external workforce, communicate with them as much as possible to ensure your expectations align with their understanding of the project.

5.0
Overall Score
  • 4.5 Scheduling
    ON TIME / DEADLINES
  • 5.0 Cost
    Value / within estimates
  • 4.5 Quality
    Service & deliverables
  • 4.5 NPS
    Willing to refer
Verification

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Verification Level
Silver
VERIFIED
Business Entity
Business Entity Name
Selleo Sp Z.o.o
Status
Active
Jurisdiction of Formation
Poland
ID
0000452102
Date of Formation
Dec 13, 2005
Last Updated
Jan 30, 2019
Payment & Legal Filings
International Credit Risk Assessment

Per our methodology, the International Credit Risk Assessment rating is determined by our analysis of a credit report and third-party data.

Moderate Risk
Source
Creditsafe
Last Updated
Jun 26, 2019
Client Reviews
VERIFIED CLIENT REVIEWS
21
OVERALL REVIEW RATING
4.8
Source
Clutch
LAST UPDATED
April 29, 2020