Custom Web & Mobile Apps Development
Mobile App Development + Web Development + Custom Software Development
We build amazing apps from Argentina for startups all around the world. For five consecutive years (2018, 2019, 2020, 2021, 2022) XOOR has been selected by Clutch as one of the leading software development companies in Argentina and Latin America.
Some of the services we provide:
- Web apps development
- iOS app development
- Android app development
- PWA app development
- Infrastructure management on AWS
- UI/UX Design
- Team augmentation
We are passionate about web and mobile applications, but we are versatile professionals who adequate to all business requirements. We work from the South of the American continent to the rest of the world, with trust and transparency as our pillars.
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Focus
Portfolio
Boundary Digital, Grapevine.org, Omni.cr, CodersClan, Green Chilli Design, Lattus, Specialty Insurance Solutions, Aqqaint

Plantbase - Web Development
Development of backend and progressive web app for a platform that allows customers to find plant based product sellers

Indela - Web Development
Full development (front and back) of a platform for real estate management in the state of Los Angeles

Oribi - Web Development
Development of some marketing landing pages

Hilo - Web Development
We worked on the development of the frontend for a cryptocurrency related project.

OverOps - Website Development
We worked on several landing pages and updating existing web pages on the company main website. We also worked on ther blog and customer center websites

Plunge -Mobile App & Real Time Backend Development
Development of a backend system to analyse betting history data and race results to predict future race winners (horse, greyhounds and harness races in Australia, UK and US)
Reviews
the project
IT Staff Augmentation for Advertising Services Company
"They were proactive about improving the dynamics between both teams and were transparent about everything."
the reviewer
the review
The client submitted this review online.
Please describe your company and your position there.
I'm the VP of Product @ Jampp, a growth platform for mobile apps using programmatic advertising.
For what projects/services did your company hire XOOR Inc.?
Our product has many complexities both in terms of infrastructure and algorithms but also from the user experience in the platform. The user experience part was something that we were not paying enough attention because of lack of focus and resources so we hire Xoor to build an autonomous team to take care of our backlog and develop new functionalities in our roadmap.
How did you select this agency and what were the deciding factors?
We were looking for a company that shared our culture in terms of working dynamics (the profiles they hire, their transparency, etc) but more importantly we were looking for A TEAM, not just a bunch of developers... and I think Xoor provided that from day 1.
Describe the project in detail and walk through the stages of the project.
It's not a singular project but a whole part of our roadmap, regarding the user experience in our platform both for internal users and also customers accessing it. They are responsible for designing the solution, discussing it with other Jampp teams, developing it, releasing to production and, in some cases, even providing support.
Describe the recruitment process in detail.
We discussed our needs with them and based on that they provided a proposal plan with a set of candidates to choose from based on their fit for the challenge. We interviewed the candidates with complete freedom to evaluate their skills and experience and we moved forward.
Can you share any outcomes from the engagement that demonstrate progress or success?
We achieved many things. We remove A LOT of tech debt, we consolidated a legacy platform into our new one, we added several new features and we are now able to build and iterate faster thanks to all the knowledge that the team conquered.
How effective was the workflow between your team and theirs?
After around 2 weeks of onboarding (our product is a bit complex) they gained full autonomy on most of the decision making about what they are developing and they directly interact with other teams at Jampp when needed (dependencies, questions, etc). Both Xoor members and Jampp members use our Github repositories, we share Slack channels, etc.
What did you find most impressive or unique about this company?
The level of the people they hire is really good. They were proactive about improving the dynamics between both teams and were transparent about everything.
Are there any areas for improvement or something they could have done differently?
Apart from the usual challenges of a tech company finding and retaining talent, I don't think so.
the project
Custom Software Design & Development for Software Company
“XOOR Inc. brings an impressive level of customer service.”
the reviewer
the review
A Clutch analyst personally interviewed this client over the phone. Below is an edited transcript.
Introduce your business and what you do there.
I’m the director and chief product officer of a software company.
What challenge were you trying to address with XOOR Inc.?
We needed a company that could provide us with custom software development and design support.
What was the scope of their involvement?
I provide XOOR Inc. with the wireframes, requirements, and specifications, and they’re in charge of designing and building the applications to spec.
What is the team composition?
Over the years, we’ve worked with 7-8 people from XOOR Inc. This includes their founder, a partner, and their developers.
How did you come to work with XOOR Inc.?
I found XOOR Inc. through a Google search, and I decided they would be the best fit for us based on the initial work that I had done with their founder.
How much have you invested with them?
We’ve spent somewhere between $200,000-$250,000.
What is the status of this engagement?
We started working together in July 2017, and the engagement is ongoing.
What evidence can you share that demonstrates the impact of the engagement?
I’ve been quite happy with the work they’ve provided. They're very responsive and they stand behind their work.
How did XOOR Inc. perform from a project management standpoint?
We handle our project management internally. We primarily communicate through Slack and Zoom, where we have meetings every day.
What did you find most impressive about them?
XOOR Inc. brings an impressive level of customer service that a company their size might not always be able to bring. They stand behind their service even at their own expense, and ultimately, they deliver.
They have the ability to scale my team in a way that a larger agency would, but they still have the mentality of like a smaller, more custom agency, which I really like.
Are there any areas they could improve?
The time it takes for them to turn around certain deliverables depends on the individual we’re working with, so they haven't really been too consistent in that regard.
Do you have any advice for potential customers?
The clearer you are about your goals and the outcomes you want, the better XOOR Inc. will be able to help you.
the project
Mobile App Dev for Marketing Solutions Provider
"They try to better understand the tasks and come up with suggestions on their side that will improve them."
the reviewer
the review
The client submitted this review online.
Please describe your company and your position there.
I'm working as project manager for BigFiveEdition managing the development of the white label application BigCity App that will allow to geolocate an entity and events on the map with some social networking functionalities
For what projects/services did your company hire XOOR Inc., and what were your goals?
We wanted to Xoor to take over the project from another company and continue the develop of our mobile application finishing the already pending work and to work on new modules
How did you select this vendor and what were the deciding factors?
we searched online and checked their work on their website and asked for an intro call and assigned a small task to the tech lead. We have chosen Xoor because Max who worked on that task has well understood the task and finished it in the expected time with quality output.
Describe the scope of work in detail, including the project steps, key deliverables, and technologies used.
Optimizing the loading time of the application and developing new module that will allow users to get matched and chat with each other. Technologies used is React Native
How many resources from the vendor's team worked with you, and what were their positions?
1 senior react dev, 1 junior react dev and 1 laravel backend dev
Can you share any measurable outcomes of the project or general feedback about the deliverables?
I don't have this figures yet.
Describe their project management style, including communication tools and timeliness.
We were managing the project and we have recruited only the developers. But the management from Xoor is always available to resolve any issues if required and review with us the team.
What did you find most impressive or unique about this company?
They try to better understand the tasks and come up with suggestions on their side that will improve them. Also I appreciate how easily their senior dev get in to an already developed project.
Are there any areas for improvement or something they could have done differently?
Nothing in particular
the project
Product Dev, Design & UX for Software Company
"They genuinely care about the quality of work and how users interact with the product."
the reviewer
the review
The client submitted this review online.
Please describe your company and your position there.
I'm the co-founder of a software company, Harlow. Harlow is designed to help freelancers manage their day-to-day and get paid.
For what projects/services did your company hire XOOR Inc., and what were your goals?
As non-technical founders we were looking for a partner to help us build out the v1 of our product so we could take it to market and get customer feedback. We needed a partner that could help us with development, user experience & design and QA.
How did you select this vendor and what were the deciding factors?
We found Xoor through a referral, and after interviewing multiple firms we decided Xoor was the best fit for us. It was clear to us that they would be a highly collaborative partner and provide input along the way rather than just take a spec and implement it. Additionally, they had very solid references - their customers clearly love working with them.
Describe the scope of work in detail, including the project steps, key deliverables, and technologies used.
Xoor was with us every step of the way! We came to them with an overview of features that we wanted to develop & brand guidelines but there was a lot of discovery work and design work that still needed to happen. We started the project by digging deep into functionality and working through designs in figma.
Once we had a section complete, we would start development on that section. When all the core functionality was built, we opened the product up to beta testers so we could get additional feedback on usability and work through any bugs. One thing I really appreciated about the team is that during the beta period, they were genuinly interested in the feedback and eager to adjust parts of the app based on user input. They act as a true partner in the project rather than a vendor.
How many people from the vendor's team worked with you, and what were their positions?
The composition of the team has changed as we have moved through the project. Early on there was definitely some turnover on the team, but we finally settled into a good rhythm with a technical lead, a project manager and a designer. Once we had solid designs and moved to development, the designer moved to a different project and we brought on development and QA resources.
Can you share any measurable outcomes of the project or general feedback about the deliverables?
The product is just about to go live (to the general public) and within the timeframe we laid out at the beginning of the project. The feedback from users has been very positive, and people really love the clean UI and the ease of use.
Describe their project management style, including communication tools and timeliness.
We've been really happy with the project management. Our PM, Pilar, is absolutely fantastic. We have 2 very brief check in meetings a week and do the majority of our communication over slack. We have access to Jira so I can track tickets and development progress as much or as little as I want. The team is very responsive and the slight time difference between us (4 hours) works to our advantage.
What did you find most impressive or unique about this company?
As I mentioned above, I think the best part about working with Xoor has been that it really does feel like a partnership rather than a vendor relationship. They genuinely care about the quality of work and how users interact with the product.
Are there any areas for improvement or something they could have done differently?
There was some turnover on the team in the beginning and I wish they would have been a little more proactive abut discussing it with us, but in the long run it didn't delay the project or have a material impact on things.
the project
Progress Web Application Dev for Software Service Company
“They have a diverse background and decades of experience, from front- and backend development to design.”
the reviewer
the review
A Clutch analyst personally interviewed this client over the phone. Below is an edited transcript.
Introduce your business and what you do there.
I’m the founder and CEO of Lattus, a Delaware-based SaaS company that serves businesses, schools, and member groups. Lattus is all about mentoring people.
What challenge were you trying to address with XOOR, Inc.?
I needed help making my mentoring software product better.
What was the scope of their involvement?
XOOR, Inc. has taken my existing mentorship product and built it out. It’s a fully progressive web application (PWA) that’s accessible on multiple devices. They leverage Node.js as well as React Native to develop the app and host it on AWS.
The solution itself has four key components. The first is a way to identify topics that mentees and mentors want to talk about. Next, users can check other users’ availability and schedule calls through an integrated calendar. Built-in video calling capabilities eliminate the need for external communication services. Finally, users can take notes and give feedback. All of these components make the app a one-stop-shop for mentoring.
What is the team composition?
I work with many people, including Mauricio (CEO), Jonatan (CTO), Robby (Chief Business Development Officer), and Kurt (Chief Creative Officer).
How did you come to work with XOOR, Inc.?
I’d worked with some of XOOR, Inc.’s competitors in the past and was unpleased with the quality of the services — those experiences taught me a lot about what I didn’t like in partnerships. Then, I spoke with one of XOOR, Inc.’s customers who referred me to them. After talking to their team for a few months, I decided to work with them.
How much have you invested with them?
I’ve invested about $150,000 so far, and there’s probably another $500,000 coming their way.
What is the status of this engagement?
The project started in July 2020 and is still ongoing. I plan to work with them on our iOS and Android apps by end of this year.
What evidence can you share that demonstrates the impact of the engagement?
Overall, I’m pleased with the product. Its functionality has continuously improved over time, and we’re able to grow the business with our product’s capabilities. Now that we’ve developed a better platform, we can sell it to customers and increase its usage to start generating revenue. This will also help us raise capital from investors.
How did XOOR, Inc. perform from a project management standpoint?
We use Jira to manage the project, Slack for general communication, and either Google Hangouts or Zoom for recurring video calls. As a strategic part, we also use Lattus to collaborate, which helps us improve our own product.
What did you find most impressive about them?
It’s important to mention that they have a diverse background and decades of experience, from front- and backend development to design. They’ve even worked within the public and private sectors. That multinational diversity of personalities is not something that you’d typically get from your typical development shop. It’s a breath of fresh air.
Are there any areas they could improve?
No, I only have great things to say about them. I enjoy them more and more as I meet their team, and our relationship continues to improve.
Do you have any advice for potential customers?
Have your product requirements flushed out beforehand, including preliminary sketches, user stores, and user personas. They can help you mature your specs, but they need to understand what you’re trying to accomplish.
You also need to make sure that you’re serious about the work because they don’t just accept anyone who wants to give them money. They’ve often turned down clients because of the quality of their output, and I respect them for that.
the project
Web Platform & App Dev for Art Marketplace
"I’m most impressed by their commitment and knowledge of how startups work."
the reviewer
the review
A Clutch analyst personally interviewed this client over the phone. Below is an edited transcript.
Introduce your business and what you do there
I’m co-founder and COO of an arts marketplace. The marketplace aims to connect artists and fine art printers with art lovers.
What challenges were you trying to address with XOOR Inc.?
We needed a partner to build our marketplace’s web and mobile platforms. It was a challenge because the platforms had to handle digital and physical goods.
What was the scope of their involvement?
XOOR developed our marketplace’s web platform and web app. As there wasn’t an existing solution that managed bundled products, their team built a completely customized solution. The platforms are available worldwide.
What is the team composition?
We worked with a project manager and three developers.
How did you come to work with XOOR Inc.?
We conducted research online and found XOOR on Clutch. Along with other companies, we contacted them. They best fit our requirements for cost, flexibility, and commitment.
How much have you invested in them?
We’ve spent between $75,000–$100,000 on this project
What is the status of this engagement?
We started working with XOOR in June 2020, and we’re now working on adjustments.
What evidence can you share that demonstrates the impact of the engagement?
It’s been a great project. XOOR knows how to work with startups and thinks long-term. That thought process allowed us to save on costs. Their team shows great commitment too. Rather than just executing the project, they constantly give us new ideas. XOOR is an extension of our team.
How did XOOR Inc. perform from a project management standpoint?
We mainly use Slack to communicate. They’re great at managing the project. Although there were slight delays due to the COVID-19 pandemic, they have always been flexible. Their team also communicates well.
What did you find most impressive about them?
I’m most impressed by their commitment and knowledge of how startups work.
Are there any areas they could improve?
No, I can’t think of ways they could improve.
the project
Mobile App Development for COVID-19 Detection Startup
“They went beyond the extra mile and thought of things that I hadn’t even considered.”
the reviewer
the review
A Clutch analyst personally interviewed this client over the phone. Below is an edited transcript.
Introduce your business and what you do there.
I’m the CEO at Virufy, a nonprofit. We’re developing an app that allows users to detect COVID through sound recordings of their cough. The sound of a COVID-positive person’s cough is different because the virus affects the lungs. Our app will use AI to analyze cough recordings.
What challenge were you trying to address with XOOR Inc.?
We needed to build a mobile app.
What was the scope of their involvement?
XOOR Inc. used React to build out our mobile app. The idea is that users will donate their cough recordings so that we can build our dataset. Eventually, the app will provide COVID detection predictions.
They built the app, and we’re now enhancing it for the next stage. We’re planning to go global, so we have a lot of target countries.
What is the team composition?
I work directly with Jonatan (CTO), and he’s been leading about five people behind the scenes. I’ve met a couple of their engineers.
How did you come to work with XOOR Inc.?
The speed at which they move really matches us as a startup.
How much have you invested with them?
They offered the services to us pro bono.
What is the status of this engagement?
Our work together began in September 2020, and we’re still working together.
What evidence can you share that demonstrates the impact of the engagement?
XOOR was a great partner in building out our app. We couldn’t have done this without them. I’d previously tried to build the app with student volunteers, but it’s harder than it seems if you want a reliable, robust app that complies with security and legal compliance. XOOR delivered a solid system that is scalable to millions of users, and I’m really appreciative of that.
How did XOOR Inc. perform from a project management standpoint?
They’re very good at communicating and meeting deadlines. They’re very reliable, and they do good, quality work. Jonatan is a great project manager; he acts as a gateway, so I don’t have to work with the developers directly. He’s always willing to make time when needed.
They’re really good in HTML and CSS. They’re also well-versed in the tools many people use in Silicon Valley, like Slack and Trello.
What did you find most impressive about them?
They went beyond the extra mile and thought of things that I hadn’t even considered. For instance, they have empathy for and understand the Latin American market, and they recommended designing the screens in certain ways. In general, everything else about the engagement is really good.
Are there any areas they could improve?
They’re really good at communicating. Sometimes, it seems like they over-communicate, but that’s actually important for the app in the long-term. If we don’t talk it out, we might miss something.
the project
Custom Software Development for Digital Asset Management
"Great team to work with."
the reviewer
the review
The client submitted this review online.
Please describe your company and your position there.
CEO and the lead developer.
For what projects/services did your company hire XOOR Inc., and what were your goals?
We have a complex software application that integrates with numerous downstream services (financial systems, accounting systems, and more). We needed support for our engineering teams, and needed a hard working team that could be self directed.
How did you select XOOR Inc. and what were the deciding factors?
We were referred by a previous customer, and we liked the team. We also gave them a difficult technical interview that the team members did very well at.
Describe the scope of work in detail, including the project steps, key deliverables, and technologies used.
Our stack is node.js with Typescript on the backend and Vue on the front end. XOOR was able to support the full stack, and even helped us with building out a full set of APIs for our application.
How many people from the vendor's team worked with you, and what were their positions?
We worked with two developers at XOOR who were both attentive, responsive, intelligent, and self directed. Being able to get rolling on tasks without a lot of involvement from our team was a big deal to us, and they stepped up to the challenge!
Can you share any measurable outcomes of the project or general feedback about the deliverables?
Our application has grown and we've added new users, and have in general been doing well as a startup with the help of XOOR.
Describe their project management style, including communication tools and timelines.
XOOR was very flexible, we use Gitlab and they were able to jump right in with our ticketing and agile systems.
What did you find most impressive or unique about this company?
Everyone was super friendly, and it was fun getting to know people from a different part of the world during the pandemic.
Are there any areas for improvement or something they could have done differently?
Nothing of note. Great team to work with
the project
Platform Development for App Growth Platform
"XOOR was very engaged with our project and had many innovative ideas."
the reviewer
the review
A Clutch analyst personally interviewed this client over the phone. Below is an edited transcript.
Introduce your business and what you do there.
I am a product manager at an app growth platform offering global services.
What challenges were you trying to address with XOOR?
We needed a partner to create an invoicing solution for us.
What was the scope of their involvement?
XOOR developed an invoicing platform for us. We had different invoicing processes for our different global invoicing entities and were looking to automate and unify our processes. They used JavaScript, SQL, and React Native.
What is the team composition?
We worked with 4 to 5 people.
How did you come to work with XOOR?
I started a web search on agencies in Argentina that could do this development for us, and I found XOOR on Clutch. They have very good references so they seemed like a good choice for us.
How much have you invested in them?
We spent about $30,000.
What is the status of this engagement?
We started working with them in January 2020 and the project lasted about 6 months.
What evidence can you share that demonstrates the impact of the engagement?
The quality of the platform is great; we’ve tested it several times and it works just perfectly. Whenever we encountered any setbacks they were there to solve problems.
The impact on our company has also been great. This used to be a manual process and required a very large amount of time and human resources — with the platform, we have saved a lot of time and resources.
How did XOOR perform from a project management standpoint?
We used Slack to communicate, as well as Zoom and Google Meet. We used a Gantt diagram for project management and everything went very well. They were very flexible and we achieved very good results.
What did you find most impressive about them?
They were always pending on every detail, and the quality of their work is just great. XOOR was very engaged with our project and had many innovative ideas.
Are there any areas they could improve?
The conclusion of the project lasted a bit longer than it was initially expected, it wasn’t a big issue and was a natural consequence of changes but maybe they could do a more precise estimation of the length of the projects.
the project
Web Development for IoT Company
“They met our expectations even when there were changes to the scope.”
the reviewer
the review
A Clutch analyst personally interviewed this client over the phone. Below is an edited transcript.
Introduce your business and what you do there
I’m the CTO at a development company specialized in IoT.
What challenges were you trying to address with Xoor?
We developed a new product that required a mobile app for its use. We created the hardware, the product itself, and needed to outsource the development of the mobile app.
What was the scope of their involvement?
They used React Native to create our app. The team created both iOS and Android versions.
What is the team composition?
Three people worked with us since the ideation of the project and during the development, another 3–4 people were involved.
How did you come to work with Xoor?
They are based in the same city as us so I heard about them in the local technology scene. They seemed good for this project so we met up with them, we really liked their proposal so we decided to work with them.
What is the status of this engagement?
We started working with them in December 2019, and our work is ongoing with the final details of the app.
What evidence can you share that demonstrates the impact of the engagement?
The general results of the project are very good, we are even planning to continue with a second phase for this app and later on to work in a web app. They met our expectations even when there were changes the scope; the team was able to adapt perfectly.
How did Xoor perform from a project management standpoint?
They adapted to our own project management tools, we used slack for communications and everything was very fluid. We also met in person a couple of times and the team was very timely.
What did you find most impressive about them?
I am pretty happy with the results, so I couldn’t say anything.
As a result of collaboration with XOOR Inc., the company achieved their goals — they successfully removed tech debt, consolidated a platform into a new one, and added new features. A proactive and transparent partner, the team interfaced directly with in-house developers using GitHub and Slack.