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Senior Full-stack Devs: Supercharged by AI

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 (React, Node, React Native, Python, Ruby on Rails, EmberJS, Elixir).

Extend your in-house team

  • Min project size
    $10,000+
  • Hourly rate
    $25 - $49 / hr
  • Employees
    50 - 249
  • Locations
    Bielsko-Biała, Poland
  • Year founded
    Founded 2005
  • Languages
  • Timezones

1 Language that we service

  • English

1 Timezone that we service

CET
Central European Time (CET)

2 Locations

  • Bielsko-Biała , Poland
  • Bielsko-Biała , Poland

Select Focus Area
Application Platforms
Heroku
60%
Amazon Application Development Framework
30%
Other app platform
10%
Frameworks and CMS
Programming & Scripting
Ruby
40%
Typescript
5%
Industries
Business services
30%
Advertising & marketing
15%
Education
15%
Financial services
10%
Real estate
10%
Gaming
5%
Hospitality & leisure
5%
Information technology
5%
Medical
5%
Clients
Midmarket ($10M - $1B)
50%
Small Business (<$10M)
40%
Enterprise (>$1B)
10%

Pricing Snapshot

Min. project size $10,000+
Avg. hourly rate $25 - $49 /hr
Rating for cost 4.5 /5

What Clients Have Said

Selleo offers competitive pricing and high value for cost, often delivering projects within budget and on time. Clients report satisfaction with their responsiveness and quality, with budgets ranging from $20,000 to over $600,000, indicating flexibility in accommodating various project sizes.

This summary is based on verified Clutch reviews.

Most Common Project Size

$50,000 - $199,999 based on 24 reviews
< $49,999 $50,000 - $199,999 $200,000 - $999,999 > $1,000,000

Select a service to see pricing information

Selleo Review Insights

Overall Review Rating

4.8
  • Quality 4.6
  • Schedule 4.5
  • Cost 4.5
  • Willing to Refer 4.8

Top Mentions

Review Highlights

  • Expertise in Custom Software Development

    Selleo is highly praised for their proficiency in developing custom software solutions across various platforms, such as web, mobile, and SaaS. Clients from industries like finance, healthcare, and real estate commend their ability to tailor solutions to specific business needs.

  • Challenges with Timeliness in Some Projects

    While many clients report timely deliveries, a few have experienced delays. These instances suggest room for improvement in meeting deadlines consistently across all projects.

  • High-Quality Deliverables and Innovation

    Selleo consistently delivers high-quality products, often exceeding client expectations. Their focus on innovation and quality leads to successful project outcomes, with minimal bugs and reliable performance.

  • Exceptional Client Feedback and Satisfaction

    Overall, Selleo receives high praise from clients for their dedication, technical expertise, and ability to deliver exceptional results. Many clients express a strong willingness to continue working with Selleo.

  • Proactive and Solution-Oriented Approach

    Selleo is known for their proactive approach, offering valuable insights and suggestions to improve projects. Clients appreciate their willingness to explore new technologies and their dedication to continuous learning.

  • Attention to UX/UI Design

    Several reviews highlight Selleo's strong focus on UX/UI design, ensuring products are not only functional but also user-friendly and visually appealing. Their design expertise is a key factor in client satisfaction.

Selleo Reviews

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Services
Project Cost
Industry
Location

App Dev for Community & Social Organization

  • Web Development
  • $50,000 to $199,999
  • Jan. 2020 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

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

Apr 29, 2020
CEO, Better Off Social
Chris Mitchell
Verified
  • Arts, entertainment & music
  • New York City, New York
  • 1-10 Employees
  • Online Review
  • Verified

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

Development for a Property Management Platform

  • Custom Software Development
  • $200,000 to $999,999
  • Mar. 2017 - Ongoing
5.0
Quality
5.0
Schedule
4.5
Cost
4.5
Willing to Refer
5.0

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

Dec 4, 2019
CTO & Co-Founder, Breezeway
Nate Oaks
Verified
  • Other industries
  • Boston, Massachusetts
  • 11-50 Employees
  • Phone Interview
  • Verified

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.

Development for a Commerce Company

  • Custom Software Development
  • $200,000 to $999,999
  • June 2016 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

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

Aug 21, 2019
Founder, BrandActif
Anonymous
Verified
  • Other industries
  • United Kingdom
  • 1-10 Employees
  • Phone Interview
  • Verified

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.

Near-Shore Development Services for SaaS Collaboration Tool

  • Web Development
  • $200,000 to $999,999
  • Jan. 2015 - Ongoing
5.0
Quality
4.5
Schedule
4.5
Cost
4.5
Willing to Refer
5.0

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

Jul 30, 2019
Founder, 9TEAMS
Piet Neirinck
Verified
  • Other industries
  • Belgium
  • 1-10 Employees
  • Online Review
  • Verified

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. 

Development for an eSports Platform

  • Custom Software Development
  • $200,000 to $999,999
  • Jan. 2016 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

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

Feb 19, 2019
CPO, Battleriff Gaming AB
Tom Smith
Verified
  • Other industries
  • Sweden
  • 1-10 Employees
  • Phone Interview
  • Verified

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.

Development for a Startup Incubator

  • Custom Software Development
  • $50,000 to $199,999
  • Aug. 2018 - Ongoing
4.5
Quality
5.0
Schedule
5.0
Cost
4.5
Willing to Refer
4.5

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

Jan 18, 2019
Managing Director, WATTx
Anonymous
Verified
  • Other industries
  • Berlin, Germany
  • 11-50 Employees
  • Phone Interview
  • Verified

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.

Development for a Moving Service

  • Custom Software Development
  • $50,000 to $199,999
  • Feb. - July 2017
4.0
Quality
4.0
Schedule
5.0
Cost
4.0
Willing to Refer
4.0

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

Jan 16, 2019
Chief Digital Officer, Movinga
Dennis Gneuss
Verified
  • Other industries
  • Berlin, Germany
  • 201-500 Employees
  • Phone Interview
  • Verified

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.

Software Development for Startup Venture Fund

  • Custom Software Development
  • $200,000 to $999,999
  • Apr. 2017 - Ongoing
4.5
Quality
4.0
Schedule
4.0
Cost
3.0
Willing to Refer
5.0

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

Nov 27, 2018
Product Lead, Venture Fund
Anonymous
Verified
  • Financial services
  • Phone Interview
  • Verified

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.

Web Development for VPN Service Provider

  • Web Development
  • Confidential
  • Jan. 2017 - July 2018
5.0
Quality
5.0
Schedule
n/a
Cost
4.0
Willing to Refer
5.0

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

Oct 31, 2018
CTO, ZenGuard
Jörn Stampehl
Verified
  • Information technology
  • Berlin, Germany
  • 11-50 Employees
  • Phone Interview
  • Verified

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.

Frontend UI Dev for AdTech Firm

  • Web Development
  • $50,000 to $199,999
  • Jan. 2017 - Jan. 2018
5.0
Quality
4.5
Schedule
4.5
Cost
5.0
Willing to Refer
4.5

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

Oct 10, 2018
Technical Product Manager, AdTech Firm
Anonymous
Verified
  • Advertising & marketing
  • Berlin, Germany
  • 11-50 Employees
  • Phone Interview
  • Verified

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.

Showing 11-20 of 37 Reviews

Our Story

We are Selleo - a community of self-driven digital experts crafting secure, scalable software across SaaS, EdTech, HRM, fintech, healthcare and e‑commerce. Our team blends Ruby on Rails, React/React Native, Node, Python and mobile expertise with Management 3.0 principles: ownership, proactiveness, respect and teamwork.

Since our Rails origins we’ve grown into a 100+ strong, community‑engaged firm with ISO certifications and award‑winning culture, delivering dozens of successful projects.

Clutch verification provides an additional layer of data to help you make the right purchasing decision of business services.

Learn More
Verified Client Reviews
36
Overall Review Rating
4.8
Source
Clutch
Last Updated
April 24, 2026

Business Entity

Business Entity Name Selleo Labs Sp. z o.o.
Source Central Statistical Office of Poland
Jurisdiction of Formation Poland
Date of Formation October 13, 2021
Status Active
Last Updated July 8, 2025
ID 0000925982

Credit Report Results

International Credit Risk Assessment Low Risk
Source Creditsafe
Last Updated July 8, 2025
Learn More About The Clutch Verification Process

Locations (2)

Powstańców Śląskich 3 Bielsko-BiałaPoland 43-300

50 - 75

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