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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

  • 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.

  • 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.

  • Cultural Fit and Team Integration

    Clients value Selleo's cultural alignment and their ability to integrate seamlessly with in-house teams. They are seen as more than just a vendor, often becoming an extension of the client's team and contributing to long-term success.

  • 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
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Industry
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Web Development for Business Consultancy

  • Web Development
  • Confidential
  • May 2016 - Ongoing
4.5
Quality
4.0
Schedule
4.5
Cost
4.0
Willing to Refer
4.5

“They’re interested in our feedback, proactively finding ways to improve.”

Sep 14, 2018
CTO, International Business Consultancy
Anonymous
Verified
  • Advertising & marketing
  • Berlin, Germany
  • 51-200 Employees
  • Online Review
  • Verified

Joining the internal team, Selleo writes and reviews code, and provides suggestions that guide the product’s technical architecture, implementation strategies, and development processes on an ongoing basis.

Software and Web Development for Employment Platform

  • Custom Software Development
  • $200,000 to $999,999
  • Dec. 2016 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
4.0
Willing to Refer
5.0

“We’re really happy to give them free rein to follow their instincts when solving things.”

Jan 15, 2018
CTO, Studentvikarie
Henrik Lindberg
Verified
  • Education
  • Gothenburg, Sweden
  • 51-200 Employees
  • Phone Interview
  • Verified

Selleo worked on the development of a web application, building the platform’s second version from scratch. The work used Ruby on Rails and React for the frontend, as well as HTML, CSS, and JavaScript.

Mobile App Development for Greeting Card Company

  • Mobile App Development
  • $10,000 to $49,999
  • May 2017 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

“They have a great deal of empathy for what we’re trying to accomplish and for a startup, that’s important.”

Dec 7, 2017
CEO, Documobi
Peter Lancaster
Verified
  • Other industries
  • Harrogate, England
  • 1-10 Employees
  • Phone Interview
  • Verified

Selleo developed an iOS and Android mobile app using Apache Cordova. They used an existing backend infrastructure using Ruby on Rails, and offered additional security for the app's use in financial services.

Web App for Health Services Company

  • Web Development
  • Confidential
  • Dec. 2015 - June 2017
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

“I’ve been quite impressed with Selleo’s work — they built a beautiful product with outstanding code.”

Jun 30, 2017
Senior Software Engineer, Hospital & Healthcare Company
Anonymous
Verified
  • Other industries
  • New Jersey, United States
  • 201-500 Employees
  • Phone Interview
  • Verified

Selleo is developing a communication app that allows doctors to collaborate on cardiovascular cases while following HIPAA standards. The team continues to test and optimize the app, except for the iOS version.

Rails Development for Payment Solutions Company

  • Web Development
  • $10,000 to $49,999
  • Dec. 2016 - Ongoing
5.0
Quality
4.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"I was very impressed with the quality of the frontend work they did, their professionalism, and their organization."

Jun 30, 2017
CTO, Payment Card Solutions
Rob Anderson
Verified
  • Financial services
  • London, England
  • 1-10 Employees
  • Phone Interview
  • Verified

Selleo helped maintain a large code base, and helped build new systems on Ruby on Rails. They incorporated HTML, improved security and reliability, and also contributed some frontend and graphic design work.

e-Commerce Development for Online Apparel Company

  • E-Commerce Development
  • $200,000 to $999,999
  • Sep. 2016 - Ongoing
5.0
Quality
5.0
Schedule
4.5
Cost
5.0
Willing to Refer
5.0

"Selleo has certainly contributed to our recognition as a market leader."

Jun 29, 2017
COO, SquadLocker
Keith Roberts
Verified
  • Retail
  • Warwick, Rhode Island
  • 11-50 Employees
  • Phone Interview
  • Verified

Selleo provides full-stack development for a sports gear e-commerce platform, customizing store-building, promotional, and purchasing functionalities to ensure an efficient UX/UI in an expanding partnership.

Web Development for Real Estate Company

  • Web Development
  • $50,000 to $199,999
  • Aug. 2016 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
4.5
Willing to Refer
5.0

"They’ve been very receptive to using our tools and offer valuable opinions."

Jun 27, 2017
CTO, Private Equity Real Estate Firm
Mike Miklavic
Verified
  • Real estate
  • Boston, Massachusetts
  • 11-50 Employees
  • Phone Interview
  • Verified

Selleo conducts full-stack Ruby on Rails development across multiple web applications, streamlining real estate data and creating internal/public-facing platforms to support investment strategies. 

Development for SaaS Learning Platform

  • Web Development
  • $50,000 to $199,999
  • Jan. - Dec. 2016
5.0
Quality
4.5
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"They delivered to the highest level of quality."

Jun 7, 2017
Founder, SaaS Learning Platform
Anonymous
Verified
  • Other industries
  • New York City, New York
  • 11-50 Employees
  • Phone Interview
  • Verified

Selleo developed web app features on multiple platforms to support content management and e-learning design, providing 3–5 engineering resources to augment the internal team.

Custom Development for e-Learning Company

  • Custom Software Development
  • Confidential
4.5
Quality
5.0
Schedule
4.5
Cost
5.0
Willing to Refer
5.0

"What sets Selleo apart is the enthusiasm and care taken on the project beyond scope."

Jun 4, 2017
CEO, Neutopia
Jamie Engel
Verified
  • Education
  • Sydney, Australia
  • 1-10 Employees
  • Online Review
  • Verified

Selleo provided frontend and backend development, as well as design and technical support, for an engaging e-learning software project. Additional features include playlists and Pinterest-esque posting.

Conference Management Platform for Training Company

  • Web Development
  • $10,000 to $49,999
  • Feb. 2014 - Mar. 2015
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"[W]ith Selleo’s professional approach, the work was easy and even enjoyable."

May 23, 2017
Vice Chairman of Advisory Board, Training Company
Anonymous
Verified
  • Other industries
  • Warsaw, Poland
  • 1-10 Employees
  • Online Review
  • Verified

Selleo developed an event-focused web CMS solution with corresponding mobile apps (iOS, Android, and Windows Phone), incorporating user behavior analytics and feedback features to boost participation.

Showing 21-30 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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