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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%
Certified in:
Custom Software Development React

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 with strong value for cost, frequently delivering high-quality solutions within client budgets. Projects ranged from $20,000 to $600,000, with teams of 2 to 15 members, reflecting flexibility and a commitment to client needs.

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

  • Exceptional Client Feedback and Industry Recognition

    Selleo's work has received positive feedback from both clients and industry peers, with some projects earning high ratings and recognition for their quality and innovation.

  • Effective Project Management and Communication

    Most clients commend Selleo for their organized project management and clear communication. They use Agile methodologies, maintain regular meetings, and ensure transparency, which helps them meet deadlines and adapt to client needs.

  • Room for Improvement in Quality Assurance

    Some clients suggest improvements in Selleo's quality assurance processes, specifically in feature checks and bug testing before delivery. This indicates a potential area for Selleo to enhance service quality.

  • Positive Experiences with Team Integration

    Clients appreciate Selleo's ability to integrate seamlessly with internal teams, forming a cohesive unit that enhances productivity and project success.

  • Impressive Responsiveness and Flexibility

    Selleo is noted for its responsiveness and adaptability. Clients appreciate their willingness to adjust to changing requirements and provide ongoing support and collaboration, making them a reliable partner.

  • High-Quality Deliverables and Client Satisfaction

    Clients report high satisfaction with Selleo's deliverables, noting that the solutions are well-crafted, innovative, and meet or exceed expectations. This has led to successful product launches and positive feedback from end-users.

Selleo Reviews

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Services
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Frontend UI Dev for AdTech Firm

  • Web Development
  • Angular
  • $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.

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
  • Ruby on Rails HTML5 JavaScript Ruby React
  • $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
  • Ruby on Rails Android App Development iPhone iOS App Development Hybrid & cross platform apps
  • $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
  • Ruby on Rails Ruby React
  • 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
  • Ruby on Rails HTML5 Ruby
  • $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
  • Other ecommerce systems
  • $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
  • Ruby on Rails React
  • $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
  • Heroku Ruby on Rails JavaScript Ruby SQL
  • $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.

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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