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Senior Fullstack Dev Teams | No Vendor Lock-in

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

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    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 clients noting strong value for cost. Projects ranged from $20,000 to over $600,000, depending on scope and duration. Clients praised their quality and responsiveness, indicating a good return on investment.

    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 UX/UI Design

      Selleo is recognized for its high-quality UX/UI design. Clients appreciate the aesthetic and functional design solutions that enhance user experience, with some projects receiving high ratings and positive user feedback.

    • Adaptability and Flexibility in Development

      Selleo demonstrates adaptability in handling changing requirements and scope. Clients appreciate their flexibility in development processes and their proactive approach to problem-solving and innovation.

    • Responsive and Supportive Post-Delivery Service

      Clients appreciate Selleo's post-delivery support, highlighting their availability and willingness to assist with further development and optimizations, ensuring long-term client satisfaction.

    • Challenges with Meeting Deadlines and Quality

      While generally praised, some clients have reported issues with Selleo's ability to meet deadlines and maintain quality standards consistently, leading to project delays and subpar deliverables.

    • Commitment to Client Success and Business Goals

      Selleo demonstrates a strong commitment to understanding and achieving client business goals. Their dedication to delivering solutions that align with client objectives is frequently highlighted in reviews.

    • Strong Cultural Fit and Team Collaboration

      Clients often note Selleo's cultural compatibility and seamless integration with in-house teams. Their collaborative approach and dedication to client success are highlighted as key strengths, making them feel like an extension of the client's team.

    Selleo Reviews

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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
    • Goeteborg, 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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