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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

    • Positive Client Feedback and Successful Outcomes

      Clients report successful project outcomes, such as increased user engagement, streamlined operations, and enhanced product functionality. Selleo's work often leads to positive feedback from end-users and stakeholders.

    • High-Quality Code and Development Standards

      Clients consistently praise Selleo for delivering high-quality, reliable, and well-documented code. Their adherence to development standards and practices ensures robust and maintainable solutions.

    • 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.

    • 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.

    • Proactive in Offering Constructive Feedback

      Selleo is proactive in providing constructive feedback and suggestions, which clients find valuable for improving project outcomes and overall development processes.

    • 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.

    Selleo Reviews

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    MVP Development & UX/UI Design for Web-Based Educational Co

    • Custom Software Development UX/UI Design
    • Confidential
    • Sep. 2025 - Ongoing
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "What stands out about Selleo is the level of ownership the team takes."

    Mar 27, 2026
    Founder, Emany
    Martin Nymann
    • Education
    • Copenhagen, Denmark
    • 1-10 Employees
    • Online Review

    Selleo has assessed, estimated, and structured an MVP roadmap for a web-based educational company. The team has designed the UX/UI, built a prototype to validate its market fit, and developed the platform.

    Web App Development for Business Services Company

    • Web Development
    • Confidential
    • June 2025 - Ongoing
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "Their capacity to understand our business needs and convert those into developments is impressive."

    Dec 22, 2025
    Co-Founder, Business Services Company
    Anonymous
    Verified
    • Business services
    • Luxembourg
    • 1-10 Employees
    • Online Review
    • Verified

    Selleo has developed a web app for a business services company. The team has built the platform from scratch, implementing custom features and conducting testing and deployment support.

    Custom Software Development for FinTech Company

    • Custom Software Development IT Staff Augmentation Web Development
    • Confidential
    • Jan. 2019 - Nov. 2024
    5.0
    Quality
    4.5
    Schedule
    4.5
    Cost
    5.0
    Willing to Refer
    5.0
    "Selleo doesn't rush to get something done; they get it done correctly."
    Nov 22, 2023
    VP of Product, FinTech Company
    Frank Conway
    Verified
    • Other industries
    • Allentown, Pennsylvania
    • 1,001-5,000 Employees
    • Online Review
    • Verified

    A fintech company has hired Selleo to develop a self-service kiosk for sports and entertainment venues and a web admin portal for merchants. The team works on front- and backend development.

    SaaS Platform Revamp for Healthcare Company

    • Custom Software Development
    • Confidential
    • Jan. - Aug. 2023
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "They are very agile, flexible, and accommodating to our needs."

    Aug 25, 2023
    President & CEO, Healthcare Company
    Anonymous
    Verified
    • Other industries
    • Newark, New Jersey
    • 11-50 Employees
    • Online Review
    • Verified

    A healthcare company partnered with Selleo to revamp their existing SaaS platform within a specific budget. The team was tasked with redesigning the platform's UI/UX and expanding its functionality.

    App Design for App Development Company

    • Custom Software Development
    • $10,000 to $49,999
    • Jan. 2021 - Jan. 2022
    0.5
    Quality
    0.5
    Schedule
    0.5
    Cost
    0.5
    Willing to Refer
    0.5

    "The end result was terrible."

    Jan 9, 2023
    Co-Founder, App Development Company
    Anonymous
    Verified
    • Other industries
    • Sydney, Australia
    • 11-50 Employees
    • Online Review
    • Verified

    Selleo redesigned an app for an app development company. They were tasked with recreating widgets and designing the UX.

    Financial App Development for Fintech Company

    • IT Staff Augmentation Mobile App Development
    • $50,000 to $199,999
    • May 2021 - Ongoing
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    3.5
    Willing to Refer
    5.0

    "The team is fully integrated into our own workflows and processes."

    Aug 8, 2022
    Co-Founder, Fintech Company
    Anonymous
    Verified
    • Financial services
    • Wilmington, Delaware
    • 11-50 Employees
    • Online Review
    • Verified

    A fintech company was looking to enhance their frontend capabilities for their financing software, so they engaged with Selleo to supplement their staff of mobile app developers.

    SaaS Dev. for a Software Provider

    • Custom Software Development
    • $50,000 to $199,999
    • June 2017 - Ongoing
    4.5
    Quality
    4.0
    Schedule
    5.0
    Cost
    4.0
    Willing to Refer
    4.0

    “We can now ship our products faster and demonstrate our ability to execute quickly.”

    Jul 31, 2018
    CTO, Alyne
    Manuel Reil
    Verified
    • Information technology
    • Germany
    • 11-50 Employees
    • Online Review
    • Verified

    Selleo provided expertise on improving the framework for a SaaS solution. This included providing insight on API and UI.

    Showing 31-37 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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