Software Development Company

Selleo

Polish software house building custom web and mobile products, with a focus on EdTech and HR tech

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TrustList summary

Selleo is a software development company founded in Poland in 2005 and still headquartered there. It builds web and mobile products for clients in Europe, North America and Australia. Its team now includes more than a hundred developers, designers and tech leads.

What Selleo does

Custom software development: full-stack builds from first prototype to scaling an existing product.
Team extension: developers who join a client's in-house team for a project.
Product strategy and design: shaping the idea before engineering starts.
AI-assisted delivery: coding assistants and AI app builders used in its workflow.
Specialist domains: learning platforms, HR systems, data analytics, advertising technology and business-process tools.

Key facts

Based in: Poland
Founded: 2005
Team: 100 or more people
Technologies: Ruby on Rails, React, React Native, Ember, Elixir

Summary written by TrustList from the business's own published information, Oct 2026.

Categories & features

Selleo rankings

Selleo is ranked on 3 TrustList rankings: #3 on 1, #10 on 1 and #30 on 1.

Every ranking orders its listings by their reviews, how complete the profile is and the Trust Score. Selleo has no reviews yet and 3 of the 10 profile details we look for. Where no listing on a page has been reviewed, the order follows the profiles alone.

Software development company · 3 rankings

#3of 47
Reactjs
It is one of 4 here listing IT outsourcing and outsourcing.
Of the 47 here, 76 also cover web development and 71 also cover AngularJS; 3 also work in Lviv and 2 also work in Ahmedabad.
Behind Virtueinfo, ahead of KTree Computer Solutions.
#10of 166
Poland
It is one of 7 here listing RubyonRails and one of 8 here listing mobile platforms.
Its profile: “Selleo is a software development company founded in Poland in 2005 and still headquartered there.”
Of the top 72 here, 41 also cover mobile app development and 36 also cover android; 4 also work in United States of America and 2 also work in Belarus.
Behind VAO, ahead of C&F.
#30of 125
Custom software development
It is one of 7 here listing ReactJS and one of 32 here listing iOS app.
Its profile: “- Custom software development: full-stack builds from first prototype to scaling an existing product.”
Of the top 70 here, 53 also cover software development and 51 also cover web design; 3 also work in Kyiv and 2 also work in Kharkiv, Ukraine.
Behind Logic Way.