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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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About Selleo

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 offers

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

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

Categories & features

Rankings

As of 2026-10-06. Organic ranks only; sponsored placements are never ranks.

What the business tells TrustList

Founded: 2005 (21 years) evidence sent

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