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George KosmopoulosGK

George Kosmopoulos

Fractional CTO/Senior Full-Stack Developer

€650/day
Brussels, BE
8-15 years

Average response time: 1 hour

About George

I help startups, scale-ups, and EU institutional consultancies build and improve web applications and mobile products. With 8+ years of professional development experience and having taught 500+ developers at Le Wagon Brussels, I bring both deep technical expertise and the ability to communicate clearly with non-technical stakeholders.

My specialties: Ruby on Rails applications (new builds and legacy modernization), React/React-Native mobile apps, AI/LLM integration into existing products, and EU institutional compliance systems. I've worked at Thoughtbot (best practices in Rails), Cowboy (mobility tech), and built tender automation systems for EU communication agencies.

I'm available for focused missions of 2-5 days/week alongside my current role. I work in English, French, German, and Greek. Based in Brussels, available on-site or remote. I deliver clean, tested code and communicate proactively — no surprises.
  • English

    Native or bilingual

  • French

    Native or bilingual

Can work on-site
Brussels (up to 50km), Bruxelles (up to 40km)

Experience

  • Cowboy
    Software Engineer
    May 2025 - Today (1 year and 1 month)
    Handle the infrastructure/backend of the client apps for their bikes as well as writing/maintaining the features of the in-house apps
  • Nodalview
    Confirmed Web Engineer
    September 2024 - May 2025 (8 months)
    Brussels, Belgium
    Backend engineer for an app that does pictures enhancing/transformation for real-estate agents. It was a good experience and practice for my infra skills.
  • Nakyma
    creator
    September 2024 - Today (1 year and 9 months)
    I created a mobile app for self-development. I keep on improving it -
    It's a free app that I do not get money out off but that keeps me on my toes

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Education

  • Bac Informatique de Gestion
    ISFCE
    2017
  • Alumni LeWagon
    LeWagon
    2016

Skill set

Categories