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Colin HaagCH

Colin Haag

Fullstack Developer

€350/day
Düsseldorf, DE
0-2 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Colin

Are you looking for a fullstack developer who reliably implements both backend and web and mobile frontends?
I develop scalable backends withSpring Bootand connect them with modern frontends inReact, Angular(Web) andReact Native(Mobile Apps) – all from a single source.

How I can specifically support you:

Development of robustREST APIs and Microservices

Implementation of performant web applications with React

Development of cross-platform mobile apps with React Native

Connection of databases (PostgreSQL, MySQL, MongoDB)

Modern interfaces with OpenAPI

What sets me apart:

Full project execution: fromplanningthroughdevelopmentto delivery

Clear communication and binding agreements

Technical focus on stability, maintainability, and scalability

Typical projects:

Backend & Mobile App for Startups

Web interfaces for internal tools

API development and integration of external services

Goal: Clear solutions for real problems – without detours.
  • German

    Native or bilingual

  • English

    Fluent

Can work on-site
Düsseldorf (up to 50km)

Experience

  • ARAG
    Software Developer
    January 2025 - Today (1 year and 5 months)
    My task is to create microservices and UIs. I use Spring Boot, Java, OpenAPI, Angular, and more!

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