Full Stack Developer (Freelance)

Stellenbeschreibung:

Your mission

We are looking for an experienced Full Stack Developer (Freelance) to join our team for a 3-month project focused on developing and extending web applications , including the integration of AI/ML capabilities.

This role is ideal for a midlevel freelancer comfortable working across the entire tech stack, with hands‑on experience in AI/ML integrations and modern software development practices.

  • Design, develop, and advance full‑stack web applications within our modern technology stack, which also includes:
    • Adding new features to our proprietary web‑based chat messenger to make human text interaction more personal, accessible, robust, and secure.
    • Improving counseling quality and efficiency by integrating new tools into the platform that help with routine tasks of the psychosocial counseling team.
  • Implement responsive user interfaces based on design specifications in close collaboration with designers and stakeholders.
  • Design and build robust backend APIs, including AI/ML services and integrate them into existing systems.
  • Support the deployment, monitoring, and ongoing optimization of our applications.
  • Write clean, testable and maintainable code for both frontend and backend systems.
  • Optional: Actively contribute to the development of new AI/ML‑based product features.

Your profile

  • Degree in Computer Science, Software Engineering, or equivalent professional experience.
  • 4+ years of experience as a full‑stack developer.
  • Strong knowledge of modern frontend and backend development, including Typescript, HTML, CSS, and responsive design.
  • Hands‑on experience with API design and integration.
  • Proficiency in Git version control.
  • Basic knowledge of databases and scripting.
  • Strong problem‑solving skills and ability to work both independently and in a team.
  • Excellent communication skills in English.
  • Experience with working in agile environments.
  • Familiarity with using LLM‑based code‑assist tools in day‑to‑day work for improved DX.
  • Optional : Familiarity with machine learning concepts and libraries + Basic knowledge of Python.
  • Nice to have: Experience with building AI solutions.

Why us?

  • Be part of a mission‑driven organization making a real difference in people's lives.
  • Work in a supportive and collaborative environment with opportunities for growth and development.
  • Note : A long‑term collaboration may be possible following the initial 3‑month engagement depending on future fundings.

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EnglishEN: Please refer to Fuchsjobs for the source of your application
DeutschDE: Bitte erwähne Fuchsjobs, als Quelle Deiner Bewerbung

Stelleninformationen

  • Typ:

    Vollzeit
  • Arbeitsmodell:

    Vor Ort
  • Kategorie:

  • Erfahrung:

    2+ years
  • Arbeitsverhältnis:

    Angestellt
  • Veröffentlichungsdatum:

    05 Nov 2025
  • Standort:

    Berlin

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