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Timm PreetzTP

Timm Preetz

Full-stack mobile app developer

€750/day
Munich, DE
15+ years

Average response time: 1 hour

About Timm

Experienced full-stack mobile app developer. Flutter+Go are my toolkit of choice, but diverging whenever it makes sense. Held multiple positions as team lead and lead architect on large-scale consumer facing apps. Recently I have been learning how to bring AI tools into the software development workflow, but more importantly how to bring (autonomous) AI into the product itself.
  • English

    Native or bilingual

  • German

    Native or bilingual

Can work on-site
Munich (up to 50km), Hamburg (up to 50km), Berlin (up to 10km)

Experience

  • Inspired Data
    Full-Stack Architect & Software Engineer
    MECHANICAL ENGINEERING
    February 2026 - April 2026 (2 months)
    Productization of a proprietary machine learning model from a Jupyter notebook
    to a scalable, multi-tenant cloud web-service
    • Go backend for admin component, queue management, file handling, public API
    • Self-service dashboard to set up and monitor the models
    • Enterprise grade AWS setup; IaS via CDK; strict environment isolation
    Machine learning Amazon Web Services (AWS) Typescript IT Architecture Python
  • Serverpod AB
    Senior Backend Developer
    DIGITAL AND IT
    February 2025 - July 2025 (5 months)
    Stockholm, Sweden
    Improved the database migration engine to handle more edge cases
    • Added support for Dart record and container types in the client-server protocol and
    data storage
    • Created the next generation authentication module: Overhauling the social login;
    adding JWT, passkey, and magic link support; supporting legacy accounts in a
    backwards compatible way
    Dart Backend Service Development CI/CD Management IT Architecture
  • TELESON Vertriebs GmbH
    Senior Mobile App Developer
    ENERGY AND UTILITIES
    December 2023 - Today (2 years and 6 months)
    Munich, Germany
    Built new Flutter mobile app version replacing 2 separate Android and iOS code bases
    (porting business logic from Swift & Kotlin)
    • Added full offline support using local databases (Hive, Floor) and implementing a robust sync framework to update the server once the client regains network access
    • Set up testing infrastructure and introduced CI workflows (CodeMagic)
    • Sped up client development by auto-generating APIs from the spec
    • Implemented on-device PDF editing workflows (filling & signing forms)
    Flutter Mobile Entwicklung OpenAPI

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Skill set

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