Senior Backend Developer

As a Senior Backend Engineer (m/f/d), you are the architect and builder of our microservice landscape. You will work directly with our Tribe Lead Engineering to ensure our LLM-based AI solutions run on a performant and reliable infrastructure., * Architecture & Development: You will design, build, and maintain highly available microservices in Python (FastAPI), running on GCP (Cloud Run, Cloud Functions).

• Data Performance: You will own our APIs, ensuring they communicate efficiently with our high-performance databases (ClickHouse and BigQuery).
• Ownership & Quality: You will take responsibility for your services through the entire lifecycle-from conception, clean, tested code, and code reviews, all the way to deployment in our CI/CD pipelines.
• Scalability: You'll ensure our systems scale reliably to handle rapidly increasing transaction volumes.
• Collaboration: You will be the key technical partner for our Data, AI, and Frontend (Flutter) teams, ensuring our APIs meet their needs.

Do you have experience in Python?, Do you have a Master's degree?, * Experience: Several years of well-founded professional experience as a Backend Engineer, ideally in a startup or SaaS environment.

• Tech-Stack (Backend): Expert knowledge of Python and modern frameworks (ideally FastAPI or Flask).
• Tech-Stack (Databases): Deep, practical experience with ClickHouse or BigQuery in the context of backend applications.
• Cloud-Native: You are a pro on GCP (or AWS/Azure with a strong desire to switch) and live "serverless" (Cloud Run, Cloud Functions, Pub/Sub).
• System Design: Proven experience in designing and operating scalable microservice architectures and RESTful APIs.
• Quality: You write tests out of conviction and understand that Data Integrity is inviolable.
• Language: Fluency in German (min. B2) is required.

• Compensation: Competitive salary, benefits, and Virtual Stock Options (VSOP).
• Culture: An agile, learning organization and international team culture here in Mainz. We learn from retrospectives and share knowledge proactively.
• Modern Tools: We love efficiency. Cursor AI is standard for us.
• Strong Partners: Benefit from our close collaboration with Google Cloud and various universities.