Backend Engineer - AI Agents (all genders).

What You'll Be Working On

• Within the backend team, you're the go-to person for AI and work closely with Product.
• You further develop our AI agents and automation solutions such as Connect AI, from the agent loop and tool calling to context management.
• You help shape our AI architecture and make sure we can work flexibly with different LLMs.
• When it comes to quality, we rely on evals with real customer conversations and methods like LLM-as-a-judge. You help expand this area so every new version gets measurably better.
• Through APIs, MCP tools and website crawling, you give our agents the knowledge and tools they need.

What Makes You a Fit

• You have at least five years of backend experience, including one year building AI features based on language models that people use every day.
• Python is your tool of choice, and ideally you already know Django.
• You've built AI agents before and know context windows, tool calling and prompting from hands-on work.
• You've worked with RAG and vector databases yourself.
• You're familiar with evals, whether with Langfuse, Arize Phoenix, LangSmith or something you built yourself.
• Libraries like Pydantic AI or LiteLLM are a plus.
• You follow what's happening in AI, try things out quickly and take ownership of your topics.
• You're fluent in German and English.

What’s in It for You

• 600 € health budget per year, including 24/7 medical advice — also for family members in your household
• Subsidised Urban Sports Club membership (20 € monthly contribution)

• Learning budget for courses, books and conferences
• Free access to Udemy, Masterclass and language learning apps
• Leadership programmes such as "Next Gen" and "Effective Manager"

• Weekly FIKA, movie nights, book club and regular get-togethers and team events
• International summer party together with our colleagues in the Nordics

• Office-first setup: 3 days in our Cologne office at the MediaPark, 2 days remote
• 360° view across Cologne from the 14th floor
• Workation within the EU
• Snacks, cereal bar and drinks in the office

• Company pension scheme via Zurich with a 30 % employer contribution
• Job ticket or mobility budget, plus free parking at the MediaPark
• Corporate benefits
• 28 days of holiday, plus Christmas Eve and New Year's Eve off
• Up to 5 days of special leave for important life events