Backend Engineer - AI Agents
in
50667, Köln, Nordrhein-Westfalen, Deutschland
Verfasst am 2026-10-09
Unternehmen:
Personio
Vollzeit
position Verfasst am 2026-10-09
Berufliche Spezialisierung:
-
Software Entwicklung
Backend Entwicklung, Künstliche Intelligenz Ingenieur
Stellenbeschreibung
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.
- 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, Lang Smith 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.
- 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 Media Park, 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 Media Park
- 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
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