CareerPlan

Backend Engineer - AI Agents (all genders)

Köln, NORDRHEIN_WESTFALENFull-time2026-10-07 → 2026-11-05
Hybrid

Core

Build and improve AI agents for customer service, focusing on agent loops, tool calling, context management, and model switching.

Role type

Senior Backend Engineer (AI Agents)

Builds

AI agents for customer messaging solutions

Domain

AI / Customer Service

Deliverable

production ML models

Required skills

Backend development, AI agent architecture, RAG, vector databases, evaluation frameworks (LLM-as-a-judge), API integration, MCP tools

Preferred skills

Pydantic AI, LiteLLM, Langfuse, Arize Phoenix, LangSmith

Technologies

Python, Langfuse, Arize Phoenix, LangSmith, Pydantic AI, LiteLLM

Responsibilities

Build and improve AI agents from agent loop to tool calling; Set up architecture for language model switching; Use evals to verify improvements; Connect APIs and MCP tools for agent knowledge; Collaborate with Product team on AI initiatives

Seniority

Senior, hands-on IC