GreenPocket GmbH

AI & ML Engineer – Cologne-based Startup

GreenPocket GmbH

full-time

Posted on:

Location Type: Hybrid

Location: Köln • Germany

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Tech Stack

CloudJavaScriptPythonTypeScript

About the role

  • Further development of our product through AI integration based on modern LLM architectures (multi-model strategy using different Large Language Models)
  • Design, implementation and optimization of RAG architectures (Retrieval-Augmented Generation) using our own vector database to connect domain-specific knowledge bases to LLMs
  • Design and development of an AI agent that actively assists end users in operating the software (agentic workflows, tool-calling, memory handling, guardrails)
  • Design of an integration agent that can automatically connect and configure interfaces to customer systems (e.g., REST, webhooks, events)
  • Technical and strategic evaluation (buy vs. build) in the area of Intelligent Document Processing (IDP), including market analysis, PoCs and architectural decisions
  • Development of robust prompt and system architectures, including evaluation, testing, monitoring and performance optimization
  • Implementation of evaluation frameworks for LLM outputs (quality, hallucination rate, relevance, cost/benefit)
  • Integration into existing backend and frontend systems, including API design, security and scalability
  • Close collaboration with the CTO, CEO, product management, UX/UI and backend teams to define AI features with clear business value

Requirements

  • You hold a degree in computer science or a comparable qualification that convinces us
  • At least 3 years of practical experience delivering production AI projects
  • Demonstrable experience with: Large Language Models (prompt engineering, fine-tuning, RAG)
  • Embeddings and vector databases
  • API integration and backend development
  • Evaluation and monitoring of AI systems
  • Strong overview of the current LLM landscape (models, frameworks, agent approaches, open-source ecosystems)
  • Confident working knowledge of common tech stacks (e.g., Python, TypeScript/JavaScript, REST, containerization, cloud environments)
  • Experience in architecture decisions (scalability, cost optimization, security, data protection)
  • Structured, analytical working style and the ability to translate technical concepts into product value
Benefits
  • Intensive coaching and development opportunities
  • A permanent position with the opportunity to help shape the green founder scene
  • Startup atmosphere with a lot of creative freedom, flat hierarchies and short decision paths
  • Flexible working hours and the option to work from home
  • Take Your GreenDay! Step away from the everyday and dedicate one day per month entirely to your own ideas
  • Regular team events and foosball breaks with motivated, friendly colleagues
  • Unlimited coffee and water supplies as well as regular fresh fruit
  • Culturally, athletically and transport-wise very well-connected location
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
Large Language Modelsprompt engineeringfine-tuningRetrieval-Augmented Generationembeddingsvector databasesAPI integrationbackend developmentevaluation of AI systemsmonitoring of AI systems
Soft Skills
structured working styleanalytical working styleability to translate technical concepts into product value
Certifications
degree in computer science