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Python Developer (42335)

CoolPeople

3.5
10 reviews
CoolPeople
Job Type   /   Job Level
Contract   /   Others/Any
Job Location
Vienna, Vienna, Austria
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I'm seeking a Python Developer, who will maintain a Node.js (Express/Koa) backend, ensuring stability and performance, while helping build a Python-based LLM orchestration platform. Work includes LangChain, prompt engineering, CI/CD, Docker, and cloud (AWS/Azure/GCP). The role transitions toward full AI development. Strong Python, backend systems, and LLM experience required.

🚀 Project

  • building and transitioning a conversational AI feature for a digital banking platform
  • maintaining and stabilising an existing Node.js backend in the short to mid-term (bug fixes, minor enhancements, reliability improvements)
  • ensuring ongoing stability and performance of production backend services in a regulated environment
  • contributing to the design and development of a new Python-based orchestration layer for conversational AI
  • working with LLM APIs, prompt engineering, and orchestration frameworks such as LangChain
  • supporting integration of large language models into production-ready systems
  • gradually transitioning from legacy Node.js services to a Python/AI-focused architecture
  • participating in system design and technical decision-making for the AI platform
  • engaging in an initial maintenance-focused role with a planned shift toward full-time AI development (Python/LLM stack)

🎯 Skills

  • experience with existing Node.js backend development (Express / Koa-style frameworks)
  • strong proficiency in Python (minimum 3 years of professional experience)
  • practical experience with LLM applications, including LangChain / LangGraph
  • solid understanding of prompt engineering and LLM orchestration patterns
  • experience with Kotlin backend development and service-oriented architectures
  • working knowledge of databases: PostgreSQL, MongoDB, Redis
  • experience with containerisation using Docker
  • familiarity with CI/CD pipelines and modern DevOps practices
  • cloud experience with at least one major provider: AWS / Azure / GCP
  • esting experience with Jest / Mocha for Node.js, pytest for Python
  • experience working in cross-functional teams (engineering, product, design)
  • strong emphasis on code quality, peer reviews, and automated testing practices

💡 Nice to have

  • security/auth familiarity (JWT, OAuth2)
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