About this role
Your mission We are looking for a mid-level Python Backend Engineer with strong engineering fundamentals and an interest in AI to build and evolve the services and integrations behind Helu. Hands-on experience with technologies such as LLMs, MCP or agents is a plus. Your responsibilities <h3>Backend Engineering</h3><strong> </strong><br><ul><li>Design, build and maintain scalable backend services in Python.</li><li>Build reliable APIs, integrations and business logic.</li><li>Write clean, reliable and well-tested code.</li><li>Improve system performance, reliability, security and maintainability.</li><li>Identify technical bottlenecks and continuously improve the platform.</li><li>Participate in architecture discussions and technical decision-making.</li><li>Expose existing system capabilities through clear, secure and well-structured interfaces.</li></ul><h3>AI Engineering</h3><ul><li>Contribute to production-ready LLM-powered features.</li><li>Help connect AI systems to Helu's backend capabilities through APIs, tools and standards such as MCP.</li><li>Build agents that can understand user intent and safely interact with Helu’s data and product capabilities.</li><li>Implement validation, guardrails, permissions and fallback mechanisms.</li></ul> <br><h3>Cross-functional Collaboration</h3><ul><li>Collaborate with Product, Frontend and Data engineers.</li><li>Help shape architecture decisions across Backend and AI.</li><li>Share knowledge across teams and continuously improve engineering standards.</li></ul><br><br> Your skills <ul><li style="font-family:Arial, Helvetica, sans-serif;">3+ years of Python professional experience.</li><li style="font-family:Arial, Helvetica, sans-serif;">Experience with FastAPI or similar frameworks.</li><li style="font-family:Arial, Helvetica, sans-serif;">Solid understanding of software design and engineering best practices.</li><li style="font-family:Arial, Helvetica, sans-serif;">Robust SQL knowledge.</li><li style="font-family:Arial, Helvetica, sans-serif;">Experience with Git, CI/CD and AWS.</li><li style="font-family:Arial, Helvetica, sans-serif;">Strong analytical and problem-solving skills.</li><li style="font-family:Arial, Helvetica, sans-serif;">Ability to work independently and collaboratively.</li></ul> <br><h3>Nice to Have</h3><ul><li>Experience with Docker, GraphQL or Terraform.</li><li>Experience building LLM-powered product features.</li><li>Familiarity with MCP, tool calling, AI agents, RAG or vector databases.</li><li>Experience operating or evaluating AI-powered systems.</li></ul> You can expect: <ul><li style="font-family:Arial, Helvetica, sans-serif;">Join one of Europe’s most exciting AI-first finance start-ups.</li><li style="font-family:Arial, Helvetica, sans-serif;">Significant ownership and responsibility.</li><li style="font-family:Arial, Helvetica, sans-serif;">Work on a modern Python backend and AI-native product.</li><li style="font-family:Arial, Helvetica, sans-serif;">Hands-on exposure to LLMs, agents and emerging AI technologies.</li><li style="font-family:Arial, Helvetica, sans-serif;">An ambitious, international team and modern engineering practices.</li><li style="font-family:Arial, Helvetica, sans-serif;">Competitive compensation and equity participation.</li><li style="font-family:Arial, Helvetica, sans-serif;">Work remotely or from our office in the heart of Vienna, with quarterly office weeks.</li><li style="font-family:Arial, Helvetica, sans-serif;">Competitive compensation, equity participation and meaningful opportunities for personal and professional growth.</li></ul>