Backend Engineer

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

Backend Engineering

• Design, build and maintain scalable backend services in Python.
• Build reliable APIs, integrations and business logic.
• Write clean, reliable and well-tested code.
• Improve system performance, reliability, security and maintainability.
• Identify technical bottlenecks and continuously improve the platform.
• Participate in architecture discussions and technical decision-making.
• Expose existing system capabilities through clear, secure and well-structured interfaces.

AI Engineering

• Contribute to production-ready LLM-powered features.
• Help connect AI systems to Helu's backend capabilities through APIs, tools and standards such as MCP.
• Build agents that can understand user intent and safely interact with Helu’s data and product capabilities.
• Implement validation, guardrails, permissions and fallback mechanisms.

Cross-functional Collaboration

• Collaborate with Product, Frontend and Data engineers.
• Help shape architecture decisions across Backend and AI.
• Share knowledge across teams and continuously improve engineering standards.

Your skills

• 3+ years of Python professional experience.
• Experience with FastAPI or similar frameworks.
• Solid understanding of software design and engineering best practices.
• Robust SQL knowledge.
• Experience with Git, CI/CD and AWS.
• Strong analytical and problem-solving skills.
• Ability to work independently and collaboratively.

Nice to Have

• Experience with Docker, GraphQL or Terraform.
• Experience building LLM-powered product features.
• Familiarity with MCP, tool calling, AI agents, RAG or vector databases.
• Experience operating or evaluating AI-powered systems.

You can expect:

• Join one of Europe’s most exciting AI-first finance start-ups.
• Significant ownership and responsibility.
• Work on a modern Python backend and AI-native product.
• Hands-on exposure to LLMs, agents and emerging AI technologies.
• An ambitious, international team and modern engineering practices.
• Competitive compensation and equity participation.
• Work remotely or from our office in the heart of Vienna, with quarterly office weeks.
• Competitive compensation, equity participation and meaningful opportunities for personal and professional growth.

Why us?