Backend Engineer

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.

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., * 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.

• 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.

Helu is the leading FP&A software on DATEV.

As successful Austrian scale-up tech company that raised $10m Series A recently, we help business leaders plan forecast and analyze their performance with any data. We are an experienced team with strong values and look for well-rounded people who think long term and love new technologies.

Every three months, the Helu team meets for an office week in Vienna, where we work on our company culture, our values, and a healthy team spirit. Colleagues work together, get to know each other better, explore Vienna, do sport activities, party and have fun.

The company is founded by a successful serial-entrepreneur and backed by numerous unicorn founders and renowned investors (Bitpanda, Wefox, Atlantic Labs).