Backend / Systems Engineer, Agent Infrastructure (m/f/x)

Title: Backend / Systems Engineer, Agent Infrastructure (m/f/x) Location: Berlin, Germany xHeron takes responsibility for guest operations for short-term rental businesses: guest communication, coordinating teams, resolving issues. Today, that operating scope is delivered through a mix of people, software, and AI. We're building the technology to handle more of that work autonomously, without turning into another tool customers have to supervise. We're looking for a Backend / Systems Engineer to build the software that makes this reliable: persistent state, safe execution, permissions, and recovery across humans, agents, and external systems. ## Tasks **What You'll Own** * Data models & state: Build backend services and data models that track operational work, ownership, and outcomes over time. * Asynchronous workflows: Develop asynchronous workflows with reliable handling of retries, timeouts, external events, and interrupted execution. * APIs & tool execution: Build shared APIs and tool-execution interfaces, including authorization and customer-data isolation. * Knowledge infrastructure: Improve the infrastructure for storing, versioning, and serving operational knowledge. * Platform quality: Strengthen testing and observability while evolving the existing platform alongside our CTO, AI engineer, and product engineering team. ## Requirements **What Makes You a Great Fit** * Strong backend engineering skills in Python and/or TypeScript/Node.js, with willingness to work across both. * Practical experience with PostgreSQL or another relational database, including data modeling and transactions. * Experience shipping and maintaining production backend services. * Familiarity with background jobs, queues, or event-driven processing, and an understanding of failure handling and data consistency. * The ability to investigate production problems, design clear interfaces, and deliver maintainable solutions. Around 3+ years of backend engineering experience is a useful guide, not a hard requirement. The systems you've owned matter more than the number. Nice to have: experience with workflow engines, multi-tenant applications, authorization, FastAPI, or agent tooling. Prior LLM experience is not required. Strong backend fundamentals and an interest in learning the agent domain matter more. **You May Not Be a Great Fit If** * You want to configure infrastructure, not design the systems underneath it. * You need a fully scoped spec instead of investigating ambiguous problems yourself. * You've never shipped and maintained a production backend service. * You favor clever or complex solutions over simple, maintainable ones. * You're looking for a defined 9-to-5. ## Benefits **Why Join xHeron** * Real ownership: you're working on foundational product architecture, not cloud configuration, with substantial technical ownership from day one. * Direct founder access: you'll work directly with our CTO, shaping how humans and agents work together. * We invest in our own: your ownership grows as the system does, this isn't a role with a ceiling. * Upside: VSOP alongside salary; you're building this with us. **Our Process** * Intro call (30 min): a conversation with Friedrich (CTO) about your background, what you've built, and why this role. * Technical take-home case study: a short, real engineering problem, close to what you'd actually be building. * Case study interview (1 hour): you walk us through your thinking, not just the final code. * Culture fit (30 min): meet both Founders and make sure it's a fit both ways.