Backend Engineer

Build and operate the backend systems that let AI agents use connected tools reliably. You will own core infrastructure across integrations, secure code execution, and multi-tenant data, working closely with the founding team in a fast-moving environment.

• Design and operate a tool gateway that exposes connected APIs and MCP integrations through a Python SDK, with routing, authentication, rate limits, and reliability built in.
• Run persistent, isolated Linux sandboxes for work spaces, with attention to security, autoscaling, and cost.
• Own durable, high-performance multi-tenant state and persistence systems designed to handle failures.
• Identify and resolve integration issues, then improve system architecture to prevent them from recurring.
• Work directly with users and the founding team to make and ship product and infrastructure decisions.

• Typically 3 to 10+ years of experience building and operating production backend systems.
• Strong distributed systems experience, including designing for reliability and operating systems through failure.
• Hands-on expertise with containers, Linux internals, sandboxing, and safely running untrusted code.
• Experience building Python services and working with infrastructure tooling such as Modal.
• Practical experience with OAuth, webhooks, rate limits, and third-party API integrations.
• Background in infrastructure, platform, developer tools, runtime systems, or secure code execution, with experience designing multi-tenant systems.

Visa sponsorship is not available.

On-site in Munich, Germany. Candidates based in Warsaw, Poland, or willing to relocate to Munich or Warsaw for on-site work may also be considered.