Backend Engineer
Viktor, Warsaw +1
What you need
- You design distributed systems for scale and reliability, and have operated them in production through the breakage.
- You know sandboxing and OS-level isolation cold: containers, Linux internals, running untrusted code safely.
- You've wrangled real integration plumbing: OAuth, webhooks, rate limits, and third-party APIs that lie.
- You think in multi-tenancy, durability, and cost per request, and design for failure by default.
- Security and blast radius are instincts you bring to every design, especially when the thing executes model-written code.
- You build with AI by default, because that's how the team moves.
- You may never have shipped an LLM feature, and that's fine. This is a systems role.
Nice to have
- You've worked on infrastructure, platform, or developer-tools teams where reliability was the product.
- You've built sandboxing, code-execution, or multi-tenant systems before.
- You're at home in agentic engineering workflows, spec to production.