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Backend Engineer

Viktor· Product & Engineering
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Warsaw, MunichFull-timePosted 2mo ago

About the role

Backend Engineer responsible for building and operating Viktor's core backend systems, including integrations gateway, sandboxes, and data layer to support AGI-driven automation at scale.

Responsibilities

  • Own integration quality end to end: catch issues before customers do, fix them, and make sure they can't recur.
  • Build the tool gateway: turn every connected API and MCP into a clean Python SDK the agent composes, with routing, auth, rate limits, and reliability.
  • Run the sandboxes: a persistent Linux environment per workspace, isolated, secured, autoscaled, and cheap per task.
  • Own the data layer: state and persistence across tens of thousands of multi-tenant workspaces, durable and fast.
  • Whatever needs building. Small team, large surface.

Qualifications

  • 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.

Skills

Required:Distributed systems designSandboxing and OS-level isolationOAuth and webhooks
Last updated Oct 20, 2026. Interested? Apply on the company site.
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About Viktor

Viktor | Not a tool. A hire.

Viktor is the AI employee that lives in Slack and Microsoft Teams, connects to 3,200+ tools, and does the work.

3,200+ integrationsSlack and TeamsReports, dashboards, appsCode and PR reviewsSOC 2 compliantAuditsSecurityAutomation
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