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Agent Harness Engineer

Viktor· Product & Engineering
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Warsaw or Munich onsite, remote in EuropeFull-timePosted 2mo ago

About the role

Engineer an agent harness capable of AGI-scale interaction, focusing on context engineering, memory, tools integration, and eval-driven improvement. Ship features rapidly to users and shape the system that enables autonomous agent work across many workspaces.

Responsibilities

  • Build the agent runtime: the loop where it plans, acts, and verifies its own work instead of declaring success it didn't earn.
  • Engineer the context: shape how the system prompt, skills, memory, and tools combine, and how the agent holds up when problems get diverse and complex.
  • Make the agent fluent with tools: composition across many integrations, recall, and the skill files that keep the right functions at hand.
  • Grow what the agent can do: memory it can trust, skills it writes for itself, work it runs on its own.
  • Make it measurably better: evals, catching regressions, and turning every failure into a fix.
  • Ship product: features that reach users through Slack and Teams within hours.
  • Whatever needs building. Small team, large surface.

Qualifications

  • You've personally built or significantly modified an AI agent harness, and can describe the trade-offs you made.
  • You understand how an agent's system prompt, skills, and tools interact on diverse and complex problems, and you've tuned that interplay yourself, not just read about it.
  • You've built custom skills, commands, CLIs, or MCP servers to make your own agentic coding faster.
  • Agentic coding is your daily workflow, and you've stress-tested models and harnesses across the frontier.
  • Systems thinking. You make hard technical trade-offs and design for how things break at scale.
  • Speed, with the bar up. You ship today, not Thursday.
  • Genuine interest in how AI works. You've read the papers and have opinions about evals.

Skills

Required:Agent harness design and implementationMemory and tool integration for agentsEval infrastructure and regression testing

Benefits

  • Top-of-the-market salary
  • Ownership at this stage
  • Frequent in-person team gatherings a few times per year
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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