Agent Harness Engineer

The role

You will build an agent runtime, engineer context, and make agents fluent with tools. You will work on a harness designed to turn model intelligence into real work through planning, acting, and verifying.

What you will do

• Build the agent runtime
• Engineer the context including system prompt, skills, memory, and tools
• Make the agent fluent with tools through composition and recall
• Grow agent capabilities like memory and self-written skills
• Make the agent measurably better through evals and fixing regressions
• Ship product features to Slack and Teams
• Build whatever needs building

Required qualifications

• Personally built or significantly modified an AI agent harness
• Understand how an agent's system prompt, skills, and tools interact on diverse and complex problems
• Built custom skills, commands, CLIs, or MCP servers
• Agentic coding is your daily workflow
• Stress-tested models and harnesses across the frontier
• Systems thinking
• Genuine interest in how AI works
• Python

Nice to have

• Previous AI engineering experience: agents, harnesses, eval infrastructure
• Previous founder or early-stage builder
• Open source contributions to the AI tooling

Benefits

• Top-of-the-market salary
• Ownership

About the company

Viktor is building a harness that can hold an AGI-level model and make it useful for everyone. It is one of the fastest-growing companies in the world.