Agent Harness Engineer (On-site)
Core
Build the runtime and infrastructure for a general-purpose AI agent (Viktor) that executes tasks across thousands of business integrations reliably.
Role type
Senior IC agent harness engineer
Builds
Agent runtime, tool integrations, memory systems, and evaluation frameworks for a general-purpose AI agent
Domain
AI Agents / LLM Infrastructure / Enterprise Integration
Deliverable
production ML models
Required skills
AI agent development, Python, TypeScript, systems design, evaluation frameworks, infrastructure as code, rapid prototyping, debugging at scale
Preferred skills
prior AI engineering experience, open source contributions to AI tooling, founder/early-stage builder experience
Technologies
Python, TypeScript, React, Modal
Responsibilities
Build the agent runtime loop for planning, acting, and verification; compose tools across 3,000+ integrations; develop memory and self-writing skills; implement evaluation systems to catch regressions; ship features to Slack and Teams; fix production incidents end-to-end
Seniority
Senior, hands-on IC