AI Harness Engineer

Employment type: FULLTIME. Requisition: 3084035. AI Harness Engineer (Senior/Principal) About the role We've had real wins with AI at Milestone, but they've mostly stayed inside the teams that found them. We're looking for someone to take what's working and build it into a platform the whole engineering organization can rely on.

The work sits in the layer around the models: the gateway, agent tooling, context handling, evaluations, guardrails, observability, and cost controls that make AI dependable for real engineering work. You'll own that layer, not just run it, but set the technical standards and reference architectures other teams build against. The first phase is our internal development environment.

From there, you'll bring the same rigor to the AI features going into our products, working alongside the teams that own them. Part of the job is being straight with us about where AI doesn't help, not only where it does. On level: we're open at both senior and principal. At senior, we expect you to build and operate this platform.

At principal, we additionally expect you to set the technical direction for AI-assisted engineering across the organization — the person other staff and principal engineers argue with and come away convinced by1 …