Principal Harness Engineer
- Location
- United Kingdom
guides, feedback loops, guardrails, and shared context that turn raw model capability into production-grade engineering. This is a hands-on role focused on systems and leverage, not hand-writing application code.* Own and evolve feedforward guides - agent instruction files, reusable skills, architectural rules, reference docs, and codemods … familiarity with agent instruction conventions such as AGENTS.md.* Experience with spec-driven development, context engineering, agent orchestration, fitness functions, and developer-platform work.* A systems mindset - you'd rather fix the environment than fix one output - and the ability to encode \"what good looks like\" into mechanical, repeatable rules. ...