Senior Software Engineer - LLM Observability

Architect and implement backend services and APIs in Go (plus React/TypeScript frontend) for the LLM Observability team, defining how AI systems are represented in telemetry (spans, traces, token usage, cost, eval signals). Provide technical leadership, work within a product triad, and own software in production (on-call). Requires deep backend experience building APIs/services in Go (or similar), React/TypeScript proficiency, a track record leading complex multi-team projects, and an interest in observability/production culture. Bonus: AI-assisted dev tooling (Copilot, Claude Code, Cursor). No visa sponsorship.