Platform Engineer, APIs & Observability

Responsibilities

• Help build the public API as a product. Design, version, and evolve the API and SDKs that StackAI customers build on, and keep the developer experience first-class.
• Set our API standards. Help define the conventions, versioning and deprecation policy, and review bar that keep every API across the platform consistent and predictable.
• Make agent runs observable. Build tracing and instrumentation that let anyone follow a single agent run end to end, across its models, tools, and sub-agents.
• Turn usage into analytics customers act on. Build the reporting that shows customers how their agents perform, what they cost, and where to improve.
• Own the audit trail. Build the audit logging and team-scoped views enterprises rely on.

Requirements

• 4+ years building backend services and public APIs in production.
• Strong API craft: RESTful design, SDK ergonomics, and rate limiting.
• Experience defining API standards and governance: versioning, deprecation, and consistency across services.
• Fluency with observability and analytics: distributed tracing, metrics, and turning raw signals into data products people rely on.
• Strong in Python and modern backend frameworks (FastAPI or similar), comfortable across TypeScript/Node.js on the product surfaces.

Nice-to-Haves

• OpenTelemetry or distributed tracing at scale.
• Analytics datastores (ClickHouse, Druid, or similar).
• Designing developer-facing SDKs used by external customers.
• AI or LLM platform experience: token and cost accounting, agent-run tracing.
• Startup or growth-stage experience.