Senior Product Engineer

Responsibilities

• Build and evolve streaming chat surfaces and agent workspaces, including persistence, tool-call and approval experiences, and citation rendering.
• Partner with the platform team on the app builder, generated toolchain, preview sandbox, and generation/repair-loop user experience.
• Maintain shared components and the design system across chat, workspaces, and the app builder.
• Build agent-facing developer experience including the CLI, deployment tooling, and manifests.
• Own the full stack of features across TypeScript, Node/FastAPI, Postgres, deployment, observability, and on-call.
• Implement enterprise readiness through accessibility, localization, and audit trails.
• Debug across product, backend, and platform boundaries using service traces and Kubernetes logs.

Requirements

• At least 5 years of deep, production experience with React and TypeScript, including streaming UIs, high-frequency updates, virtualization, state management, and hands-on React 19 knowledge.
• End-to-end experience with SSE or WebSocket streaming, including chunk boundaries, reconnection, abort propagation, and raw byte-stream debugging.
• Experience shipping backend services for personal front ends using Node/Fastify or Python/FastAPI, including authentication, idempotency, pagination, race conditions, and migrations.
• Product and enterprise experience with defensible accessibility, thoughtful empty and error states, and localization beyond a strings file.
• Daily use of AI coding tools with examples of overriding tool output and a specification-driven development approach.
• Experience with instrumentation, evaluations of AI-dependent behavior, cost awareness, and on-call ownership.
• Practical depth with TypeScript, React 19, TanStack Query, Vite, Node/Fastify or Python/FastAPI, Postgres, Redis, and SSE/WebSocket streaming.
• Familiarity with Zod-validated wire contracts, sandboxed iframes, CSP, postMessage, Playwright, Vitest, WCAG 2.2 AA, i18n frameworks, and OIDC/OAuth2 session mechanics.
• Bachelor's degree required; master's degree is a plus.
• Must be authorized to work full-time in the United States without current or future visa sponsorship.

Benefits

• Competitive early-stage startup compensation based on capabilities, experience, and location.
• Bonus eligibility and equity.
• Health insurance with meaningful dependent coverage.
• Flexible paid time off.
• Fully remote culture with a cluster of teammates in Seattle.
• Travel to company summits twice per year is required.