Senior Frontend Engineer (Growth) responsible for shipping fast experiments and production features in a TypeScript/React single-page app. Work includes building agent-forward onboarding and unstructured-data import experiences, designing and instrumenting B2B experiments (Amplitude), and implementing AI/LLM-backed interfaces. Tech touched includes React, TypeScript, Vite, testing tools (Vitest, React Testing Library, Playwright, Chromatic), WebSockets/WebRTC, CSS Modules, Storybook, GraphQL/REST, and backend services on Python, MongoDB, Postgres, Elasticsearch running on AWS.

Close is hiring a Senior Software Engineer (Frontend/React) to build and maintain a TypeScript React single-page app. The role involves working with real-time technologies (WebSockets, WebRTC), testing and visual-regression tooling, a custom design system/Storybook, and integrating AI/LLM-backed features. Backend stack and services referenced include REST/GraphQL endpoints, Python (Flask/FastAPI), MongoDB, Postgres, Elasticsearch, and AWS. The position is remote and limited to candidates based in the USA.