Close is hiring a Senior (or Staff) Backend Engineer for the Backend Platforms team (USA-only, 100% remote). The role focuses on building developer-facing platforms and primitives: cloud development environments (DevDawg), AI/code-review tooling (Spice), API paved roads (REST/OpenAPI/GraphQL), backend framework modernization, observability and production readiness, shared backend services, and guardrails for coding agents. The stack emphasizes Python (Flask), TaskTiger, MongoDB, PostgreSQL, Elasticsearch, Redis, AWS, Docker, and Kubernetes.