Ionworks

Ionworks builds battery simulation and optimization software used by R&D teams designing next-generation batteries. Seeking a founding backend/systems engineer to own large pieces of the backend and help scale from early customers to broader industry use. Work includes FastAPI, async Python, Supabase/Postgres; designing APIs and data models for simulation and optimization workflows; performance and reliability work across the stack (queries, async, concurrency, resource limits); job orchestration for running and tracking simulations; and observability (logging, metrics, tracing, debugging real issues). The team values a "vibe engineering" style using LLMs and coding agents as accelerators while planning ahead, writing tests, supervising agents, and maintaining code quality and architecture. Remote (US) or Pittsburgh, PA. Apply by emailing valentin@ionworks.com with "HN backend" in the subject or via the application link.