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Senior engineer to step into a ~30k LOC system (~300 files) and help shape it properly. Production-style system with real complexity. Interdependent modules, async flows, external integrations. Stack: Python/FastAPI backend, Next.js frontend, early-stage routing/AI components. Expectations: - quickly understand an existing codebase - trace data flow across modules/services - identify structural issues and bottlenecks - make pragmatic improvements without overengineering Starts with a deep dive and direction, with room to stay involved and build it out. AU-based only (R&D constraints). Email: mattahbla+hn@gmail.com