Agent-first engineering organization building foundational systems powering the Fountain ecosystem.What You’ll be Doing: Ship platform capabilities; own performance/security/stability; enhance agentic systems; lead architecture; design reliable code/APIs; collaborate across teams; work autonomously and own outcomes.What you bring: 5+ years backend-focused engineering; expert systems design; strong technical judgment; experience with LLM/agentic systems; initiative and excellent written communication. Nice to have: Designed agent-facing APIs/tools; startup experience; event-driven architectures/monorepos/observability.