Senior Software Engineer (L3) - Healthcare Tech NonprofitWant your code to actually matter? We're hiring on behalf of a mission-driven healthcare technology nonprofit whose platform has reached tens of millions of patients in low-income communities across the US. They're growing the team that builds the SaaS product hundreds of safety-net clinics rely on every day to manage patients and run patient engagement programs.This is a senior IC role with shared team-lead responsibilities - owning complex full-stack features end-to-end, mentoring mid-level engineers, and shaping architecture across a Rails monolith and React SPA.The StackRuby on Rails · React · TypeScript · PostgreSQL · Google Cloud · SidekiqWhat You'll Own Driving the technical direction of key Applications platform features Shipping full-stack work end-to-end: API → data model → UI Mentoring L2 engineers and leading technical design discussions Contributing to architectural decisions across the monolith and SPA Sharing on-call duties and helping evolve engineering standardsWhat We're Looking For 8+ years full-stack experience, with deep Rails + modern React fluency A track record of owning complex features from design through production Advanced SQL and a genuinely analytical, evidence-led mindset Proven ability to mentor and influence technical direction Excellent async communication — this is a fully distributed team Real excitement about mission-driven workBonus Points Healthcare tech, social services, or other practitioner-facing domains Multi-tenant data models, RBAC, accessibility-aware UI Experience scaling a Rails monolith with a React SPA frontendInterested?Apply here or message me directly - happy to walk you through the role, the team, and the mission before you commit to a full process.