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 Stack Ruby on Rails · React · TypeScript · PostgreSQL · Google Cloud · SidekiqWhat You'll OwnDriving the technical direction of key Applications platform featuresShipping full-stack work end-to-end: API → data model → UIMentoring L2 engineers and leading technical design discussionsContributing to architectural decisions across the monolith and SPASharing on-call duties and helping evolve engineering standardsWhat We're Looking For8+ years full-stack experience, with deep Rails + modern React fluencyA track record of owning complex features from design through productionAdvanced SQL and a genuinely analytical, evidence-led mindsetProven ability to mentor and influence technical directionExcellent async communication — this is a fully distributed teamReal excitement about mission-driven workBonus PointsHealthcare tech, social services, or other practitioner-facing domainsMulti-tenant data models, RBAC, accessibility-aware UIExperience 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.