Remote Founding Sr/Staff Engineer (Rails/Postgres)

Our client is a mission-driven startup with clients and is already profitable. They are a platform supporting political campaigns and non-profit fundraising. They are looking for a Founding Sr/Staff Software Engineer to join their CTO and scale the platform.Techstack: Rails monolith / Postgre with partitioningYou'd own:End-to-end featuresHardening workMigrations on partitioned, multi-tenant tablesYou'll bring:5+ years of production Rails experience; comfortable in modern idiomsStrong PostgreSQL fundamentals — query plans, indexing, transactions, lockingSidekiq or comparable background-job experienceMulti-tenant data isolation experienceComfort owning code where compliance, money, or PII errors are not recoverableServer-rendered UI sensibility; we don't run a JS SPAThis is a chance to join a founding team with real product traction and room to shape architecture.