Senior Software Engineer I, L3 Messaging Team (Remote)We're recruiting a Senior Software Engineer I to own the technical direction of a mission-critical messaging platform serving hundreds of healthcare organizations across the United States.THE ROLEOur client is a fast-growing, mission-driven organization transforming patient engagement at scale. They've built the leading platform powering communications for underserved populations, with proven impact reaching millions. Now they're looking for a seasoned backend engineer to lead their Messaging Team technical direction and mentor the next generation of engineering talent.You'll own complex features end-to-end, drive architectural decisions that shape how millions of patient communications are delivered, and share team lead responsibilities with your peers. This is a highly visible, technically autonomous role with direct impact on health equity outcomes.WHO WE'RE LOOKING FOR5+ years hands-on backend engineering with Ruby on Rails at scaleDeep experience building, maintaining, and scaling APIs and distributed systemsAdvanced SQL skills and comfort working with large, complex datasetsProven ability to independently own complex projects end-to-end and mentor junior engineersData-driven mindset you rely on evidence, not intuitionExcellent communicator (especially in fully remote environments)Passionate about mission-driven work and advancing health equityBONUS POINTSExperience with Twilio, RCS, or MMS messaging platformsFamiliarity with healthcare compliance (TCPA, consent workflows, carrier regulations)Tech stack: React, PostgreSQL, Google Cloud, SidekiqEvent-driven architecture or high-throughput message delivery pipelinesWHAT YOU'LL DOOwn and drive the technical direction of key messaging platform featuresDesign and build backend messaging systems (delivery pipelines, consent management, scheduling orchestration, API integrations)Mentor L2 engineers, lead technical design discussions, and set engineering standardsContribute to architectural decisions that shape messaging infrastructure at scaleParticipate in on-call rotations (PagerDuty) and help improve team processesWork cross-functionally with Product, Customer Success, and Data teamsYOUR IMPACTMonth 1: Master the platform architecture and contribute to technical design discussionsMonth 3: Independently deliver complex features with meaningful impact on patient outcomesMonth 6: Be recognized as a technical leader driving strategic initiatives across the engineering department