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 ROLE Our 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 FOR 5+ years hands-on backend engineering with Ruby on Rails at scale Deep experience building, maintaining, and scaling APIs and distributed systems Advanced SQL skills and comfort working with large, complex datasets Proven ability to independently own complex projects end-to-end and mentor junior engineers Data-driven mindset you rely on evidence, not intuition Excellent communicator (especially in fully remote environments) Passionate about mission-driven work and advancing health equityBONUS POINTS Experience with Twilio, RCS, or MMS messaging platforms Familiarity with healthcare compliance (TCPA, consent workflows, carrier regulations) Tech stack: React, PostgreSQL, Google Cloud, Sidekiq Event-driven architecture or high-throughput message delivery pipelinesWHAT YOU'LL DO Own and drive the technical direction of key messaging platform features Design and build backend messaging systems (delivery pipelines, consent management, scheduling orchestration, API integrations) Mentor L2 engineers, lead technical design discussions, and set engineering standards Contribute to architectural decisions that shape messaging infrastructure at scale Participate in on-call rotations (PagerDuty) and help improve team processes Work cross-functionally with Product, Customer Success, and Data teamsYOUR IMPACT Month 1: Master the platform architecture and contribute to technical design discussions Month 3: Independently deliver complex features with meaningful impact on patient outcomes Month 6: Be recognized as a technical leader driving strategic initiatives across the engineering department