Seeking a Senior Software Engineer (IC4) to lead large, ambiguous projects end-to-end, architect scalable cloud-native systems, and raise technical standards across a full-stack platform. Responsibilities include system design (ADRs), performance optimization, secure SDLC and threat modeling, incident response, mentoring engineers, and using AI tools to accelerate development. Core qualifications: 5+ years professional experience and strong full-stack and distributed systems background (experience with AWS, serverless, containers, and healthcare standards such as FHIR/HL7 is a plus).