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Principal / Senior Software Engineer

Flagship Pioneering
August 25, 2026
Full-time
Remote friendly (Cambridge, MA)
Worldwide
IT
Role: Senior/Principal Software Engineer leading development of AI-enabled consumer applications within an early-stage bioplatform company. Responsibilities: design and implement customer-facing features across front-end and back-end stacks; collaborate with product managers, designers, and researchers to translate requirements into high-impact features; oversee full product lifecycle from discovery to iteration; manage release planning, feature flagging, and monitoring; leverage AWS infrastructure (ECS, S3, Lambda) to build scalable, secure applications; apply product analytics for continuous improvement; contribute to system architecture and UI/UX design; implement CI/CD, automated testing, and operational best practices; uphold data security, privacy, and compliance standards. Qualifications: 5+ years of software development experience with proven ability to build scalable, secure applications; proficiency in Python and AWS services; experience with cloud infrastructure, APIs, and system architecture; strong communication and collaborative skills; entrepreneurial mindset. Preferred: experience with large language models (LLMs), AWS certifications (Solutions Architect), AWS CDK, Typescript, and security best practices for SaaS. HighValue: AI-driven consumer health applications, cloud architecture, cross-disciplinary collaboration, fast-paced startup environment. Location: not specified; likely hybrid or remote.