Principal Backend Engineer
Flagship Pioneering
September 02, 2026
Full-time
Remote friendly (Cambridge, MA)
Worldwide
IT
Role: Principal Backend Engineer leading the architecture, development, and scaling of core backend systems for an AI platform. Responsibilities: design high-throughput, resilient services; develop data pipelines; integrate with third-party providers; influence architecture standards; support DevOps and troubleshooting. Qualifications: 8+ years in backend engineering; expertise in languages like TypeScript, Go, Python; experience with distributed systems, microservices, APIs, SQL/NoSQL, cloud platforms (AWS/GCP), Docker/Kubernetes; strong testing and observability practices. Preferred: startup experience, experience with serverless architecture, scaling MVPs, and rapid feature deployment. High-Value: AI agent platform, high-velocity backend development, secure systems, data pipelines, third-party integrations. WorkSetup: remote or hybrid; no specific travel mentioned.