Hiring: Principal Backend Engineer Company: Flagship Pioneering Location: Cambridge, MA Job Posted Time: 2026-09-02 17:58:09 Employment Type: Full-time Target Skills & Keywords: Backend Engineering, Distributed Systems, Microservices, Event-Driven Architecture, AI Agents, Data Pipelines, Node.js, TypeScript, Go, Python, REST/GraphQL APIs, Webhooks, SQL/NoSQL, AWS, GCP, Docker, Kubernetes, CI/CD, Observability, Third-Party Integrations Experience: - 8+ years of backend engineering experience - Experience with high velocity agentic coding under strict security requirements - Bachelor's degree in Computer Science, Software Engineering, or equivalent practical experience - Comfortable working in a fast-paced, evolving environment with minimal oversight Required Skills: - Strong expertise in backend languages and frameworks (Node.js/TypeScript, Go, Python, or similar) - Experience designing scalable distributed systems, microservices, and event-driven architectures - Deep experience with third-party integrations, REST/GraphQL APIs, webhooks, and rate-limited services - Proficiency with SQL/NoSQL databases, data pipelines, and performance optimization - Familiarity with cloud platforms (AWS, GCP) and containerized/deployed systems (Docker, Kubernetes) - Strong testing, CI/CD, and observability practices Qualifications: - Proven ability to architect, build, and scale core backend systems and high-throughput services - Experience building and maintaining large-scale, resilient data pipelines for ingestion, transformation, and analytics - Ability to lead third-party integrations with reliability, observability, and long-term maintainability - Track record of influencing backend architecture, coding standards, testing frameworks, and CI/CD pipelines - Willingness to wear multiple hats, supporting DevOps, troubleshooting, and other platform needs - Nice to Have: Early-stage startup experience, exposure to multiple backend domains (analytics, payments, notifications, workflow orchestration), serverless/edge architectures, low-friction SaaS integrations, scaling systems from MVP to production, comfort with ambiguity and trade-offs between speed, quality, and maintainability Compensation: Not specified Interested candidates, please apply directly through the job posting on company's career page or try via AI auto apply on this platform. Don’t miss this opportunity to join a forward-thinking team!