Senior Backend Architect for AI Platforms

Flagship Pioneering; Cambridge (MA); On-site; USD 188,000 - 259,000; Full time

Job summary

Extuitive, backed by Flagship Pioneering, seeks a Principal Backend Engineer in Cambridge, MA to architect and scale core backend systems powering its AI-enabled platform. You will design high-throughput services, data pipelines, and real-time agent clouds, while guiding third-party integrations and security-driven architecture.

With 8+ years in backend engineering and proficiency in Node.js/TypeScript, Go, or Python, you’ll shape software culture, CI/CD, and observability in a fast-moving

Qualifications

• Bachelor’s degree in Computer Science, Software Engineering, or equivalent practical experience.
• 8+ years of backend engineering experience.
• Experience with high-velocity agentic coding under strict security requirements.
• 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.
• Comfortable working in a fast-paced, evolving environment with minimal oversight.

Responsibilities

• Architect, build, and scale core backend systems powering the platform.
• Design high-throughput services and real-time data pipelines.
• Lead third-party integrations with external providers.
• Ensure reliability, observability, and maintainability of services.
• Collaborate on architecture, coding standards, CI/CD and security.
• Wear multiple hats including DevOps and platform support.

Skills

Backend engineering

Distributed systems design

REST/GraphQL APIs

CI/CD practices

Security-minded

Node.js/TypeScript, Go, Python

Education

Bachelor’s degree in Computer Science / related field

Tools

Docker

Kubernetes

AWS

GCP

SQL/NoSQL

Job description

Extuitive, backed by Flagship Pioneering, seeks a Principal Backend Engineer in Cambridge, MA to architect and scale core backend systems powering its AI-enabled platform. You will design high-throughput services, data pipelines, and real-time agent clouds, while guiding third-party integrations and security-driven architecture.

With 8+ years in backend engineering and proficiency in Node.js/TypeScript, Go, or Python, you’ll shape software culture, CI/CD, and observability in a fast-moving