Principal Fullstack Engineer (AI) - Boston

About the role

Relocation package: Available
Start date: ASAP
Languages: English (required)

What You’ll Do

• Design, build, and maintain scalable full stack applications using Node.js, React, and TypeScript.
• Arcitect and develop robust backend services, APIs, and data models.
• Build modern, production-grade web interfaces with React.
• Own features end to end, from technical design and implementation to deployment and production support.
• Optimize performance across the stack (frontend rendering, API latency, database queries).
• Collaborate closely with product, design, and AI/ML teams to ship user-facing features.
• Establish best practices around testing, code quality, observability, and CI/CD.
• Improve overall system architecture, scalability, and developer experience.
• Debug and resolve production issues across both frontend and backend systems.

What We’re Looking For

• 5+ years of experience as a Full Stack Engineer.
• Strong proficiency in Node.js (Express, NestJS, or similar frameworks).
• Strong proficiency in React and TypeScript in production environments.
• Experience designing RESTful APIs and working with databases (PostgreSQL, MongoDB, or similar).
• Solid understanding of modern web architecture and distributed systems fundamentals.
• Experience building scalable, secure, and high-performance applications.
• Familiarity with cloud environments (AWS, GCP, or Azure).
• Comfortable owning features and shipping to production independently.
• Strong collaboration skills across product, design, and backend/ML teams.

Bonus Points

• Experience building data-heavy dashboards or real-time web applications.
• Familiarity with modern state management solutions (Redux, Zustand, React Query).
• Experience with event-driven architectures or message queues.
• Exposure to AI-driven or ML-powered products.
• Startup experience or comfort working in fast-moving, ambiguous environments.

Why This Role Will Pivot Your Career

• Research pedigree: MIT CSAIL founders with deep AI and systems expertise.
• Customer impact: Build products used by Fortune 500 clients.
• Industry momentum: Alumni behind major acquisitions (MosaicML → Databricks, Run:AI → NVIDIA, W&B → CoreWeave).
• Funding & growth: Oversubscribed seed round, next funding planned for 2026.
• Ownership: Lead full stack architecture and mission-critical product features.
• Engineering depth: Work on challenging scalability, performance, and AI infrastructure problems.