Principal Fullstack Engineer (AI) - Boston
External
Pragmatike · Cambridge, UKPrepare for this interview
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About the role
Pragmatike is hiring on behalf of a fast-growing AI startup recognized as a Top 10 GenAI company by GTM Capital, founded by MIT CSAIL researchers. We are searching for a Senior Full Stack Engineer (Node.js + React) with strong hands-on experience building scalable, high-performance web applications powering complex, data-intensive AI products used by Fortune 500 customers. This role is ideal for an engineer who enjoys owning features end to end-from backend architecture to polished frontend delivery-someone who can design APIs, build scalable services, craft intuitive user interfaces, and ship production-ready features at scale.
Responsibilities
- Design, build, and maintain scalable full stack applications using Node.js, React, and TypeScript .
- Architect 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.
Requirements
- 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.
Benefits
Additional Information
Location: Cambridge, MA (Eastern Time / UTC -4) Relocation package: Available Start date: ASAP Languages: English (required)
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