Principal Fullstack Engineer (AI) - Boston

Role Summary

• Location: Cambridge, MA (Eastern Time / UTC -4)
• Relocation package: Available
• Start date: ASAP
• Languages: English (required)

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.

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.

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.

Benefits

• Competitive salary & equity options
• Sign-on bonus
• Health, Dental, and Vision
• 401(k)

Pragmatike is an Equal Opportunity Employer and is committed to providing equal employment opportunities to all applicants without discrimination. We recruit on behalf of our clients and prohibit discrimination and harassment based on race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state, or local laws. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation, and training.We are committed to a fair and inclusive hiring process. We process your personal data solely for recruitment purposes, in accordance with applicable privacy laws, and maintain reasonable safeguards to protect your information. Your data may be shared with our client(s) for hiring consideration, but will not be disclosed to third parties outside of the recruitment process.

About the Company

Our client is one of the very few companies worldwide to control the entire AI infrastructure value chain, from energy through to orchestration software. You will join a team deploying a tangible technology, modular units operational within months, on an ambitious growth trajectory toward becoming one of the largest distributed infrastructure networks globally. Expect real autonomy from day one, direct access to clients and group leadership, and the opportunity to build the financial foundations of a company building something that doesn't exist yet.

Pragmatike is dedicated to a fair, transparent, and inclusive recruitment process. We ensure that no applicant is discriminated against based on age, disability, gender, gender identity or expression, marital or civil partner status, pregnancy or maternity, race, religion or belief, sex, or sexual orientation. In accordance with the General Data Protection Regulation (GDPR), your personal data will be processed lawfully, fairly, and securely. We collect and use your personal data solely for recruitment purposes, including sharing it with our client(s) for employment consideration. You have the right to request access, correction, or deletion of your data at any time. We are committed to maintaining the confidentiality and security of your information throughout the recruitment process.