Web Fullstack Architect

About the Role

As a Principal Fullstack Architect for Pi, you will own the technical architecture and execution of our end-to-end product experience—from a highly scalable React and Next.js frontend to performant, reliable backend systems that power AI-driven interactions. This is a deeply hands-on role for an experienced engineer who leads by example, writes production code daily, and sets a high bar for engineering quality. You will partner closely with product, design, backend, and ML teams to evolve Pi’s architecture, ensure long-term maintainability, and mentor engineers as we scale a product used by millions of people worldwide.

What You’ll Do

• Own and evolve the end-to-end architecture for Pi’s web product, spanning frontend, backend services, and supporting infrastructure
• Write high-quality, production code across the stack, with a strong focus on React, Next.js, TypeScript, and modern backend frameworks
• Set and enforce best practices for code quality, system design, testing, performance, and reliability through hands-on leadership and reviews
• Collaborate closely with backend and ML engineers to design APIs, data models, and workflows for low-latency, AI-powered experiences
• Make pragmatic architectural decisions that balance speed, scalability, cost, and long-term maintainability as the product grows
• Mentor and guide engineers across the team, helping them improve technical judgment, system design skills, and ownership
• Identify technical risks early and influence product and engineering roadmaps with clear tradeoff analysis
• Improve developer experience through better tooling, CI/CD, observability, and operational practices

What We’re Looking For

• 10+ years of professional software development experience, including senior, staff, or principal roles in fast-moving or high-growth environments
• Strong hands-on experience building full-stack systems at scale, with deep expertise in modern frontend technologies (React, Next.js, TypeScript)
• Solid backend experience in Python (FastAPI/Django) and/or Node.js, including API design, async workflows, and background processing
• Proven track record in building and operating products used by thousands to millions of users in production
• Experience designing and evolving system architectures over time, from early MVPs to large-scale, modular systems
• Familiarity with cloud infrastructure (AWS, GCP, or Azure), containerized deployments, and production operations
• Ability to collaborate effectively with product, design, and ML teams to turn ambiguous ideas into shipped features
• Have a bachelor’s degree or equivalent in a related field to the offered position requirements

Employee Pay Disclosures

At Inflection AI, we aim to attract and retain the best employees and compensate them in a way that appropriately and fairly values their individual contributions to the company. For this role, Inflection AI estimates a starting annual base salary to fall within the range of $175,000 to $250,000, depending on a candidate’s qualifications and level of experience. This role also includes a meaningful equity component, allowing employees to share in the long-term success of the company.

Benefits

Inflection AI values and supports our team’s mental and physical health. We are focused on building a positive, safe, inclusive and inspiring place to work. Our benefits include: 

• Diverse medical, dental and vision options 
• 401k matching program 
• Unlimited paid time off 
• Parental leave and flexibility for all parents and caregivers
• Support of country-specific visa needs for international employees living in the Bay Area