At Inflection AI, our public benefit mission is to harness the power of AI to improve human well-being and productivity.

The next era of AI will be defined by agents we trust to act on our behalf.

We’re pioneering this future with human-centered AI models that unite emotional intelligence (EQ) and raw intelligence (IQ)—transforming interactions from transactional to relational, to create enduring value for individuals and enterprises alike.

Our work comes to life in two ways today:

Pi, your personal AI, designed to be a kind and supportive companion that elevates everyday life with practical assistance and perspectives.

Platform — large-language models (LLMs) and APIs that enable builders, agents, and enterprises to bring Pi-class emotional intelligence into experiences where empathy and human understanding matter most.

We are building toward a future of AI agents that earn trust, deepen understanding, and create aligned, long-term value for all.

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 $200,000 to $300,000, 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