Founding Principal Full Stack Engineer

About the role

We are an early-stage startup building the operating system for psychotherapy practices. Our software helps therapists and practice owners understand how their business is performing, see what needs attention, and spend far less time on admin. We have raised over $5M, the team is six people in New York, and we are hiring our third engineer to own a major product vertical: practice analytics and insights. This is a founding engineer seat. You will work with the co-founders every day, own product areas outright, and shape both the product and the engineering culture from the ground up.

What You Will Do

• Own entire product verticals end to end: roadmap, architecture, execution and production operations
• Build AI-powered analytics and tooling that lets one practice operator support 40+ practices instead of 1-2
• Run parallel Claude Code and Codex agent sessions to ship at dramatically higher velocity
• Architect and deploy full-stack features in Python and React on AWS, with no dedicated DevOps support
• Make product decisions autonomously: spot the opportunity, form an opinion, ship it without waiting for a spec
• Build the EHR integrations and data layer that practice analytics runs on

What We Are Looking For

• 5-10+ years of full-stack engineering with real product ownership
• You have built and shipped a product end to end, zero to one, not just features inside a larger team
• Full-stack fluency across frontend and backend, built from scratch rather than maintained
• A sophisticated agentic AI workflow: Claude Code or Codex deeply integrated with parallel sessions and custom tooling, not casual copilot use
• Hands-on cloud infrastructure experience, AWS preferred, plus Docker
• High agency and an ownership mindset, and comfort with early-stage intensity
• Based in New York City or willing to relocate promptly. This role is five days a week in office

Nice to have

• Experience at a high-growth startup or a top-tier tech company
• You have built product-facing analytics features

Stack

Python, FastAPI, TypeScript, React, PostgreSQL, AWS (ECS, RDS, ElastiCache, EC2), Docker, Playwright, GitHub Actions, Claude Code, Codex.

Compensation

• $200K–$320K base salary depending on experience
• Meaningful equity, roughly 0.5%–1%
• Relocation support for candidates moving to New York
• Open to visa transfers such as OPT and H1B on a case-by-case basis