Staff Full-Stack Engineer

US-only / No contractors / No recruiters This is a senior/staff position; we are not currently offering junior roles. About Rythm Health Rythm Health sends you an easy, painless at-home kit to collect your own blood sample. Your results show up in a private, HIPAA-compliant dashboard, where you can see how your biomarkers change over time and learn what they mean for your health. Our Tech Stack - TypeScript end-to-end - Express + React Router 7 (web) - tRPC - React Native (mobile) - React Query - Postgres + Redis What You’ll Do - Own features end-to-end — from design discussion to production rollout and monitoring. - Ship TypeScript on the web app, Node/Express backend, and/or mobile app. - Contribute to (or learn) React Native. - Design and build fault-tolerant, HIPAA-compliant services with a strong focus on privacy, security, and stability. - Document your work so others can move fast. - Be a great generalist across our stack OR an expert in a few areas. - Use the latest AI tools and SDKs to build AI-enriched features. You’re a great fit if you… - Live and work in the U.S. and communicate clearly in English. - Bring 5+ years of hands-on software experience, with advanced TypeScript skills. - Are comfortable working in a fast-paced startup where procedures aren't clearly defined. - Have built some great things you can show us and describe in detail. - Manage your own time, break down ambiguous problems, and deliver. - Use AI tools as an accelerator—never as the decision-maker. - Have experience with React Router, Next.js, or similar frameworks. - Understand backend design and data modeling in SQL/Postgres. - Are not submitting an AI resume. (If you are human, please say so in your application) - Have written reliable tests with Vitest, Cypress, Jest, etc. You’re an excellent fit if you… - Have used AI SDKs (AI SDK, OpenAI, Anthropic, etc.) with production software. - You have built or maintained HIPAA-compliant or other regulated healthcare software. - Are comfortable with internal tooling (e.g., Retool) and thorough documentation habits. - Bring deeper expertise in React Native or sophisticated systems architecture. - Are comfortable with monorepos. What We Offer - Salary: $160k – $220k - Equity: 0.05 % – 0.25 % - Benefits: Health, Dental, Vision - Time Off: Flexible PTO - Work Setup: Fully remote Hiring Process If you have a better way to showcase your abilities and what you've built, let us know. 1. Answer a few quick questions here: https://meritfirst.us/candidate/tests/45396b4d-d240-41cf-bb39-fcdc5544353d 2. 20-minute intro call with Dac (Co-Founder & CTO) — chat about Rythm, the role, and your goals. 3. 60-minute frontend/backend-design exercise — no leet code tricks 4. 60-minute systems-design exercise 5. References & final chats — meet another team member, ask any last questions, and wrap up logistics.