Staff Full-Stack Engineer US-only / No contractors / No recruitersThis is a senior/staff position; we are not currently offering junior roles.About Rythm HealthRythm 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 StackTypeScript end-to-endExpress + React Router 7 (web)tRPCReact Native (mobile)React QueryPostgres + RedisWhat You’ll DoOwn 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 OfferSalary: $160k – $220kEquity: 0.05 % – 0.25 %Benefits: Health, Dental, VisionTime Off: Flexible PTOWork Setup: Fully remoteHiring Process If you have a better way to showcase your abilities and what you've built, let us know.Answer a few quick questions here: https://meritfirst.us/candidate/tests/45396b4d-d240-41cf-bb39-fcdc5544353d20-minute intro call with Dac (Co-Founder & CTO) — chat about Rythm, the role, and your goals.60-minute frontend/backend-design exercise — no leet code tricks60-minute systems-design exerciseReferences & final chats — meet another team member, ask any last questions, and wrap up logistics.