Senior Fullstack Engineer for a Series A Health Tech Startup

We are searching for a Senior Fullstack Engineer to join a fast-growing Series A health technology startup focused on at-home monthly blood testing and health insights. They have raised a total of over $24 million across three funding rounds, with its latest round in November 2025 raising $19 million. Their main product is an easy, painless at-home kit for collecting your own blood sample. Your results appear in a private, HIPAA-compliant dashboard where you can track your biomarker changes over time and understand their implications for your health. The 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… • Bring 4+ 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 They Offer • Salary: $120k – $200k • Equity: 0.05 % – 0.25 % • Benefits: Health, Dental, Vision • Time Off: Flexible PTO • Work Setup: Fully remote Apply tot his job