Senior Full-Stack Engineer

US-only / No contractors / No recruiters

This is a senior 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 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 We Offer

• Salary: $120k – $200k

• 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 systems-design exercise — no leet code tricks; just high-level design and SQL pseudocode.

4. Choose one:

   1. 45-minute live React exercise to replicate a small UI, or

   2. 2-hour take-home project — build a simple React/React Native feature (cap of 2 hours)

5. References & final chats — meet another team member, ask any last questions, and wrap up logistics.