Senior Software Engineer (Backend)

We're looking for a Senior Backend Engineer to help define the future of AI-powered, human-led healthcare. You'll sit on our Platform & Integrations team, owning the core product primitives the rest of the company builds on: external APIs, health data models, retrieval infrastructure, and enterprise integrations.

This role is central to scaling our platform: supporting enterprise healthcare clients, powering AI-driven clinical workflows, and keeping distributed systems correct and reliable. Much of this is greenfield, especially how we model and operationalize longitudinal health data from wearables and external systems.

- Design and evolve our external API and embedded product layer with long-term stability, disciplined versioning, and enterprise-grade craftsmanship

- Evolve our agentic retrieval harness to support patient and clinical search across structured and unstructured data, with strict permission and audit guarantees

- Build reusable platform primitives that let external partners embed and extend our AI capabilities, so every integration adds lasting platform leverage

- Contribute to core data models that unify structured health records, unstructured inputs, and high-frequency time-series signals

- Cares deeply about API craftsmanship and long-term system design

- Enjoys modeling messy real-world data, especially high-frequency signals, into clean, durable abstractions

- Has built comprehensive search or RAG systems at production scale

- Has helped scale early systems from 1 to 10 in a fast-paced environment

- Thrives in small, high-leverage teams where ownership is real

- Has a track record of maintaining and leveling up operational excellence across engineering organizations

- 5+ years building production backend systems, ideally in high-growth environments

- Experience designing and maintaining external-facing APIs used by customers or partners

- Strong data modeling instincts, particularly around time-series or high-frequency data

- Experience working with distributed systems and multi-tenant architectures

- Comfort contributing to greenfield architectural design while shipping pragmatically