Senior Backend Software Engineer

### Who you are
- 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
- You care deeply about API craftsmanship and long-term system design
- You’ve built complex systems that external customers rely on
- You enjoy modeling messy real-world data — especially high-frequency signals — into clean, durable abstractions
- You’ve built comprehensive search or RAG production systems at scale
- You’ve helped scale early systems from 1 → 10 in a fast-paced environment
- You thrive in small, high-leverage teams where ownership is real
- You have a track record of maintaining and up-leveling operational excellence across software organizations

### What the job involves
- We are seeking a talented, driven, and experienced Senior Backend Engineer to join us in defining the future of AI + human healthcare
- You will sit on our Platform & Integrations team and own the critical product primitives that the rest of the company builds on — including external APIs, health data models, retrieval infrastructure, and enterprise integrations
- This role is central to ensuring our platform scales seamlessly — supporting enterprise healthcare clients, powering AI-driven clinical workflows, and maintaining correctness and reliability across distributed systems
- Much of this surface area is greenfield, particularly in how we model and operationalize longitudinal health data from wearable devices and external systems
- Our culture is fast-paced and ambitious, and we aim for every team member to be exceptional
- Design and evolve our external API and embedded product layer, ensuring long-term stability, disciplined versioning, and enterprise-grade API craftsmanship
- Evolve our agentic retrieval harness to support both patient and clinical search workflows across structured and unstructured data, with strict permission and audit guarantees
- Build reusable platform primitives that allow external partners to embed and extend our AI capabilities — ensuring every integration produces lasting platform leverage
- Contribute to our core data models that unify structured health records, unstructured inputs, and high-frequency time-series signals
- Examples of projects you may work on
- Develop a pluggable ingestion framework that normalizes data from third-party sources into canonical internal models, with extensible adapters for new partner onboarding
- Build a stateful, multi-turn, agentic API that allows external clients to customize AI agent behavior and capabilities within their own cloud, deployment environments

### Benefits
- Significant opportunities for broad ownership and professional development
- Equity
- Comprehensive healthcare, vision + dental
- 401K
- Unlimited PTO
- Parental leave