Senior Software Engineer (Backend)

Senior Backend EngineerWe'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.What You'll DoDesign and evolve our external API and embedded product layer with long-term stability, disciplined versioning, and enterprise-grade craftsmanshipEvolve our agentic retrieval harness to support patient and clinical search across structured and unstructured data, with strict permission and audit guaranteesBuild reusable platform primitives that let external partners embed and extend our AI capabilities, so every integration adds lasting platform leverageContribute to core data models that unify structured health records, unstructured inputs, and high-frequency time-series signalsWho You AreCares deeply about API craftsmanship and long-term system designHas built complex systems that external customers rely onEnjoys modeling messy real-world data, especially high-frequency signals, into clean, durable abstractionsHas built comprehensive search or RAG systems at production scaleHas helped scale early systems from 1 to 10 in a fast-paced environmentThrives in small, high-leverage teams where ownership is realHas a track record of maintaining and leveling up operational excellence across engineering organizationsWhat You Bring5+ years building production backend systems, ideally in high-growth environmentsExperience designing and maintaining external-facing APIs used by customers or partnersStrong data modeling instincts, particularly around time-series or high-frequency dataExperience working with distributed systems and multi-tenant architecturesComfort contributing to greenfield architectural design while shipping pragmaticallyRole Location:NYC - hybrid, Boston - hybrid, or East Coast - remoteWhat We OfferImpact: Be at the forefront and contribute to groundbreaking, AI-driven healthcare experiences, directly interface with execs at the world's leading tech & healthcare orgsGrowth: Significant opportunities for broad ownership and professional development within our rapidly scaling startupCompensation: Competitive salary + equityBenefits: Comprehensive healthcare, vision + dental, 401K, Unlimited PTO, Parental LeaveOur ValuesPatients Come First: We are clinicians 1st, technologists 2nd. We act with patient trust/safety at the center of every decision.Innovate with Optimism: We are optimistic as we build the future of care delivery from first principles. Challenge the status quo when needed, no sacred cows.Right Answer Wins: Debate openly and pick the strongest path. We optimize for the company, not functions. We win and lose as a team.Simplicity Over Complexity: We choose clear, elegant solutions and avoid adding complexity that does not serve patients or the team.Do Fewer Things, Well: We focus, and hold ourselves to the highest bar and pursue excellence in those areas.