Staff Software Engineer Full Stack & AI Systems

About Us At Sully.ai , We’re Building the Most Impactful Healthcare Company on Earth We believe that access to a great doctor is a basic human right. Today, that’s not a reality. Delays, misdiagnoses, administrative chaos, and burnout plague the system. Our Mission: One Human, One Doctor . We build AI teammates that augment clinicians — scribes, nurses, receptionists, translators — all powered by our own world-class models and deployed in real-world care. Our Traction 450+ organizations signed 16 months AI agents cut admin by ~2.8 hours daily and reduce onboarding 85%. 5M+ Clinical Tasks completed to date, serving 36+ specialties. Raised $25M from YC, Eric Yuan, Amity, Semper Virens Patented AI architecture (MedCon-1) outperforms GPT-4.5, Gemini, Claude on clinical reasoning tasks Sully requires A-players capable of 4 months = 1 year output. About the Role We are seeking a Staff Software Engineer to architect and scale Sully.ai ’s platform-level agentic AI systems within our Engineering Research team. This role combines full-stack engineering excellence with deep expertise in LLM-powered experiences. You’ll design, implement, and optimize core components across frontend, backend, and model integrations, while driving engineering direction in close collaboration with our co-founders. Your work will directly shape the reliability, speed, and cohesion of Sully.ai ’s multi-agent ecosystem. What You'll Do: Architect and implement cross-agent systems that power core Sully.ai experiences. Build and scale full-stack product components using TypeScript/React and Python services. Integrate LLMs into production workflows with strong contracts, observability, and test coverage. Develop shared UI components and typed SDKs to unify cross-agent experiences. Lead engineering direction, collaborating with founders and cross-functional stakeholders. What You Must Bring: Staff/Principal-level full-stack experience in React, TypeScript, and Node. Proven ability to design, ship, and scale LLM-powered applications. Expertise in API design, streaming, and CI/CD pipelines. Strong cloud infrastructure background (AWS, GCP, or Azure). Track record of building reliable systems with measurable performance and error budgets. Nice-to-Have Experience with WebRTC or audio-aware UI design. Hands-on work with agentic AI frameworks. History of creating design tokens, SDKs, or cross-agent platforms. First-Month Focus Audit current cross-agent flows for UI/UX cohesion. Implement shared components and typed contracts for reliability. Establish instrumentation for frontend performance and model round-trip tracing. Success OKRs (90 Days) Deliver end-to-end tested, production-grade agentic workflows with <5% error rates. Launch cross-agent design system and SDK used by at least 2 internal teams. Establish weekly “deploy and measure” cadence with performance metrics and error budgets. If you’ve ever said, “ I want to do work that actually matters ”, this is it. Let’s build something life-changing, together. Who Thrives Here Entrepreneurial to your core : You think in outcomes, thrive in chaos, and take ownership without limits Mission-obsessed : You’re here to save lives, not just ship features — patients and doctors are your why. Impact-driven & fast-moving : You sprint toward hard problems and ship with sharp judgment. Elite teammate : You raise the bar through high standards, direct feedback, and craft excellence. Why Join Sully.ai ? 🔥 Revolutionizing the antiquated $800B+ Healthcare market 🧠50%+ of us are ex-founders. We hire A-players, not passengers ⚡️ Speed matters - we operate with urgency, autonomy, and ownership 🧪 You’ll work on real, first-of-their-kind problems at the edge of AI and medicine ❤️ Your work helps doctors reclaim their time - and patients get better, faster care Sully.ai is an equal opportunity employer. In addition to EEO being the law, it is a policy that is fully consistent with our principles. All qualified applicants will receive consideration for employment without regard to status as a protected veteran or a qualified individual with a disability, or other protected status such as race, religion, color, national origin, sex, sexual orientation, gender identity, genetic information, pregnancy or age. Sully.ai prohibits any form of workplace harassment.  Please mention the word **UPBEAT** and tag RMjYwNzo1MzAwOjIwZDo3ZDAwOjo= when applying to show you read the job post completely (#RMjYwNzo1MzAwOjIwZDo3ZDAwOjo=). This is a beta feature to avoid spam applicants. Companies can search these words to find applicants that read this and see they're human.