Senior 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 Senior Software Engineer to architect and scale Sully.ai’s platform-level agentic AI systems. 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:

• Senior-level full-stack experience in React, TypeScript, and Python.

• 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.

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.