Full-Time 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 â lscribes, nurses, receptionists, translators â lall 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

What is the last date for applying to the job?

Which countries are accepted for this remote job?