Senior Software Engineer

About Sully.ai

At Sully.ai, we are building the most impactful healthcare company on Earth. We believe that access to a great doctor is a basic human right, a reality often hindered by delays, misdiagnoses, administrative chaos, and burnout in the current 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 in 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.ai requires A-players capable of 4 months = 1 year output. This role is structured as a Contract-to-Hire position with a 60-day trial period. Sully.ai maintains an exceptionally high performance bar, and this structure ensures mutual alignment before transitioning to full-time.

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.

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.

90 Day OKRs

• 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.

Key skills/competency

• Full-stack Development
• React
• TypeScript
• Python
• LLM Integration
• API Design
• Cloud Infrastructure (AWS/GCP/Azure)
• CI/CD Pipelines
• System Design
• Observability