Senior Software Engineer, Research
Senior Software Engineer, Research at Sully.ai — Mountain View, CA, US
- Company: Sully.ai
- Location: Mountain View, CA, US
- Employment type: FULL_TIME
- Salary: USD 175000–220000 / year
- Posted: 2026-07-17
About this role
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.
What You’ll Do
Build and optimize core research infrastructure: evaluation pipelines, agent workflows, hallucination detectors, coding benchmarks, and research→production integrations.
Design, implement, and scale agentic systems across backend, frontend, and model integrations, collaborating closely with research and co-founders.
Own reliability, observability, and performance across agents (logging, tracing, instrumentation, safety checks).
Ship research-proven features into production within 7 days, end-to-end.
Develop shared tools, SDKs, and internal products that accelerate iteration across Research, QA, and Engineering.
What You Must Bring
Senior-level full-stack engineering experience in React, TypeScript, and Node.js.
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 all cross-agent flows for UI/UX consistency, correctness, and performance gaps.
Implement shared components, typed schemas, and contract-driven interfaces for reliability.
Establish instrumentation for frontend performance, agent consistency, latency, and model round-trip tracing.
Improve or replace brittle evaluation or agent pipelines identified during onboarding.
Partner with Research to productionize at least one new capability.
90 Day OKRs
Deliver production-grade agentic workflows with <5% error rates across evaluation benchmarks.
Launch a cross-agent design system + SDK adopted by at least 2 internal teams.
Establish a weekly deploy + measure cadence with performance dashboards, latency budgets, and error budgets.
Reduce agent latency and failure rates across at least two high-volume workflows.
Ship multiple research-to-production integrations with measurable CSAT or accuracy gains.
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