Senior Software Engineer, Research

About Us
At ,
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.
This role is structured as a Contract-to-Hire position with a 60-day trial period.
maintains an exceptionally high performance bar, and this structure ensures mutual alignment before transitioning to full-time
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
• 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