Senior Software Engineer, Research

Department: Engineering

Location: US - Bay Area

Employment Type: FullTime

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 enable our customers to staff 30% of their workforce with AI by creating a shared agent architecture for scale and efficiency. All powered by our own patented, world-class models and deployed in real-world care.

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.

Hard Requirements

• 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.

Key Results (First 90 Days)

• Deliver production-grade agentic workflows with end-to-end testing.

• 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.

• Partner with Research to productionize at least one new capability.

Why Join Sully.ai?
🔥 Revolutionizing the antiquated $800B+ Healthcare market

🧠 60%+ Ex-founders who have built, scaled, exited. We hire A-players

⚡️ 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 directly unlocks doctors to 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.