Senior Software Engineer, Research

About Us At Sully.ai http://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 http://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.