Senior Software Engineer, Research

Posted 8 Days Ago
7 Locations
In-Office or Remote
Senior level
Artificial Intelligence • Healthtech
The Role
Build and scale core research infrastructure and agentic systems across backend, frontend, and model integrations. Own reliability, observability, and performance; ship research-proven features to production rapidly and develop shared tools and SDKs to accelerate Research, QA, and Engineering.
Summary Generated by Built In

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.
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.

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

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. 

Top Skills

React,Typescript,Node.Js,Large Language Models (Llms),Api Design,Streaming,Ci/Cd,Aws,Gcp,Azure,Sdks,Logging,Tracing,Instrumentation
Am I A Good Fit?
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The Company
HQ: Mountain View, California
60 Employees
Year Founded: 2023

What We Do

Superhuman medical staff that’s 10x better, 20x cheaper, and 100x faster.

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