Sully.ai Inc.
Senior Software Engineer, Research (Contract to Hire)
Sully.ai Inc., San Francisco, California, United States, 94199
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
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. Sully.ai 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 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
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
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.
#J-18808-Ljbffr
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
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. Sully.ai 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 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
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
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.
#J-18808-Ljbffr