Senior Software Engineer, Frontend & UI

About Us
👏 Team from OpenAI, DeepMind, NASA, GoogleX, Tesla, and 2 physicians: 6 exits, 2 IPOs.
🔥 Our model outperforms Claude, Gemini, and GPT-4.5 on clinical benchmarks.
📈 400+ healthcare orgs signed in 16 months.
⚡️ $25M raised from YC, Amity Ventures, Sequoia scouts, and more.
🌎 $1T+ market opportunity. We’re going after all of it.

About the Role
We are seeking a Senior Software Engineer to lead the development of Sully.ai’s user-facing interfaces. This role is deeply technical and design-driven: you will architect, build, and optimize our frontend systems to deliver intuitive, high-performance, and delightful user experiences. You’ll collaborate closely with design, product, and backend engineering to ensure our platform is not only functional but a joy to use.

Key Responsibilities

• Own the architecture and delivery of Sully.ai’s frontend applications, ensuring scalability, performance, and usability.
• Collaborate with product and design to translate complex workflows into simple, elegant interfaces.
• Mentor junior engineers and establish frontend best practices, testing frameworks, and coding standards.
• Optimize load times and responsiveness across web and mobile platforms.
• Partner with backend teams to ensure seamless API integrations and data handling.

Hard Requirements

• 6+ years of experience in frontend engineering, with mastery of React (or equivalent modern framework).
• Proven track record of building and scaling production-grade applications with high usage.
• Strong expertise in TypeScript, state management, and modern frontend tooling.
• Deep understanding of accessibility, responsive design, and performance optimization.
• Experience collaborating with designers and backend engineers in fast-paced environments.
• Background in healthcare or enterprise SaaS applications.
• Experience with real-time data visualization (charts, dashboards, metrics).
• Contributions to open-source frontend frameworks or libraries.
• Audit and document the current frontend codebase and architecture.
• Deliver improvements to performance and UI responsiveness (baseline metrics established).
• Build a shared component library to drive UI consistency across teams.
• Success OKRs (90 Days)

Nice-To-Have

First-Month Focus

• Reduce frontend load times by 30% across key user workflows.
• Deliver at least 2 new major customer-facing UI features with measurable adoption (≥80% usage in pilot accounts).
• Implement automated testing coverage for >70% of frontend code, reducing regression bugs by at least 40%.

Culture Fit

• Persistent, driven problem solver
• Willing to push back on leadership to defend quality/timelines
• Thrives in high-ambiguity, fast-paced startup environments
• Why Join Sully.ai?
• 🔥 Shape the Future of Healthcare: Build category-defining partnerships that enable doctors to focus on saving lives.
• 📈 Early-Stage Impact: Join early and play a critical role in shaping our partnership roadmap and overall company growth.
• 🌎 Remote-First Culture: Work with a talented, mission-driven team in a flexible, remote environment.
• 💰 Competitive Compensation: Enjoy a competitive salary, equity, and the opportunity to make a real difference.
• 🏆 Solve Scalability Challenges: Tackle complex challenges in a rapidly growing company, driving impactful change in healthcare.

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.