AI Full Stack Engineer

Infinitus Systems · San Francisco

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Help Build the Future of Healthcare AI

Infinitus is AI communications in service of patients.

Healthcare is inherently complex and siloed. We’re pioneering agentic communications to connect the entire system — any stakeholder, any channel, inbound and out. The result is intelligent care that reduces patient anxiety, increases speed to treatment, and enables teams to scale impact without stretching resources.

Our system combines industry-leading safety guardrails with the largest dynamic knowledge graph built on millions of real-world interactions. It’s why 44% of the healthcare Fortune 50 trusts Infinitus to turn fragmented touchpoints into seamless care for better patient outcomes.

The Mission

At Infinitus, our mission is simple: create time for healthcare by making access, adherence, and affordability easier than ever. We’ve automated over 7 million calls and 100M+ minutes of conversation — saving millions of hours for patients and providers.

Backed by over $100M from top investors including Google Ventures, Kleiner Perkins, Andreessen Horowitz, and Coatue, we’re a team that challenges the status quo and moves fast at the intersection of AI and healthcare. Infinitus was recently named to Fast Company's World's Most Innovative Companies and Business Insider’s top startups in healthcare.

Your Role

We are looking for a senior Fullstack Software Engineer to help us design, build, and scale the core of our digital health platform. You’ll work on expanding the capabilities of Eva, our AI-powered health assistant, and build systems that automate and simplify healthcare administration at scale. This role blends hands-on backend development with opportunities to lead and influence technical direction and mentor teammates.

Your Impact

• Design, build, and scale AI-powered, user-facing products that make Eva’s healthcare interactions more intelligent, intuitive, and reliable.

• Lead the end-to-end delivery of complex full-stack product experiences, from frontend architecture and backend services to APIs, data integrations, and production workflows.

• Partner closely with Product, Design, Data Science, Infrastructure, and other engineering teams to bring AI capabilities into real user workflows in a practical, scalable, and measurable way.

• Translate ambiguous product and AI opportunities into clear technical plans, balancing speed, user experience, reliability, safety, and long-term maintainability.

• Build robust systems that connect application logic, data pipelines, model outputs, and human-centered product experiences.

• Evaluate and integrate AI technologies, including LLM-enabled workflows, retrieval systems, classification, summarization, automation, and decision-support experiences where appropriate.

• Establish strong frontend and backend engineering standards, including component architecture, API design, system reliability, observability, testing, and development best practices.

• Make high-quality technical tradeoffs across product impact, engineering complexity, scalability, and long-term platform health.

• Drive cross-team and cross-org alignment to ship high-impact work, influencing through technical clarity, judgment, and collaboration rather than authority.

• Mentor and grow engineers across the team, raising the bar for technical execution, product thinking, and engineering culture.

• Contribute to both short- and long-term technical roadmaps, especially around AI-enabled product development, platform scalability, and full-stack architecture.

• Help shape how Eva responsibly applies AI in healthcare workflows, with a focus on usefulness, trust, reliability, and excellent user experience.

Your Skillset

• 8+ years of practical full-stack engineering experience

• A track record of leading the design and delivery of complex consumer or B2B user-facing products across the full stack.

• Deep expertise in modern frontend and backend development, with strong proficiency in technologies such as React, TypeScript, Python, Go, Java, C++, or similar.

• Strong experience designing scalable APIs, backend services, data models, integrations, and distributed systems.

• Hands-on experience with cloud infrastructure and modern DevOps practices, ideally across AWS, GCP, or similar environments.

• Solid understanding of database technologies, including SQL and NoSQL systems, with experience optimizing for performance, reliability, and scale.

• Practical familiarity with AI-enabled product development, such as LLM integrations, model orchestration, prompt/system design, retrieval-augmented generation, evaluation workflows, or AI-assisted automation.

• Strong product judgment and a user-centered approach to building solutions that are robust, scalable, trustworthy, and easy to use.

• Experience working in early-stage startups or similarly fast-moving, rapidly evolving environments; ideally, you have built products from 0 to 1.

• Ability to navigate ambiguity, define technical direction, and deliver high-quality products in fast-paced environments.

• Demonstrated success driving cross-team or cross-org alignment to get impactful work shipped.

• Experience establishing engineering standards, component architectures, reusable patterns, and development best practices.

• Leads through mentorship, actively developing peers and junior engineers while fostering a collaborative, high-performing engineering culture.

• Entrepreneurial mindset: you take initiative, operate with ownership, and drive projects from concept through production impact.

Nice to Have

• Experience building AI-powered products in healthcare, fintech, enterprise SaaS, or other high-trust domains.

• Experience with evaluation, monitoring, and reliability practices for AI systems in production.

• Familiarity with healthcare data, clinical workflows, privacy-sensitive systems, or regulated environments.

• Experience building internal platforms or tooling that accelerate AI product development across engineering teams.

Why You’ll Love It Here

Please Note: the following benefits are for salaried employees

• Hybrid work (SF office Mon/Tues/Thurs) + catered lunches (Bay Area Positions only)

• Competitive salary, equity, and 401(k)

• Wellness stipend & great benefits (medical, dental, vision)

• Generous PTO & parental leave

• Bi-annual offsites & a collaborative, mission-driven culture
  

What to Expect in the Interview Process

• Apply & meet our recruiting team

• Virtual interviews to showcase your skills

• Final onsite loop to meet the team and get to know us better

• Chat with our CEO
  

Curious to Learn More?

• Read our Blog to hear from Infinauts about what we’re building

• Discover how our company values (CODES) guide us

• Follow our CEO, Ankit Jain, for industry updates
  

We’re building AI agents that tackle healthcare’s toughest problems and open new possibilities. Ready to join us? Let’s talk!

​​Infinitus Systems is committed to providing an environment of mutual respect where equal employment opportunities are available to all applicants and teammates without regard to race, color, religion, sex, pregnancy (including childbirth, lactation and related medical conditions), national origin, age, physical and mental disability, marital status, sexual orientation, gender identity, gender expression, genetic information (including characteristics and testing), military and veteran status, and any other characteristic protected by applicable law. Infinitus Systems believes that diversity and inclusion among our teammates is critical to our success as a global company, and we seek to recruit, develop and retain the most talented people from a diverse candidate pool.

Please Note: Applicants must be authorized to work in the US without employer sponsorship.

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