Staff Full-Stack Engineer, Applied AI

Hims & Hers is the leading health and wellness platform dedicated to improving health outcomes through personalized care. They are seeking a Staff Full-Stack Engineer to drive the development of AI-powered healthcare experiences, leading architectural decisions and collaborating with product teams to deliver innovative features.

Responsibilities:

• Lead architecture and platform development
• Design and own core AI workflow platforms, orchestration systems, and shared SDKs that power intelligent healthcare experiences
• Build scalable, reliable systems for LLM orchestration, grounding, evaluation, and agent-like workflows
• Create reusable frameworks and patterns that other engineering teams can adopt across the company
• Drive multi-quarter technical initiatives and help bridge AI research prototypes with production-grade systems
• Partner closely with Product across multiple verticals
• Work with Pharmacy, E-commerce, Care, and Operations to bring AI-powered features to life, from patient-facing journeys to internal efficiency tools
• Collaborate on product strategy, helping translate ambiguous ideas into clear technical plans
• Support teams in releasing features quickly through incremental, high-velocity delivery cycles
• Ensure user-facing AI experiences meet expectations for performance, reliability and usability
• Champion safety, privacy, and clinical integrity
• Develop evaluation frameworks and observability systems that measure AI behavior, grounding, safety, and quality
• Establish guardrails and patterns that ensure all AI interactions comply with HIPAA, security-by-design, and privacy-first principles
• Work with clinical, legal, and AI safety partners to ensure our systems are trustworthy and appropriate for healthcare use
• Elevate engineering excellence
• Mentor engineers and help cultivate strong engineering practices across the Applied AI organization
• Lead design reviews and contribute to architectural governance across engineering teams
• Improve developer experience and remove platform bottlenecks that slow down product teams
• Raise the overall quality bar by championing clear standards for reliability, observability, testing, and iteration
• Build and ship across the full stack
• Develop features and infrastructure using TypeScript (AWS, Cloudflare Workers, React/Next.js) and Python (Databricks, orchestration, evaluation)
• Integrate and evaluate LLMs and ML systems through unified AI gateway
• Build secure APIs and connectors that link to domains like EHR, Pharmacy, Payments, Orders, and Care
• Contribute to shared libraries that standardize schemas, tool contracts, and developer experience

Requirements:

• 8+ years of professional experience across backend services, frontend applications, distributed systems, and data/ML tooling
• Strong proficiency in TypeScript and Python, with experience building production systems in both languages
• Deep familiarity with LLM- or ML-based systems and the architectural patterns needed to operate them safely at scale
• Experience leading major technical initiatives that span multiple teams or product areas
• A product-driven mindset with a bias toward fast, incremental delivery and continuous learning
• Strong communication and collaboration skills across engineering, product, design, operations, and clinical teams
• A deep appreciation for safety, privacy, and security — ideally with experience in a regulated domain such as healthcare, fintech, or life sciences
• Experience with Databricks, Cloudflare Durable Objects, vector databases, or edge-based AI orchestration
• Prior work on AI evaluation systems, LLM behavior monitoring, or safety frameworks
• Contributions to open-source SDKs or complex infrastructure projects
• Experience building tools that significantly increase developer velocity