Staff Software Engineer (Frontend / UI)

Function Health is the AI operating system for health, designed to empower people to live 100 healthy years. They are seeking a highly skilled Staff Software Engineer to lead the development of member-facing experiences that help individuals understand and act on their health data, focusing on architecture, performance, and usability of web and mobile applications.

Responsibilities:

• Lead the architecture, design, and development of modern web and mobile applications
• Build intuitive, performant, and highly polished user experiences using React and React Native
• Establish frontend best practices around component architecture, state management, testing, accessibility, and performance
• Drive the evolution of our design system and shared UI component libraries
• Maintain a high bar for product quality, usability, and engineering excellence
• Own complex features end-to-end, from user interface development through backend services and APIs
• Collaborate closely with product, design, and data teams to transform ideas into exceptional customer experiences
• Design and implement scalable APIs and services that power our member-facing applications
• Contribute to technical decisions across frontend, backend, infrastructure, and data systems
• Champion frontend performance, responsiveness, accessibility, and reliability
• Optimize application performance across web and mobile platforms
• Leverage analytics and user feedback to continuously improve product experiences
• Ensure members can easily understand and interact with complex health information
• Provide architectural guidance and technical mentorship across the engineering organization
• Lead high-impact initiatives from concept through launch
• Drive engineering standards, code quality, and best practices
• Help scale engineering processes and systems to support rapid company growth
• Partner with Product, Design, Clinical, and Data teams to deliver impactful features
• Evaluate emerging technologies and development approaches to improve product quality and team velocity
• Foster a culture of continuous improvement, experimentation, and learning

Requirements:

• 10+ years of software engineering experience, including significant experience building customer-facing products
• Proven success leading complex technical initiatives in high-growth or startup environments
• Experience balancing hands-on development with technical leadership and mentorship
• Deep expertise in JavaScript/TypeScript and modern frontend development
• Extensive experience with React and modern frontend architectures
• Strong understanding of design systems
• Strong understanding of component libraries
• Strong understanding of state management
• Strong understanding of accessibility (WCAG)
• Strong understanding of performance optimization
• Strong understanding of frontend testing frameworks
• Strong understanding of modern build and deployment tooling
• Experience building highly interactive, data-rich user interfaces
• Understanding of mobile architecture, performance optimization, and platform-specific considerations
• Experience designing and building APIs and backend services
• Strong proficiency with Python or similar backend technologies
• Ability to comfortably work across the entire application stack
• Experience integrating third-party services and external data platforms
• Strong product instincts and a passion for creating exceptional user experiences
• Ability to balance technical excellence with business impact
• Experience collaborating closely with Product and Design teams
• Strong understanding of Agile development methodologies
• Strong understanding of test-driven development
• Strong understanding of continuous integration and deployment
• Strong understanding of software architecture principles
• Strong understanding of scalable system design
• Commitment to writing maintainable, high-quality code
• Ability to make progress in ambiguous environments
• Strong ownership mentality and willingness to tackle difficult problems
• Comfortable making decisions with incomplete information
• Adaptable and resourceful in fast-moving environments
• Excited to build processes, systems, and products from the ground up
• Thrives in rapidly evolving business and technical landscapes
• Exceptional communication skills
• Ability to explain complex technical concepts to non-technical stakeholders
• Strong collaborator across Engineering, Product, Design, and Operations teams
• Passion for learning new technologies and approaches
• Willingness to challenge assumptions and improve existing systems
• Growth mindset focused on continuous improvement
• Advanced expertise with React, React Native, and TypeScript
• Experience building large-scale consumer applications
• Experience developing data visualization and analytics experiences
• Familiarity with GCP, Postgres, and modern web architecture patterns
• Experience integrating AI or machine learning capabilities into user-facing products
• Startup experience as an early engineering hire, founder, or technical leader