Staff Software Engineer (Frontend / UI)

Function Health is an AI-powered health technology company focused on helping people understand, measure, and improve their health. The Staff Software Engineer will lead development of member-facing web and mobile experiences, shape frontend architecture and performance, and contribute across the full stack. The role also provides technical leadership, mentorship, and collaboration with Product, Design, Clinical, and Data teams.

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
• AI-Powered Health Analysis Tools: Take the helm or contribute to the development of cutting-edge AI-powered tools designed to analyze health data. These projects aim to unlock new insights into health and wellness, offering personalized recommendations and predictions to our users. Your work will involve optimizing algorithms, refining data models, and ensuring these tools are both accurate and scalable
• Enhancing Data Integration: You will play a crucial role in enhancing the integration of diverse data sources with our platform. This initiative is critical to providing a holistic view of our users' health, incorporating data from wearable technologies, medical records, and other relevant sources. Your expertise will be essential in ensuring seamless, secure, and efficient data flow across systems, enriching our platform's capability to deliver comprehensive health insights

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
• Component libraries
• State management
• Accessibility (WCAG)
• Performance optimization
• Frontend testing frameworks
• 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
• Test-driven development
• Continuous integration and deployment
• Software architecture principles
• Scalable system design

• Commitment to writing maintainable, high-quality code
• 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