Principal Design System Designer

Twin Health At Twin Health, we empower people to improve and prevent chronic metabolic diseases, like type 2 diabetes and obesity, with a new standard of care. Twin Health is the only company applying AI Digital Twin technology exclusively toward metabolic health. We start by building a dynamic model of each person’s metabolism — drawing on thousands of data points from CGMs, smartwatches, and meal logs — that maps their personal path to better health. Guided by a dedicated clinical care team, our members have lowered their A1C below the diabetes range, achieved lasting weight loss, and reduced or even eliminated medications, all while living healthier, happier lives. Working here Our team at Twin Health is passionate, talented, and united by a shared purpose: to improve the metabolic health and happiness of our members. We believe in empowering every Twin to make a meaningful impact for our members, our clients, and each other, while enjoying a supportive, collaborative work environment. Twin has been recognized not only for our innovation but also for our culture, including: Innovator of the Year by the Employer Health Innovation Roundtable (EHIR), selected to CB Insights’ Digital Health 150, and named one of Newsweek’s Top Most Loved Workplace® . With more than $100 million raised in recent funding, including a $53 million Series E round in 2025 led by Maj Invest, and a $50 million investment in 2023 led by Temasek, Twin is scaling rapidly across the U.S. and globally. Backed by leading venture firms like ICONIQ Growth, Sequoia, Sofina, Temasek, and Peak XV, we are building the most impactful digital health company in the world. Join us as we reinvent the standard of care in metabolic health. Opportunity At Twin Health, we are on a mission to leverage the power of AI and advanced technology for the ultimate good: fundamentally transforming human health and well-being. To scale this monumental impact, we need a visionary Principal Design System Designer to write the visual and interactive DNA of our future. This is not a maintenance role—this is a defining new era for our company, and you are arriving at the inflection point. Reporting directly to the Head of Design, you will lay the architectural bedrock that dictates how fast we move, how beautifully we build, and how deeply we impact lives for years to come. We operate in a fast-paced, high-stakes environment where speed, execution, and responsible innovation are paramount. You won't just be managing a library; you will be making rapid decisions and putting them to work immediately. By building a world-class, future-proof design system, you will empower our entire product and engineering organization to deliver life-changing experiences to the people who need them most. Whether you are building from 0 to 1 or architecting a massive 1 to 10 revamp, you will take the lead in driving the strategy that powers our mission. Responsibilities Architect the Company's Future: Play a critical role in defining the long-term trajectory of Twin Health's product design system. You aren't just building a system for today; you are creating the strategic blueprint that will support our next decade of growth. Speed & Bias for Action: In our fast-paced environment, you will drive rapid iteration and deployment, expertly balancing high-velocity execution with long-term architectural integrity. Establish System Governance: Define and maintain clear contribution models, documentation standards, and version control processes so the broader design team can easily adopt, contribute to, and scale the system at a rapid pace without creating fragmentation. Exceptional Execution & Craft: Uphold an uncompromisingly high bar for visual design. You know exactly how design patterns impact the broader UX, ensuring that our system is as beautiful, accessible, and inclusive as it is functional. You can independently generate and land on a compelling visual direction from scratch. Drive & Measure Adoption: Pa