At WHOOP, we're on a mission to unlock human performance and healthspan. WHOOP empowers users to perform at a higher level through a deeper understanding of their bodies and daily lives. Our wearable device monitors key physiological metrics to provide personalized insights that improve fitness, health, and recovery. As a Software Engineer II (Backend) on Fitness, you will develop features that empower members to optimize performance and longevity. Fitness helps members understand key metrics such as strength and aerobic capacity, VO2 Max, Steps, and Heart Rate Zones - it is the bridge connecting members to our powerful data science algorithms through beautiful visualizations. You will collaborate with product management, design, data science, performance science, and your fellow engineers to shape and develop the technical direction of these impactful health and performance features.