Principal E-Commerce Engineer

About Happy Health Happy Health is revolutionizing sleep medicine delivery through our comprehensive telehealth platform. We've eliminated the traditional barriers to sleep care – no more waiting months for appointments or spending uncomfortable nights in sleep labs. Our patients receive FDA-cleared home sleep testing via Happy Ring, connect with board-certified sleep specialists, and when required, begin evidence-based treatment within just 5 days. Ongoing physiological data monitoring with the Happy Ring enables real-time condition management, combination therapies, and drives measurable outcomes. Happy Ring represents the future of sleep diagnostics: an FDA-cleared medical device integrating advanced biometric sensors with AI-powered analysis to deliver highly accurate diagnostics and longitudinal management at home. For sleep medicine physicians, this means you'll have access to high-quality diagnostic data that empowers you to make confident clinical decisions for your patients, and integrate multimodal treatments that focus on root-cause solutions. Overview This is a hands-on principal-level role with direct ownership of the architecture, implementation, operation, scalability, reliability, security, and long-term evolution of our customer-facing eCommerce systems, storefront infrastructure, payment workflows, attribution and analytics instrumentation, and related integrations. As part of the software team behind the Happy Health product, you will collaborate with both technical and non-technical leaders across multiple disciplines to ensure that the purchasing, subscription, fulfillment, and post-purchase experiences around Happy Health are seamless, reliable, and built to scale. You will help ensure that the integrated systems underlying the end-to-end commerce experience (including Shopify, Stripe, CRM via Customer.io, 3PL, funnel analytics via Mixpanel, and marketing attribution) are not only well designed and implemented, but also operated reliably over t