About Welle Welle is a next-generation proactive health platform helping people live healthier, longer, and better. We combine advanced diagnostics, personalized therapeutics, and adaptive coaching to deliver whole-health programs for individuals and organizations. We're a funded, mission-driven team building real products for real users. This is an opportunity to work on meaningful healthcare technology with a team that values ownership, speed, and high standards. The Role We're hiring an experienced Sr. Full-Stack Developerwith strong production experience in Node.js/Nest JS, React/Next.js, and Java Script/Type Scriptto help accelerate product delivery and raise the quality bar across our platform. This is a high-ownership, hands-on engineering role for someone who has already built, shipped, and supported real systems in production. You'll own features end-to-end, contribute to technical decisions, and work closely with a distributed team to turn business needs into reliable, scalab...