Senior Full Stack Engineer - Checkout & Payments

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Full Stack Engineer - Checkout & Payments based in the United States. This is a senior full stack engineering role focused on building a world-class consumer checkout and payments experience. You’ll own substantial, user-facing initiatives from concept through launch, working in a small team of highly experienced engineers with significant autonomy. The role combines modern frontend engineering with backend APIs, data models, and payment infrastructure. You’ll partner closely with Product, Marketing, and Design to shape experiences that improve conversion and make complex healthcare spending simple for consumers. Performance, experimentation, and data-driven decision-making will be central to your work. You’ll also help establish frontend standards and technical practices as the platform scales.