Join Amazon's US Prime & Marketing Tech (UPMT) organization as a Senior Front End Engineer, where you'll help shape the future of personalized customer experiences across Amazon's retail ecosystem. This role offers an exciting opportunity to impact hundreds of millions of users worldwide by combining technology, science, and innovation. You'll be part of a team that believes in rapid development and frequent experimentation, working on new and existing services at an unprecedented scale. The position requires deep expertise in front-end design and computing fundamentals, with opportunities to mentor junior developers and collaborate with diverse stakeholders. You'll drive UI feature development, maintain technical excellence, and work closely with product owners and business partners. The role offers competitive compensation ($136,700-$261,500) based on location and experience, plus comprehensive benefits including equity. This is an excellent opportunity for experienced front-end engineers who want to make a significant impact while working with cutting-edge technologies in a fast-paced, innovative environment.