<p class="font-claude-response-body break-words whitespace-normal">At Similarweb, we are revolutionizing the way businesses interact with the digital world by revealing to them everything that happens online.</p> <p class="font-claude-response-body break-words whitespace-normal">Our unique data and solutions empower over 4,300 customers globally, including industry giants like Google, eBay, and Adidas, to make game-changing decisions that drive their digital strategies.</p> <p class="font-claude-response-body break-words whitespace-normal">In 2021, we went public on the New York Stock Exchange, and we continue to reach new heights! Come work alongside Similarwebbers across the globe who are bright, curious, practical and good people.</p> <p class="font-claude-response-body break-words whitespace-normal">We are looking for a <strong>Senior Fullstack Engineer with a strong backend orientation</strong> to join the development of our scalable, AI-powered product systems.</p> <p class="font-claude-response-body break-words whitespace-normal"><strong>What You'll Do:</strong></p> <p class="font-claude-response-body break-words whitespace-normal">Join a role that combines deep backend expertise with solid frontend fluency and product thinking, along with the ability to leverage AI tools effectively across the development lifecycle. You will work closely with product, design, frontend, and data/AI teams to build reliable, performant systems and intuitive user experiences, while driving engineering excellence and modern development practices. Your contributions will shape the technical foundation of an AI-first product and directly influence the experience of end users.</p> <p class="font-claude-response-body break-words whitespace-normal"><strong>What does the day to day of a Senior Fullstack Engineer at Similarweb look like:</strong></p> <p class="font-claude-response-body break-words whitespace-normal">Your daily work will span backend architecture, frontend collaboration, and AI-augmented development, engaging directly with the systems that power our product.</p> <p class="font-claude-response-body break-words whitespace-normal">Your role will include:</p> <ul class="[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1"> <li class="font-claude-response-body whitespace-normal break-words pl-2">Design and build scalable, maintainable backend services using NestJS (Node.js/TypeScript) and/or Python</li> <li class="font-claude-response-body whitespace-normal break-words pl-2">Own API design, contracts, and versioning acros