We're quickly growing and super excited for you to join us! **About Topsort** Topsort is redefining Retail Media by democratizing ad monetization with privacy\-first, cookie\-free, AI\-powered technology. Our mission is to make advertising clean, intuitive, and genuinely effective, without creepy ads or outdated practices. Founded in 2021, Topsort has grown rapidly and now operates across 6 global hubs with team members in 13\+ countries. We work with retailers, marketplaces, and delivery apps in 40\+ countries and are quickly becoming a global leader in the space. **Why Topsort? Why now?** This is a unique opportunity to join a fast\-scaling, high\-impact company where your work matters from day one. You'll help shape the foundations of Retail Media 3\.0, working closely with founders and early team members in a highly collaborative, fast\-paced environment. **What it's like to work at Topsort** We move fast, communicate openly, and value direct feedback. We experiment, learn, and scale what works—without unnecessary bureaucracy. If you enjoy autonomy, ownership, and seeing real\-time impact, you'll feel right at home at Topsort. **What Is This Role Like?** As a Senior Engineer at Topsort you will build back\-end services, APIs, and front\-end experiences to support our mission: democratizing auction\-based infrastructure for all marketplaces. Our first product is sponsored listings as a service. We automate and simplify auctions so that any advertiser, especially small ones, can compete successfully. It's not easy. We use our game and auction theory expertise; implement real\-time, scalable, always\-available systems; and build an intuitive, easy\-to\-use UI for managing campaigns. **In this role, you will:** * Design, develop, and maintain scalable, high\-performance applications while ensuring code quality and best practices. * Provide mentorship, conduct code reviews, and drive best engineering practices to improve team efficiency. * Identify and resolve bottlenecks, optimize system performance, and ensure reliability in distributed architectures. * Work with cross\-functional teams, translate business needs into technical solutions, and drive innovation through new technologies and best practices. **What We Think You Need to Be Successful** \- we're open to candidates who don't check every box but show strong potential! **Core Requirements \& Experience:** * Bachelor's or Master's degree in Computer Science, Engineering, or a related field. * 5\+ years of experience in backend engineering, designing, developing, and maintaining scalable services. * Strong experience with microservices architecture and distributed systems, ensuring efficiency and reliability. * Proven track record of implementing engineering best practices, improving development efficiency and maintaining high code quality. * Proficiency in Python and TypeScript, with a solid understanding of best practices, patterns, and performance optimization. * Expertise in high\-performance, low\-latency systems, designing solutions that scale efficiently. * Deep knowledge of distributed systems, decoupling patterns, and modern software architecture to build robust and maintainable services. * Strong problem\-solving and collaboration skills, working closely with product and engineering teams to develop new features and optimize existing ones. **Bonus Points** * Experience in B2B SaaS, ad\-tech, martech, or data platforms. * Familiarity with retail, marketplaces, or media monetization. * Fluency in additional languages beyond English. **What We Value** \- at Topsort, we seek professionals who embody the following qualities to drive our mission forward: * Deep dive into details: Professionals who are not content with superficial answers and dive deeply into the details to uncover root causes and optimal solutions. * Team first: A low need for individual recognition, always prioritizing collective results over personal credit. * You thrive with ambiguity: Exceptional ability to tackle open\-ended problems in unstructured environments, turning chaos into structured innovation. * Adaptability: Willingness to learn, mentor, lead, and follow as the situation demands, fostering growth at all levels. * Urgency: A disproportionate sense of urgency in execution, while keeping scalability and the creation of replicable processes in mind to ensure long\-term success. * Curiosity: Genuinely curious individuals who can quickly learn difficult concepts and apply them effectively. Do you sound like the right fit? Let's dive right in!