Senior Search Backend Engineer

About commercetools Real innovation starts with a strong foundation, and at commercetools, that comes from the perfect balance of our product and our people. Behind every leap forward is a collective of builders, explorers, doers, makers, and problem-solvers.The kind of people who not only pioneered a more flexible approach to commerce architecture but also shaped the culture of experimentation that approach unlocked. Together, they are the engine of commerce innovation today. At commercetools, we power the next era of commerce for our customers. Whether it’s AI-driven solutions that help enterprises make smarter business decisions, bridging digital and physical shopping experiences, or enabling entirely new ways for industries to connect with their customers, we help the world’s most ambitious companies experiment, scale, and grow without limits. Here, the best idea wins, not the loudest voice. You will have the tools, trust, and space to not only build the future of commerce but to build your own. Your Impact As our Senior Search Engineer , you’ll support the Search Foundation Team by developing a modern, integrated search experience for our customers, providing them with a search API for product discovery and the foundations of search capabilities across domains. Your Impact As a Senior Search Engineer on our Discovery Team , you will build the retrieval layer behind product discovery for some of the world’s most demanding commerce brands. Search is changing shape. Shoppers type full sentences instead of keywords, and increasingly the client calling our API is an AI agent rather than a person. We are on the path to take our semantic and hybrid retrieval to general availability, and tackling the hard problems: making it fast, affordable, measurably better across enterprise catalogs, and working out what comes after it. You would join that work at every layer, from query understanding down to the vector index and the cost of a single query. You will: • Design and implement search functionalities in a PaaS ecommerce Scala backend • Develop search capabilities that combine lexical, semantic, and hybrid retrieval • Develop search-related libraries based on ElasticSearch and MongoDB • Contribute to search relevance and quality, and to how we measure it • Run and maintain a scalable search “infrastructure as code” on top of Kubernetes using terraform and multi-tenant architecture • Test software components regarding usability, functionality, and performance, and work closely with Product Management and DevOps • Learn Scala and functional programming as your new main development tools • Take part in on-call rotation with a worldwide distributed team for production systems This role is hybrid, with three days a week spent in our Munich, Berlin, London or Valencia office. What Sets You Apart You're a creative problem-solver who is wired to find solutions. You confidently dive into complex challenges and have a talent for making them simple for others. Your curiosity drives you to constantly grow and contribute to an environment of trust and teamwork. Great ideas come from many paths, and your unique perspective matters more than checking every box. What matters most is the mindset you bring to the work. You do not need to be an ML researcher for this role. You need to be a strong backend engineer who is genuinely interested in retrieval quality. You bring: • At least 5 years of experience as a Software Engineer, with production experience on the JVM • Solid understanding of parallel and asynchronous programming, as well as non-blocking I/O • Experience developing REST APIs and knowledge of scalable architectures, including sharding, replication, load balancing, and failover • Interest in working with Scala usin