Lead Backend Engineer - Kotlin & AI

Lead Backend Engineer – Kotlin & AI What do e-commerce, millions of daily users and pretty ambitious tech challenges have in common? Exactly where you come in. Our client is an established digital e-commerce company with around 350 employees and an international focus. The business model has long been more than a classic online shop: it’s about digital products, broad reach, complex platforms and the question of how a good idea becomes a product that really works in everyday life. Here, the security of a successful company meets the speed of a modern tech environment. New business models are being developed, start-ups are supported and technologies are being explored that will help shape the digital business of tomorrow. For you, that means: You won’t be handed a finished tech world that only needs to be managed. You can help shape the architecture, develop teams, use AI in meaningful ways and build things that make a visible difference. Benefits 30 days of vacation plus unlimited additional vacation daysHybrid working and workation opportunities - generally 3 days per quarter in the office, travel expenses are covered€1,500 annual training budget€30 monthly mobility allowance plus bike leasingCompany pension schemeEGYM WELLPASS for €25 personal contribution per monthA lot of trust, personal responsibility and freedom to make decisions Your responsibilities Lead and develop a product-oriented backend engineering teamTake responsibility for core B2B platform servicesMake and drive architectural decisions together with the teamStay hands-on, write code yourself and solve complex technical challengesTake responsibility for microservices based on the “You build it, you run it” principleDevelop secure, scalable and maintainable solutions with real business impactWork closely with Product Management and internal stakeholdersCoordinate APIs, interfaces and architecture across multiple teamsDrive AI-assisted development and new engineering approaches within the team Your profile Experience leading and developing engineering teamsEmpowering leadership style: trust instead of micromanagementVery good knowledge of Kotlin and Spring BootExperience with MongoDB and/or PostgreSQLConfident working with microservices, Kubernetes and production systemsExperience with REST APIs and event-driven architectures, ideally KafkaInterest in AI-assisted development; experience with agentic AI practices is a plus If you’re looking for a job where “Team Lead” doesn’t mean distributing tickets and moderating meetings, but rather truly bringing people, technology and product together, you should take a closer look at this role.