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.

• 30 days of vacation plus unlimited additional vacation days
• Hybrid 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 leasing
• Company pension scheme
• EGYM WELLPASS for €25 personal contribution per month
• A lot of trust, personal responsibility and freedom to make decisions

Your responsibilities

• Lead and develop a product-oriented backend engineering team
• Take responsibility for core B2B platform services
• Make and drive architectural decisions together with the team
• Stay hands-on, write code yourself and solve complex technical challenges
• Take responsibility for microservices based on the \"You build it, you run it\" principle
• Develop secure, scalable and maintainable solutions with real business impact
• Work closely with Product Management and internal stakeholders
• Coordinate APIs, interfaces and architecture across multiple teams
• Drive AI-assisted development and new engineering approaches within the team

Your profile

• Experience leading and developing engineering teams
• Empowering leadership style: trust instead of micromanagement
• Very good knowledge of Kotlin and Spring Boot
• Experience with MongoDB and/or PostgreSQL
• Confident working with microservices, Kubernetes and production systems
• Experience with REST APIs and event-driven architectures, ideally Kafka
• Interest 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.