Lead Backend Engineer

Job description

About Tonsser Tonsser is on a mission to redefine youth sports. Hundreds of thousands of young athletes across Europe already use Tonsser to track their performance, get discovered, and feel part of something bigger than the next match. We're now starting our most ambitious chapter yet, a new project that will reshape an entire category, and we're looking for a Lead Backend Engineer to help us build it. The Role: You'll own the architecture of the Tonsser platform as we move into this next phase. That means making the foundational technical decisions for a product used by a generation of athletes and setting the bar for how a small, ambitious team builds in 2026. This is a hands-on lead role. You'll write code, shape the system, and set the technical direction. You'll also help us level up as a team, particularly around how we adopt AI as a core part of how we build and what we ship. What you'll do: - Lead the architectural direction of our backend platform as we evolve from where we are today toward what's next - Drive the technical roadmap for our new flagship project - Set the standard for how the team works with AI, both in our development workflow and as a product capability -...