When 50+ Android engineers contribute to a rapidly growing codebase, technical debt and executing migrations becomes an organizational challenge. At Qonto, we transformed our tech debt management by moving from vague group responsibility to empowering teams with a way to visualize and prioritize their debt, turning ‘someone should fix this’ into ‘we’re on it.’ In this talk, you'll learn how we: - Built a first prototype in just one month with a single engineer—no new tools, just clever use of existing APIs - Integrated it into our day-to-day processes, making tech health a routine - Designed a Health Score that teams actually want to improve - Orchestrated large-scale migrations with real-time tracking—no more guessing “are we there yet?” - Made debt reduction engaging with intuitive tooling and team-specific dashboards - Expanded the playbook to tackle dependency updates, flaky tests, and beyond We’ll also share hard-earned lessons and take a sneak peek at what's next. Join us to see how teams like yours can cut tech debt while boosting ownership, starting with what’s already in your toolkit.