Florian Mierzejewski

Staff Engineer

Software engineer with 10+ YoE and a strong mobile background. I’ve worked in agencies and startups for widely different clients from various countries, on an even wider range of projects. From greenfield to enormous untested legacy codebases, I’ve seen horror and glory while repeatedly managing to have a positive impact. Eternal learner, you’ll always find me with a book, listening to a podcast or at a local meetup to improve what I know or discover something I don’t. I aim to always write simple and readable code, apply best practices, share knowledge, pair program, and mentor with a good dose of empathy and compromises.

No More ‘Someone Else’s Problem’: Tackling Tech Debt at Scale

When 50+ 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 without any new 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.