Sylwia Laskowska
JS Poland 2025 · Speaker

Sylwia Laskowska

Senior JavaScript Developer, Atos | Poland

Talk

Rewrite or refactor? How to safely move legacy apps to modern frameworks.

Sooner or later, every team faces the same question: how do we migrate from legacy code to a modern framework? Should we take the “big bang” approach and rewrite everything from scratch, or should we migrate progressively, piece by piece? In this talk, I’ll share real-world stories from large-scale frontend migrations and highlight the trade-offs of both strategies. We’ll explore the risks of freezing development for months, the complexity of running two worlds in parallel, and the decision-making criteria that help teams pick the right path.

About Sylwia Laskowska

Sylwia is a Senior JavaScript Developer with over a decade of experience. She has worked on a wide range of projects, from greenfield applications to complex migrations. As a Tech Lead, she focuses on helping teams modernize legacy codebases and build sustainable solutions.

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