Explore strategies for improving large-scale legacy C++ applications in this ACCU 2019 conference talk. Learn how to overcome the challenges of complex codebases, implement clean coding practices, and effectively refactor legacy systems. Discover key elements for regaining control over code quality, including team dedication and prioritized steps. Gain insights on when and where to refactor, which strategies to employ, and how to align your team. Address the challenges of working with older compilers and IDEs, and explore ways to leverage tools for code improvement. Benefit from Arne Mertz's decade of experience in modern and legacy C++ development as he shares valuable techniques for maintaining and enhancing large-scale C++ projects.