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The State of Large-Scale Code Modernization

Jonathan Schneider's 2025 keynote on where large-scale modernization actually stands: AI, polyglot codebases, and never-ending CVEs. On-demand from Code Remix Summit 2025.

From end-of-life frameworks to sprawling polyglot stacks and never-ending CVEs, modernizing code at scale is one of the toughest and most necessary problems in engineering.

The keynote takes a clear-eyed look at where things stand and what moving forward actually takes — the rise of agentic AI, and why the future isn’t about bigger models so much as better data and tools. Generative AI writes new code well; modernizing existing code needs precision, and systems that know when not to guess.