Developer Builds Fake Legacy App From Scratch to Test AI Modernization Abilities

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A developer planning to test AI-driven legacy system modernization hit a roadblock: every real business app they had worked on was proprietary and could not be shared publicly. To work around this, they decided to build a synthetic legacy application from scratch, simulating the messy, incomplete conditions under which real legacy systems are created. The project, called AI Legacy Modernization Corpus (AI-LMC), aims to recreate not just old code but the full historical context — including ambiguous specs, unanswered questions, and solo developer decisions. The first application being constructed is set in 2008, with a fictional developer named Yamada-san building it under realistic constraints of that era. The corpus and pre-registration are publicly available on GitHub, with the actual modernization experiment set to begin in a subsequent phase.

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