Japanese Engineer Turns 11 Years of Legacy .NET Experience Into AI-Assisted Modernization Plan

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A Japan-based software engineer with over eleven years of C# and .NET experience set out to find an easy, AI-driven income stream after noticing viral overseas money-making schemes that were largely unavailable in Japan. After consulting both GPT and Claude, both AI tools independently suggested leveraging his existing engineering background rather than chasing passive-income shortcuts. The recommendation pointed toward legacy system modernization, a sector where Japan's Digital Agency reported in 2025 that 61% of companies — and 74% of large enterprises — still operate legacy systems. With .NET 8 reaching end-of-support in November 2026 and .NET 10 already released, demand for framework upgrade projects is actively rising. However, the engineer questions whether AI tools like GitHub Copilot can truly handle the messy, undocumented real-world legacy systems he has spent his career working on.

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