Japan Missed Its Own 2025 Deadline to Modernise Decades-Old Legacy Systems
Japan's Ministry of Economy, Trade and Industry formally identified the country's ageing enterprise software as a national risk, setting a modernisation deadline that has now passed. Many critical systems — spanning banking, insurance, government, and manufacturing — were built generations ago by external systems integrators through multiple layers of subcontracting, leaving no single party with full knowledge of how they work. The original developers have largely retired, taking institutional knowledge with them, while the code continues to run largely untouched. Structural factors unique to Japan, including deep subcontracting chains and industries where long-term stability was always prioritised over renewal, have made the problem especially entrenched. Engineers working inside these systems describe the experience less as software development and more as archaeology, carefully excavating logic that no living person fully understands.
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