Hristian Ignev’s Post

Rebuilding old software has two traps. Copy the old system exactly and you pay a fortune to get the same problems on newer technology. Start over from scratch and you throw away the logic that quietly runs the business. The old system shows you what it does. It never tells you why, or which parts even still matter. It's rarely one clean rule. It's hundreds of them, wired together over years, where touching one thing quietly changes another three you didn't know were connected. And the code itself can mislead you: parts were shaped by old limits and quick fixes, so what looks deliberate was sometimes just a workaround nobody ever removed. So the real work isn't writing new code. It's untangling that. Mapping how the system actually behaves, separating the logic the business truly depends on from the scaffolding and dead ends no one needs anymore, and writing down the reasoning that until now lived only in old code and a few people's heads. Once that's clear, the rebuild gets safe. You move in small steps, and you prove each one: run the same real data through the old system and the new, and check the results match. Keep what the business depends on, drop the dead ends, improve the parts that were only ever limits of the old technology. Nothing changes by accident. You end up with modern software the business can trust, the reasoning finally written down, and the junk left behind instead of rebuilt. That’s the work we do at Camplight: www.camplight.net Have you rebuilt the system your business runs on, are you planning to, or not yet? Either way, how much of the why behind it is written down, versus living in people's heads?

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