Five Critical Checks Before Modifying Existing Application CodeFive Critical Checks Before Modifying Existing Application Code
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Before I touch anyone else’s code, I check these 5 things first 👇
Payments and webhooks. What happens when Stripe sends the same event twice?
Auth. Can a normal user open an admin page just by changing the URL?
Indexes. One missing index can turn a 4 ms query into a 3-second one.
Swallowed errors. An empty catch block hides bugs your users are already hitting.
Dependencies. Being 3 major versions behind means missing security fixes, and every upgrade gets harder.
Most apps don’t need a rewrite. They need the right things fixed, in the right order.
Which of these have you run into?
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