Product exists -> 200 OK. Product doesn’t exist -> 200 OK, body: null. Frontend shows a blank page. Monitoring says everything is healthy. Nobody gets an alert. Same endpoint. Same code. Zero errors anywhere. What’s wrong? 🤔

Delete 1000 users. 1000 separate DELETE queries. Database sweating. Query 500 succeeds. Query 501 fails. 500 users deleted. 500 still exist. Partial deletion. No rollback. Data is now inconsistent. Two problems. Can you spot both? 🤔

User posts a comment. Waits 4 seconds. Notification takes 2 seconds. Count update takes 2 seconds. User doesn't care about any of this. They just want their comment posted. What's the fix? 🤔

Works perfectly in dev. Every file downloads correctly. Goes to production. Users start downloading unexpected files. Files they were never supposed to access. No bug in the logic. No error in the code. What's wrong? 🤔

3 critical security bugs. Code looks completely normal. Ships to production every day. Can you find all 3? 🤔

Post has 100 comments. API fires 201 queries. Post has 1000 comments. API fires 2001 queries. Works fine in dev. Kills production. What's wrong? 🤔

User adds items to cart. Prices are fetched from cart. Payment processed. Attacker modifies cart prices before checkout. ₹10,000 order. Pays ₹10. What's wrong? 🤔