Your Checkout Design Fails the Moment the Payment Button Gets Clicked TwiceEvery frontend system design round has a moment where the candidate looks confident and the interviewer stops believing them. For a checkout, that moment is the second click. Not the first click. The 5d ago · 4 min readblognurrehmanai.hashnode.dev
Your User Paid. Your Screen Says Unpaid. That Is a Stale Data Bug, Not a GlitchYour user just paid. The screen still says unpaid. They pay again. Now support has two charges, one angry customer, and a bug report that says "payment broken" when the payment worked fine. That is stOct 21 · 3 min readblognurrehmanai.hashnode.dev
Your WebSocket Is Connected. That Is the Easy Part.Watch the 40-second version on YouTube: https://www.youtube.com/shorts/YYD2YfTcEK8 Watch the 40-second version on YouTube Every frontend system design interview has a moment where the candidate says "Oct 20 · 3 min readblognurrehmanai.hashnode.dev
Offset Pagination Silently Skips Rows. Your Demo Just Has Not Noticed Yet.https://www.youtube.com/shorts/czZkXS-1AQo Your pagination works in the demo. Then production arrives with a dataset that moves, and rows start vanishing. The bug with no stack trace Here is the failuOct 19 · 2 min readblognurrehmanai.hashnode.dev
Your Notification Feed Design Is a Happy Path FantasyYour Notification Feed Design Is a Happy Path Fantasy Every frontend system design interview has a moment where the interviewer leans back and says, "Let's design a notification feed." And every candiOct 18 · 4 min readblognurrehmanai.hashnode.dev
