Backend Interview: 10,000 users. Each email takes 100ms. Total time: 1000 seconds. 16 minutes to send all emails. One change makes it 10x faster. Same result. Same emails. What's the fix? 🤔

Your biggest security vulnerability in 2026 isn't a zero-day exploit. It's Ctrl+C. Every time a developer copies a credential: - It sits in their clipboard - It gets pasted into an AI tool - It travels to a server they don't control - It stays in chat history indefinitely

Index exists on date column. Query still scans 50 million rows. Dashboard takes 40 seconds to load. Index is there. Still slow. Why? 🤔

The AI era is creating a new type of developer. Not the one who memorizes every API. The one who can: - understand a problem - break it into systems - use AI effectively - verify the output - secure the implementation - ship The skill isn't "knowing AI." It's knowing how to work with it.

Agentic AI interview question: Your agent keeps calling the same tool repeatedly because it believes the task isn’t complete. How would you detect and stop the loop?

Agentic AI interview question: The agent claims it successfully updated a customer’s address, but the database was never changed. How would you design the system so the agent can’t declare success without evidence?

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Agentic AI interview question: An agent calls the same payment API three times because of retries. How would you design idempotency into the tool layer?

Works perfectly. You add this one line: const processData = useCallback(() => {}, []); App breaks. Data never processed. Same function name. Completely different behavior. Why? 🤔

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4 security bugs in this code. Most developers spot only 1. Can you find all 4? 🤔

A judge ruled in January that twenty million ChatGPT conversations had to be handed to the plaintiffs in a copyright case. Not because anyone was hacked. Because discovery works like that, and because the court found that what you type into a chat box you disclosed voluntarily. Enterprise and zero-retention plans were carved out. The twenty million are consumer chats, which is where most of us actually debug things. Deleting a chat clears your sidebar. It doesn’t clear a retention window, a legal hold or a discovery sample. And you can’t rotate a key you never noticed pasting. Be honest: if a key went into a chat box last month, would you know?

Tech Lead says:"Change the delete endpoint. Return 204 instead of 200." Junior dev: "What's the difference? Both mean success." Do you agree with the junior? Or do you agree with the Tech Lead? Which one is correct for a delete operation? And why? 🤔

You want all users. Even ones with zero orders. But users with no orders are missing from results. LEFT JOIN should include everyone. Why are they disappearing? 🤔