A database query takes 50 milliseconds with 1,000 records and 8 seconds with 10 million. What would you investigate first, and how would you prove the cause?
A customer clicks “Pay” once, but the server receives the request twice. Should your system prevent duplicate clicks, duplicate requests, duplicate charges, or all three?
Why are Java and C# so common in banking and enterprise software? Is it performance, mature tooling, long-term support, hiring availability, or the cost of replacing systems that already work?
Flutter has improved a lot, but I'd still question whether it's the right choice for every production website. How much should you care about SEO, accessibility, initial load time, and the web's native strengths before choosing it?
Every legacy system seems one rewrite away from becoming “safe, fast, and modern.” But if the real problems are unclear requirements and missing tests, what exactly will Rust fix?
System design interview:
Your application depends on five external services, each with 99.9% availability.
What availability can your application realistically achieve?
Would your answer change if:
All five services must be available for every request?
Some dependencies are optional?
You have caching, retries, fallbacks, or graceful degradation?
Walk me through your reasoning.
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Every old codebase suddenly needs Rust, a new framework, and a complete rewrite.
Has anyone calculated how much of the problem is actually the programming language?
A monolith is one building with rooms inside; microservices are separate buildings that must communicate.
Why do we keep treating separate buildings as the automatic sign of better architecture?