Technical Question Bank · Peer-Reviewed
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (2,728 available).
A metric tree decomposes a top-level business goal into the drivers that influence it. For example, revenue equals active customers times purchase frequency times average...
Simpson's paradox is when a trend appears in several groups but reverses or disappears when the groups are combined. It happens because a confounding variable is unevenly...
MLOps applies DevOps practices to machine learning: versioning data, code and models; automating training and deployment; and monitoring models in production. Key compone...
CDC captures row-level changes from a source database and streams them downstream with low latency. A typical design: - Capture: read the database transaction log with a ...
Layer caches by distance from the caller and accept that each layer adds staleness and invalidation complexity. Typical design: - Edge/CDN: cache public and static respon...
For service-to-service calls, avoid shared static credentials and long-lived secrets. - OAuth 2.0 client credentials: each service is a registered client with a client id...
A service often must both change its database and publish an event. Writing to the database and then to the broker is a dual write: a crash between the two loses the even...
Two-phase commit is rarely used in microservices because it needs a coordinating transaction manager, holds locks across services, blocks on coordinator failure and hurts...
Do not hold the connection open. Instead accept the work and return 202 Accepted with a pointer to a status resource. ```http POST /reports Location: /reports/jobs/789 Re...
The officially supported and recommended way to scaffold a new Next.js application is using **`create-next-app`**: ```bash npx create-next-app@latest ``` ### Interactive ...
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