55 Senior Full-Stack Interview Questions for 2026 Cover Frontend, Backend, APIs and Databases

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A DEV Community guide outlines how senior full-stack interviews differ from junior ones, focusing on how a request moves from browser to CDN, API, cache, and database and back. It stresses understanding the seams between client and server, including trust boundaries, latency, and failure points. The article presents 55 questions spanning client-side, server-side, data and persistence, authentication and security, and delivery and architecture. Each question includes a short answer, a deeper explanation, and the signal interviewers look for. The examples draw on Mattrx, a multi-tenant platform built with React, .NET 9, Azure SQL, Redis, Kafka, and SignalR.

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ProgrammingDEV Community ·

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