[Senior Dev] REST API Interview: 40 Questions & Answers (Vol. 1)

Looking to land a Senior Developer role in 2026? 🚀 Mastering RESTful API design is no longer optional—it's the core of the technical interview. In Volume 1 of this series, we break down the first 40 REST API interview questions that high-paying companies (FAANG & Tier-1 Startups) actually ask. From Idempotency and Statelessness to HATEOAS and JWT Security, we cover the "Senior-level" reasoning you need to show you aren't just a junior coder. ✅ Subscribe for the Mock Interview Series: [YOUR_LINK_HERE] What we cover in Vol 1: The 6 Constraints of RESTful Architecture Idempotency: Why PUT vs POST matters for payments HTTP Status Codes (Beyond just 200 and 404) Versioning strategies: URI vs Header vs Query Param Security best practices for 2026