New Grad SWE Guide Part 2: Caching, CDNs, and Storage Fundamentals Explained

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A software engineer has published the second installment of a system design interview guide aimed at new graduate job seekers, resuming the series after a gap of over a year. The article covers core backend concepts including caching, Content Delivery Networks, and various storage strategies. It explains caching mechanisms such as write-through, write-back, and write-around strategies, along with eviction policies like LRU and LFU. The guide also introduces storage topics including SQL vs. NoSQL, object storage, replication, the CAP theorem, and sharding. The series is intended to help new graduates prepare for technical interviews before the author transitions to writing more intermediate-level content in 2026.

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