Cloudflare · Software Engineer (New Grad)
Cloudflare's new-grad SWE loop leans practical and systems-flavored, fitting a company that runs a massive global network. Alongside solid data-structure coding, expect questions that touch networking, HTTP, concurrency, and how services behave under real traffic, plus a behavioral round on ownership and curiosity. Interviewers value engineers who understand what happens beneath an abstraction — how a request actually travels, where latency and failure come from — not just who can grind algorithms.
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What this interview tests
- Core data-structure coding (hash maps, trees, graphs, queues)
- Networking fundamentals (HTTP, DNS, TCP/UDP, caching)
- Tracing a request end to end and reasoning about latency
- Concurrency and how services degrade under high traffic
- Load balancing, retries, and cache invalidation trade-offs
- Curiosity about infrastructure and ownership of real work
Common question themes
Hash-map, tree, and graph data-structure problems
"Walk me through what happens when you load a URL"
TCP vs UDP, caching, and load-balancing trade-offs
Concurrency / rate-limiting design or debugging
"Tell me about a systems project you owned end to end"
Reason about latency and failure under high traffic
Modeled on a public Cloudflare new-grad SWE posting