Concurrency questions trip up a lot of candidates because they don't know what to look for. In this video, I'll give you a framework that makes these problems predictable. We start with a real bug (the kind that shows up constantly in interviews), then break down the three types of concurrency problems you'll actually encounter: correctness, coordination, and scarcity. Once you know these patterns, you'll know exactly what primitives to reach for. Full written guide with code examples in Java, Python, Go, and more: Timestamps 0:00 - Intro 1:11 - Motivating Example 3:23 - Correctness: Check-Then-Act & Read-Modify-Write 9:52 - Coordination: Blocking Queues & Backpressure 15:59 - Scarcity: Semaphores & Connection Pools 20:54 - Putting It All Together About me: I'm Evan, former Meta Staff Engineer and co-founder of . Let's connect on linkedin!