I just published one of the deepest articles I’ve written on JavaScript internals. Topic: “JavaScript Is Single-Threaded… So Why Do Race Conditions Exist?” Most developers hear: “JavaScript is single-threaded.” Then naturally assume: no concurrency no synchronization issues no race conditions But modern JavaScript systems constantly suffer from: stale React state async timing bugs API overwrites websocket ordering issues cache corruption inconsistent backend state Why? Because JavaScript concurrency is not really about threads. It’s about asynchronous operations overlapping across time. And once you begin understanding: Event Loop internals Promise scheduling Microtasks vs Macrotasks async/await execution flow Node.js Event Loop phases libuv architecture process.nextTick() Worker Threads JavaScript suddenly stops feeling “magical.” It starts feeling predictable. One realization changed how I think about engineering: Senior software engineering is mostly about execution order and coordination. Not syntax.…