Just published a deep dive on one of the most misunderstood topics in JavaScript:

“JavaScript Is Single-Threaded… So Why Do Race Conditions Exist?”

Most developers assume:

single-threaded = no concurrency problems.

But modern JavaScript systems constantly deal with:

race conditions

stale state

async timing bugs

API overwrites

websocket ordering issues

synchronization failures

Because JavaScript concurrency is really about:

⚡ execution order

⚡ async scheduling

⚡ overlapping operations

—not multiple JavaScript threads.

The article explores:

Event Loop internals

Microtasks vs Macrotasks

Promise scheduling

async/await execution flow

Node.js Event Loop phases

libuv & thread pools

process.nextTick()

Worker Threads

real production synchronization bugs

One realization changed how I think about software engineering:

Large-scale systems fail more from coordination problems than syntax problems.

The deeper I study JavaScript internals,

the more I realize senior engineering is mostly…