Financial technology demands architectural precision. When an end-of-day (EOD) clearing cycle requires processing millions of ledger transactions within a tight batch window, traditional single-threaded runtime assumptions fall apart. In traditional enterprise environments, scaling compute-heavy tasks is typically solved by spawning native operating system threads guarded by expensive mutexes. Node.js approaches concurrency differently through the V8 engine and the asynchronous Event Loop. While the Event Loop excels at input/output-bound operations—such as database sockets, API payloads, or audit trails—it buckles under CPU-bound computational loads. When an application is forced to crunch millions of floating-point arithmetic transformations, decimal precision scaling operations, and double-entry validation rules sequentially on the main thread, the Event Loop freezes.…