I reviewed a NestJS fintech backend where the numbers never quite matched, this

<p>Banking software cannot afford to be casual about anything. Every transaction needs to be verified, logged, protected from tampering, and traceable if something goes wrong.

<p>A finance officer at a mid sized bank was closing out the month when the numbers refused to line up. Customer accounts held a few cents more, in total, than the bank's own

<p>While building <strong>iTicket.AZ</strong> — a real-time event ticketing platform — I came across a job posting from a major bank that listed <em>"building scalable, resilient,

<p>Most backend tutorials stop at "hash the password, you're secure now." That's good advice for authentication. It's not much use for the rest of a payment system, where you're

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<p>Modern backend applications handle thousands or even millions of requests every second. Users perform actions simultaneously: buying products, transferring money, updating