Tag

#fintech

3 articles

Real Domains • April 22, 2026 • 11 min read

Real Cases — Microservices From the Field, with Code

A set of real-world microservices case studies from fintech, banking, and highload consumer products — what problem each team faced, which approach they picked, and the code that actually shipped.

microservices case studies

Real Domains • April 29, 2022 • 5 min read

Banking Ledger Design — Patterns That Actually Hold Up

The data models and constraints that make a banking ledger both performant and provably correct, learned the hard way over several years of building them.

banking ledger

Real Domains • December 3, 2021 • 5 min read

Building a Payment System on the JVM — Hard-Won Lessons

What matters when you're building the code that moves money. Idempotency, double-entry accounting, consistency, and the operational realities of payment rails.

payments fintech