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I write about what I ship in production: NestJS, AWS, and distributed systems.
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What happens when money stops being a number and becomes a responsibility? I asked myself that looking at amountCents in my POST /transfer draft. That day I wrote Money.
4 articles
Rebuilding a banking core phase by phase — accounts, transfers, ledger, and events with open source NestJS code and articles that explain why, not just how.
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4 articles
Production NestJS patterns — modular architecture, testing, observability, and AWS from real backends, one article at a time.
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Six boxes on the diagram. Six microservice temptations. I almost fell for it again — until I got that the full map doesn't mean shipping it all in week one, and splitting repos doesn't split the domain
Three seconds on the spinner. Timeout on screen. Did the money move? I reopened my Arkano challenge next to a fintech architecture map — and understood why POST /transfer was never just an endpoint.
A LinkedIn post on fintech architecture, a recent technical challenge, and a decision to rebuild a banking core from scratch — slower this time, to actually learn.
If onboarding a new customer requires deploying a new application or duplicating an entire database, your SaaS architecture probably isn't ready to scale. Learn how to implement multi-tenancy in NestJS in a clean and maintainable way.
If every new feature forces you to modify five different services, you probably have a coupling problem. Learn how Event-Driven Architecture helps decouple modules and scale NestJS applications.
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