Money Is Not Just a Number
- Money
- Fintech
- Correctness
A practical look at designing money as a first-class value object, with exact minor units, currency-safe arithmetic, explicit rounding, lossless allocation and a boring wire format.
Read more →Writing
Idempotency Is Not Just a Header
- Idempotency
- Distributed Systems
How to make POST retries safe by treating idempotency as a scoped request contract
Read more →Tracking Mutable Data in Production
- SCD2
- Data Modeling
- Schema Design
A practical, production-minded look at implementing SCD2 for person data
Read more →An Opinionated Approach to API Keys
- api-keys
- security
A practical API key shape with public prefixes, hashed secrets, safer logs, and boring key management.
Read more →Secure APIs in Spring Boot with JWT
- JWT
- Spring Security
- Spring Boot
A field-tested perspective and insights gained from long-term deployments and experiments with JWT in Spring Boot APIs.
Read more →Double-Entry Bookkeeping from an Engineers Perspective
- Ledgers
- Double-entry bookkeeping
Building a simple, reliable double-entry bookkeeping system from the ground up with a practical database schema.
Read more →API Rate Limiting in Go with Redis
- Go
- Redis
- Rate Limit
Implementing a low-latency, highly scalable rate limiting mechanism with Redis and Go
Read more →