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Missing indexes are the most common cause of avoidable database performance problems in Rails applications. Here is the pre-deploy checklist I run and the index decisions that actually matter.
Read moreEvery production database needs a migration tool. Flyway and Liquibase both integrate with Spring Boot automatically. The choice between them is a tradeoff between simplicity and flexibility. Here is a complete setup for each and the criteria for choosing.
Read moreDeadlocks are deterministic — given the same lock acquisition order and timing, they reproduce reliably. Understanding the four conditions that create them makes both prevention and diagnosis systematic rather than guesswork.
Read moreAn API is a contract. Breaking it breaks your users. The design decisions that seem minor at launch — naming, error shapes, pagination, versioning — are the ones that cost the most to change later. Here is what holds up and what doesn't.
Read moreThread safety is not a property you add after the fact — it is a design decision made at the class level. Three strategies cover nearly every case: confinement, immutability, and synchronization. Here is how to reason about which applies and how to apply it correctly.
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