Glossary

Common engineering terms used across articles, discussions, and code reviews. Listed alphabetically.

Term	Definition
ADR	Architecture Decision Record — a short document capturing why a significant technical decision was made.
CAP Theorem	In a distributed system you can only guarantee two of three: Consistency, Availability, Partition tolerance.
CI/CD	Continuous Integration / Continuous Delivery — automating build, test, and deployment pipelines.
CQRS	Command Query Responsibility Segregation — separating read and write models in a system.
DRY	Don't Repeat Yourself — avoid duplication by abstracting shared logic.
Idempotent	An operation that produces the same result no matter how many times it's applied.
N+1 Problem	A database performance issue where fetching N records triggers N additional queries instead of one join.
OWASP	Open Web Application Security Project — publishes the Top 10 list of common web vulnerabilities.
SLO / SLA	Service Level Objective / Agreement — targets and commitments for system reliability (e.g. 99.9% uptime).
TIL	Today I Learned — a short write-up of a small discovery or insight.
YAGNI	You Aren't Gonna Need It — don't build for hypothetical future requirements.

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