Code Review
Code review means having one or more other developers review every change before it's merged, typically through a pull request. It catches bugs and security issues before they reach production.
On a team of several developers, code review stops a security bug from slipping through unnoticed, keeps coding style consistent, and prevents one person from becoming the sole holder of knowledge about a critical part of the system. It's also a learning tool: a junior developer picks up a lot from regular, well-argued feedback on their code, and the whole team converges on the same standards together.
A superficial review (a quick "LGTM" with no real reading) creates a false sense of security: bugs keep slipping through, just unnoticed until production. On the other end, being overly picky about style details slows the team down for little real gain. The right balance is to focus review on logic, security, and maintainability, and automate the rest (formatting, linting) outside of human review.
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