Meaning
Asynchronous evaluation of software changes by a peer ensures that new logic meets established standards before it enters the shared environment. The practice of code review involves a developer submitting their work to another person for critique and validation. This step identifies errors, security flaws and architectural inconsistencies early in the process.
It serves as a pedagogical tool where the team shares knowledge and maintains a common understanding of the system.
Standard Enforcement
Consistency across a large project is only possible when every change is checked against a set of rules. During a code review, the reviewer looks for adherence to style guides and the use of approved libraries. This prevents the system from becoming a collection of disparate coding styles.
Risk Mitigation
Catching a bug before it reaches the live environment saves a measurable amount of money and capacity. A founder who no longer writes code uses the review process as a window into the technical health of the company. It provides a way to monitor the performance of the engineering team without needing to oversee their daily activity.
By requiring two sets of eyes on every change, the company reduces the chance of a single person making a mistake that causes a system wide outage. This layer of protection is the primary defence against the high cost of emergency repairs and the loss of customer trust.
Team Education
Knowledge of the system spreads through the company as developers read the work of their peers. This reduces the risk associated with a single person leaving the organization, as others have already seen and critiqued the code. It builds a shared sense of ownership over the quality of the final product.