Pair programming is a development practice where two people work on the same code at the same time. One person writes or drives the code, while the other reviews each step, asks questions, and looks for mistakes. The partners switch roles regularly so both stay engaged and understand the system.
In cyber security, pair programming matters because it reduces blind spots. A second set of eyes can catch insecure defaults, dangerous assumptions, weak error handling, or missed input validation before code is merged. It also preserves shared understanding, which is valuable when teams use AI coding tools or move quickly under pressure. In those environments, pair programming acts as a defense against overreliance on automated output: one person can challenge suspicious logic, verify that changes match the intended design, and slow down unsafe shortcuts. Attackers do not use pair programming directly, but defenders use it to make code review more reliable and to keep critical knowledge from living in only one person’s head.