Engineers create scalable businesses by focusing on three key growth curves: exponential, linear, and logarithmic. Exponential growth refers to users and revenue increasing as people engage with the service and refer others. Retention plays a vital role here; the more satisfied users are, the more likely they are to bring in new users. Working in a team that prioritizes retention can lead to sustained growth. On the linear side, as user numbers rise, bugs and edge cases multiply. What may have been rare issues can become daily challenges. This shift makes code quality essential. Engineers need to navigate this complexity and address edge cases effectively to maintain a stable product. Finally, the logarithmic curve illustrates how support needs scale with the number of bugs. As issues grow, the demand for support increases, but ideally, the number of support staff should not grow at the same rate. To achieve this, engineers should automate processes, implement testing tools, and streamline documentation. These measures can help manage the support burden without overwhelming the team. The article emphasizes that while creating features may seem straightforward, maintaining and scaling them is a far more challenging task.