It is one of the basic software engineer coding interview questions. Software re-engineering is the process of updating a piece of software into a more functional or user-friendly version by adding new features, optimizing old features, or amending and altering it to achieve the desired result. Re-engineering your software with the goal of fixing bugs can help you avoid having to make major changes down the road. You might also be able to add features to your product more quickly and easily than if you had to rewrite it from scratch. The benefits of software re-engineering are: Easier to maintain: Re-engineered code is more consistent and easier to understand than legacy code, which means that it is easier to maintain over time. Improved performance: Re-engineered code is more efficient than legacy code due to the fact that it has been optimized for performance. Faster development time: Since re-engineered code is more consistent, there are fewer bugs and errors in it that need to be fixed before development can begin. Less expensive: Re-engineering can reduce costs by improving efficiency, reducing maintenance costs, and removing unnecessary features from systems. Better security: Re-engineered code is more secure than legacy code because it has been designed with security in mind. Better user experience: Since re-engineered code is more consistent, there are fewer bugs and errors in it that need to be fixed before development can begin.