When most people think of security, they often envision hacking, firewalls, or complex tools. However, security begins much earlier, right from the moment we write our first lines of code.

From my experience testing real-world healthcare and fintech systems, I’ve seen how minor oversights, such as not validating inputs or storing data carelessly, can quickly escalate into serious security issues. The good news? Many of these mistakes can be avoided with simple habits.

In this talk, I’ll show how developers (even beginners) can prevent common security problems by checking inputs, handling passwords safely, and using automated checks in their workflow.