The job of a website programmer is to create the code that makes a website look and function as it should. You have a certain level of responsibility to ensure that when you program websites, you do it in the correct manner. This is not only from a functionality point of view but also from a security perspective as you need to ensure that the code and methods you are using are secure and have been created with security in mind. This is particularly important when it comes to ecommerce sites and on these sites you will be taking personal details such as address, phone numbers and even payment details from a card or Paypal account etc. This data must be handled in the correct way and each website that does this must be complaint with the latest standards.
If the security is breached on a website, personal data may be stolen, the website content may be changed or the website taken down entirely.
To ensure that you are up to date with all of the latest technological advances in programming it is advised that you either attend regular courses or ensure you do your own in depth research.