Back-End Developers concentrate on what goes on behind the scenes of a website. These are the people who build the databases that host the site’s content and implement the technologies that runs its search and e-commerce capabilities. Focused more on the website’s responsiveness and speed than what its pages look like, they’re skilled in languages such as Python and PHP, and frameworks like Django and Ruby on Rails. Their pay ranges from $43,000 to $116,000, PayScale says, with a median of $75,000.

Among the most common job titles you’ll see:

Web Developer: A person whose primary responsibilities include the programming and development work involved in creating a working website. Though this is largely a technical role, a certain amount of business knowledge and communications skill is important to doing the job successfully. the average Web developer’s salary ranges from $36,000 to $80,000, depending where they live and how much experience they have. The median is about $54,000, but recruiters say demand for job candidates is pushing pay higher. Senior Web developers’ pay ranges from $52,000 to $107,000, says PayScale, and experience with technologies like C# and Java can result in even more money.