Drupal is a backend framework written in PHP, and is used by an estimated 2.3% of all websites. There is a strong Drupal community of 1.3 million members who collectively produced more than 39,000 free modules. In the United States, Drupal developers earn an average of $93,346 per annum. Freelance Drupal developer rates worldwide vary from $61-80/hr, depending on experience and location.