A Content Filtering developer designs and implements software solutions that screen and block access to inappropriate or harmful online content. They work on algorithms that categorize and filter data based on specified rules, such as blocking explicit content or preventing access to certain websites. They also ensure the system's accuracy and efficiency, adapt to new types of content, and handle false positives or negatives. Additionally, they work on user interfaces for customizing filter settings, handle data privacy concerns, and maintain the system's robustness against evasion techniques. They also update the system to respond to evolving online threats.