A Computer Forensic Timelines developer creates tools and systems that help in the investigation of digital crimes. They analyze data from computer systems to identify when and how a security breach occurred. They extract, process, and interpret the chronological data from the systems, often working with complex software to create a timeline of events. This timeline can provide crucial evidence in legal proceedings. Their work also involves validating the integrity of the data collected, ensuring it hasn't been tampered with. They often liaise with law enforcement and legal professionals, providing expert advice and testimony on their findings.