An Applicant Tracking System (ATS) developer designs, codes, and manages software applications used for tracking job applicants. They create system features for job posting, resume storage, candidate screening, and communication. They also incorporate functionality for data analysis to help HR teams assess recruitment strategies. Their role involves system testing, troubleshooting, and updates to ensure optimal performance. Additionally, they may integrate the ATS with other HR tools for seamless data transfer. They must follow data privacy regulations and often work closely with HR professionals to understand their needs and translate them into technical solutions.