An Applicant Tracking Systems (ATS) developer designs, creates, and maintains software systems that automate the recruitment process. They work on features like job posting, applicant data collection, resume parsing, candidate screening and ranking, interview scheduling, and reporting. They integrate the ATS with other HR systems, ensuring seamless data flow. They also troubleshoot issues, provide user support, and regularly update the system to improve functionality, user experience, and compliance with recruitment laws. They collaborate with HR professionals to understand their needs and translate them into technical solutions, thereby enhancing the efficiency and effectiveness of recruitment processes.