An antivirus developer designs and creates software to protect computer systems and networks from potential threats. Their tasks include researching and analyzing existing and emerging malware to develop effective countermeasures, updating antivirus software for enhanced protection, and troubleshooting any issues. They also conduct regular tests to verify the software's efficiency and reliability. They work closely with cybersecurity teams to ensure the software can effectively detect, quarantine, and remove viruses, spyware, and other malicious programs. Their role is crucial in safeguarding data privacy, system integrity, and preventing unauthorized access to computer systems.