A Firewall developer designs and builds firewall systems to protect networks and systems from unauthorized access and data breaches. They implement security strategies, write secure codes, and update firewall rules to ensure optimal performance. They analyze system vulnerabilities, conduct testing, and fix bugs to maintain high security standards. They also collaborate with network engineers and cybersecurity teams to understand security needs and develop solutions. They monitor firewall performance and conduct regular audits to ensure regulatory compliance. Furthermore, they create documentation and provide technical support for firewall systems, ensuring they meet the organization's security requirements.