A Firewall developer designs and builds firewall software to protect networks and systems from unauthorized access and potential threats. They analyze system specifications, develop appropriate firewall security measures, and integrate them into the network infrastructure. They also monitor, update, and troubleshoot firewalls to ensure optimal performance and security. Additionally, they may collaborate with other IT professionals to develop security policies and protocols. Their work is crucial in safeguarding sensitive data, preventing cyber-attacks, and ensuring the integrity and confidentiality of information. They must stay updated with the latest security trends and threat intelligence to continually enhance the effectiveness of the firewalls.