The challenging task of security engineering is to protect a company’s computer sys-tems and networks from all security threats. Security engineers develop and imple-ment security solutions. This can be done in many ways: They establish security standards and best practices that a company should follow. Through a security assessment, they evaluate a compa-ny’s systems, networks, and data to determine what security requirements are neces-sary. Based on this, they develop a Security by Design and security measures suitable for individual needs, which are then implemented to protect the infrastructure. This upgrade is closely monitored and finally also checked for security vulnerabilities using scans and stress tests. The result is that all points of attack are reliably protected, and any consequential costs of a security leak can be avoided.