Application security engineer

An application security engineer finds and fixes security weaknesses in software code and development practices. They review code and architecture for vulnerabilities, run security testing, build secure-coding standards and tooling, advise developers on safe practices, and integrate security throughout the development lifecycle so flaws are caught before release.

The role blends software engineering with security expertise, focused specifically on the application layer where much of modern risk lives. AppSec engineers work across software companies, especially those handling sensitive data.

The job suits people who think like attackers but build like engineers, enjoy the depth of code-level security, and want to make secure software the default rather than a scramble after a breach.