Security Testing and Operations

Static code analysis inspects source for bugs and risky patterns. SAST is the security-focused version of it, tuned to find injection flaws, hardcoded secrets, and broken access control by tracing how untrusted data moves through the code. Because it never runs the program, it can examine every path, which is also why it raises false positives on paths that never execute in practice.

SCA solves a different problem. Most of the code in a modern application is not yours, it comes from open-source packages, and a library that was safe last month can have a published vulnerability today. SCA continuously matches your dependency list against known-vulnerability databases and tells you which packages to upgrade. This is the single most common source of large breaches, which is why SCA is non-negotiable.

Vulnerability scanning and DAST test the running system. A scanner checks hosts and services against a catalog of known issues like missing patches and weak configurations. DAST actively attacks the live application, sending malformed input the way an intruder would, so when it reports a flaw the attack genuinely worked. Penetration testing goes further by putting a skilled human in the attacker's seat to chain small weaknesses into a real breach, and bug bounty programs scale that idea by paying outside researchers for valid findings.

At a company like Google or Netflix none of this is a manual afterthought, it is wired into the pipeline. A commit triggers SAST and SCA before it can merge, and a flagged secret or vulnerable dependency fails the build the same way a broken test would. DAST runs against staging on a schedule, and a finding opens a ticket automatically. The goal is to push detection as early as possible, because a flaw caught in review costs minutes and the same flaw caught in production costs an incident.

For the operations side, large platforms feed logs from every service, host, and network device into a SIEM that correlates them. An IDS alert on its own is a single line, but the SIEM ties it to a failed-login spike and an unusual data transfer and turns three disconnected signals into one incident an analyst can act on. IPS sits at the network edge dropping known-bad traffic before it reaches the application.

The most security-mature organizations close the loop with red team and blue team exercises. The red team breaks in using real attacker techniques while the blue team tries to detect and contain them using the SIEM, IDS, and runbooks they built. Every gap the exercise exposes, like an attack the SIEM never flagged, becomes the next thing to fix. Microsoft, Google, and most major banks run these continuously, because the only way to know your detection works is to have someone genuinely try to beat it.