Sentence examples for a hacker from inspiring English sources

The phrase "a hacker" is correct and usable in written English.
It can be used to refer to someone who engages in hacking, whether for ethical purposes, such as a security expert, or malicious intent.
Example: "The company hired a hacker to test their security systems and identify vulnerabilities."
Alternatives: "a computer intruder" or "a cybersecurity expert."