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Skills that raise your pay
Test automation
Writing code that tests code. Doubles your value to an employer.
Performance testing
Finding out what breaks when 100,000 people log in at once. Banks and retailers pay well for it.
Security testing
The first step toward penetration testing, which pays far more.
ISTQB (International Software Testing Qualifications Board) advanced and agile certificates
Build on the Foundation Level and are common on senior job ads.