Security Tester
GrowingIdentifying vulnerabilities in software and APIs before they reach production environments
Security Tester Salary
United Kingdom
£35,000 – £68,000
United States
$65,000 – $115,000
Varies by location, sector, and experience. Last updated: 2025.
What Is a Security Tester?
A Security Tester identifies security vulnerabilities, weaknesses, and misconfigurations in software applications, APIs, and infrastructure by simulating the techniques and approaches that malicious actors use to compromise systems. The role sits within quality assurance and testing functions — ensuring software is not only functionally correct but resistant to exploitation before it is released into production. Security Testers work alongside development, QA, and security engineering teams to identify and communicate security defects that standard functional testing does not reveal.
The discipline covers web application security testing, API security assessment, mobile application security, network penetration testing, and vulnerability assessment against recognised security standards. Security Testers work across financial services, healthcare, government, and enterprise software — any context where software security carries regulatory, commercial, or safety consequences. The role is distinct from Penetration Tester — which focuses on adversarial red team assessment of production environments — in that Security Testers are embedded within the software development lifecycle, testing systems before they reach production as part of a structured quality assurance process.
What Does a Security Tester Do?
- Design and execute security test plans, identifying attack surface, threat vectors, and appropriate testing approaches
- Conduct web application security testing against OWASP Top 10, identifying injection vulnerabilities, authentication weaknesses, and access control failures
- Perform API security testing, assessing authentication, authorisation, input validation, and data exposure across REST and SOAP interfaces
- Execute vulnerability assessments against application infrastructure, identifying misconfigurations, unnecessary exposure, and known vulnerability patterns
- Document and report security findings, communicating vulnerability severity, exploitation risk, and remediation guidance to development teams
- Integrate security testing into CI/CD pipelines by configuring SAST, DAST, and dependency scanning tools
Security Tester Skills
Hard Skills
- Penetration Testing
- Web Application Security
- Mobile Application Security
- API Design
- Vulnerability Management
- Secure Coding
- Exploit Development
- Network Security
- Test Planning
- Regulatory Compliance
Soft Skills
- Analytical ThinkingModelling attacker approaches systematically
- ScepticismAssuming surfaces are vulnerable until proven otherwise
- Methodical ApproachFollowing structured vulnerability assessment processes
- CommunicationReporting findings clearly to non-security stakeholders
- Ethics and IntegrityOperating within authorised testing boundaries
- RigourDocumenting evidence chains for each identified weakness
Security Tester Tools & Software
How to Become a Security Tester
Typical Route
Most entrants hold a bachelor's degree in Computer Science, Cybersecurity, or Software Engineering. Programs designated as National Centers of Academic Excellence in Cybersecurity by the NSA and DHS — including those at Purdue, the University of Maryland Global Campus, and Dakota State University — are well regarded by employers in financial services and government security testing. A master's degree in Cybersecurity or Information Assurance supports practitioners targeting senior penetration testing or security engineering roles in defense, healthcare, and financial services.
Alternative Route
OSCP from Offensive Security is the most respected hands-on credential in US security testing, demonstrating practical exploitation capability valued by employers across commercial and federal sectors. CompTIA PenTest+ provides a structured entry-level route and is recognized under the DoD 8570 framework. The eLearnSecurity Web Application Penetration Tester offers an accessible path for web-focused roles. TryHackMe and Hack The Box develop practical skills before professional entry. TCM Security and Cybrary offer structured training widely used by US practitioners.
A Day in the Life of a Security Tester
Morning
Afternoon
Security Tester Career Path
Junior Security Tester / QA Analyst
0–2 yrs
Security Tester
2–4 yrs
Senior Security Tester
4–7 yrs
Lead Security Tester / Application Security Engineer
7–10 yrs
Head of Application Security / Security Test Manager
10+ yrs
Security Tester Job Outlook
Application security testing demand is growing as organisations recognise that vulnerabilities introduced during development are significantly cheaper to remediate before release than after exploitation. DevSecOps practices — integrating security testing into CI/CD pipelines as a continuous quality gate — are creating demand for testers who can configure and interpret automated scanning alongside manual assessment. Regulatory pressure across financial services, healthcare, and retail is driving structured application security testing programmes across regulated industries.