First seen by Alion on Oct 15, 2026. Deloitte scores B on the Alion truth index.
We are looking for an experienced Application Security / Web Penetration Testing professional with strong hands-on expertise in manual and automated security testing of web applications. The ideal candidate should have a solid understanding of the OWASP Top 10, vulnerability assessment methodologies, risk prioritisation, and secure remediation practices. The candidate will be responsible for identifying and validating application security vulnerabilities, assessing their business impact, preparing detailed security reports, and working closely with development and business stakeholders throughout the vulnerability remediation lifecycle.
Responsibilities:
- Conduct manual and automated security testing of web applications to identify security vulnerabilities and weaknesses.
- Perform application security assessments covering authentication, authorisation, session management, input validation, business logic, API security, and other application components.
- Demonstrate strong knowledge and practical application of the OWASP Top 10 framework.
- Identify, validate, and exploit vulnerabilities using appropriate penetration testing methodologies and tools.
- Analyse vulnerabilities and prioritise findings based on: Severity, Exploitability, Business impact, Compliance implications, exposure, and attack likelihood
- Perform vulnerability validation and develop Proof of Concept (PoC) demonstrating the impact and exploitability of identified vulnerabilities.
- Prepare comprehensive security assessment and penetration testing reports containing: Vulnerability description, Affected application/component, Technical details, Evidence/screenshots, Proof of Concept, Risk rating/severity, Business impact, Remediation recommendations
- Collaborate with developers, application owners, architects, and other stakeholders to explain security findings.
- Provide practical security guidance and remediation recommendations throughout the vulnerability remediation lifecycle.
- Track identified vulnerabilities and support development teams in understanding and resolving security issues.
- Perform retesting/reassessment of remediated vulnerabilities to confirm that fixes are effective.
- Verify that remediation activities have not introduced new security vulnerabilities or regression issues.
- Present security findings, risk implications, and remediation priorities to technical teams and executive stakeholders.
- Stay current with emerging web application vulnerabilities, attack techniques, security standards, and application security best practices.
Requirements:
- Strong hands-on experience in Web Application Security Testing / Penetration Testing.
- Strong understanding of OWASP Top 10 and common web application vulnerabilities.
- Experience with vulnerabilities such as: SQL Injection, Cross-Site Scripting (XSS), CSRF, Broken Access Control, IDOR/BOLA, Authentication and Session Management issues, Security Misconfiguration, SSRF, File Upload vulnerabilities, Command Injection, XXE, Path Traversal, Business Logic vulnerabilities, API security vulnerabilities.
- Experience performing both manual and automated vulnerability assessments.
- Ability to understand application architecture, request/response flows, authentication mechanisms, and APIs.
- Strong ability to validate vulnerabilities and distinguish true positives from false positives.
- Experience creating detailed PoCs and technical security reports.
- Good understanding of vulnerability severity and risk-rating methodologies such as CVSS.
- Knowledge of secure coding and application security remediation practices.

