Senior Application Security Engineer

Job Title: Senior Application Security Engineer

Location: London, UK

Rate: £575 per day, Inside IR35 (dependent on experience)

Duration: 6 months

Tec Partners are working with a leading technology client, who are currently looking for an experienced Senior Application Security Engineer to work on a customer assignment, providing subject matter expertise across code review, penetration testing, and secure development lifecycle initiatives.

As a Senior Application Security Engineer, you will combine hands‑on technical delivery with cross‑team guidance, serving as the go‑to expert on application security for internal development teams.

Key Responsibilities:

• Be an application security subject matter expert, guiding internal development teams
• Perform code reviews, penetration tests, and architectural reviews on existing and new applications
• Develop, implement, and communicate vulnerability mitigation strategies
• Handle externally reported vulnerabilities
• Drive the static and dynamic application security testing (SAST/DAST) programme
• Advise development teams on secure SDLC best practices

What we are looking for:

• 5+ years' experience as an Information Security Researcher or Engineer
• 3+ years' experience manually auditing source code, or strong programming skills in Java, .NET, Python, or JavaScript frameworks
• Strong understanding of OWASP Top 10, API security risks, and cloud-native application architecture
• Proven experience in application penetration testing and security code review
• Experience with SAST, DAST, IAST, and SCA tools and processes
• Solid understanding of CI/CD pipelines and DevSecOps principles

This is an exciting opportunity for an experienced Senior Application Security Engineer to join a truly world‑class business, which will give you access to incredible learning and development opportunities, and work on assignment with an equally exciting customer.

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