Senior Application Security Engineer

Fortinet, Inc.; United Kingdom; Hybrid; GBP 70,000 - 90,000; Full time

Job summary

A leading cybersecurity company is seeking a Senior Application Security Engineer to conduct in-depth security reviews of applications, collaborate closely with development teams, and drive initiatives for vulnerability mitigation. The ideal candidate has over 5 years of experience in information security with a strong grasp of OWASP vulnerabilities and is familiar with penetration testing and secure software development practices. This role encourages teamwork and proactive research to stay ahead of security threats.

Qualifications

• 5+ years of work experience as an Information Security Researcher or Engineer.
• Strong understanding of OWASP TOP 10 vulnerabilities.
• Strong understanding of common API security risks.
• Proven experience in application penetration testing.
• Experience in Mobile Application Penetration Testing is a plus.
• A BS degree in Computer Science, Cyber Security, or equivalent experience.

Responsibilities

• Conduct security reviews on various Fortinet applications.
• Provide security education to engineering teams.
• Handle externally reported vulnerabilities.
• Drive Fortinet's application security testing program.

Skills

Information Security Researcher or Engineer experience

OWASP TOP 10 vulnerabilities knowledge

API security risks understanding

Cloud-Native application architecture understanding

Application penetration testing experience

Security code review experience

Application security testing tools knowledge

Computer and network security foundation

Web security standards knowledge

CI/CD pipeline understanding

Security architecture design experience

Cloud security solutions familiarity

Threat modeling methodologies experience

Web proxies knowledge

OAuth and JWT understanding

Organizational and communication skills

Degree in Computer Science or Cyber Security

Education

BS degree in Computer Science, Cyber Security or related

Tools

Burp Suite

OWASP ZAP

Fiddler

Job description

• Job Category Product Security Engineering
• Posting Date 07/17/2025, 04:06 PM
• Job Schedule Full time

Job Description

Senior Application Security Engineer

Fortinet is looking for a Sr. Application Security Engineer to join the Corporate Information Security team. This is a highly technical role, with responsibilities conducting security reviews on various Fortinet applications, providing security education to our engineers and handling externally reported vulnerabilities.

Key Responsibilities:

• Serve as an application security subject matter expert who provides guidance to internal teams
• Work closely with development teams, perform code reviews, penetration tests, and architectural reviews on existing codes and new features.
• Develop, implement, and communicate vulnerability mitigation strategies to development teams
• Handle externally reported vulnerabilities as a member of Corporate Information Security Responsible Disclosure Program committee.
• Drive Fortinet static and dynamic application security testing program.
• Develop strategies, evaluate solutions, design and implement tools, processes and controls to ensure that security and privacy are designed in Fortinet applications
• Advise development teams on SDLC best practices.
• Proactively research new attack vectors on applications that may affect Fortinet applications and infrastructure.
• Be part of a global distributed team to share knowledge, workload and assignments. Strong sense of teamwork is required. Coach peers in application security concepts and best practices.

Required Skills/Experience:

• 5+ years of work experience as an Information Security Researcher or Engineer
• Strong understanding on OWASP TOP 10 vulnerabilities.
• Strong understanding of common API security risks
• Strong understanding on Cloud-Native application architecture, microservices, containerization technologies, secure deployment and implementation issues.
• Proven experience in application penetration testing
• Proven experience in security code review
• Proven experience in application security testing (DAST, SAST, IAST, SCA) tools and processes
• Strong foundation in computer and network security, authentication & authorization, security protocols and applied cryptography
• Solid understanding with web security standards such as CSP, SOP, CORS, and emerging web security technologies.
• Solid understanding on CI/CD pipelines, build systems and DevSecOps principles.
• Experience defining security architecture patterns and standards in a large enterprise organization.
• Experience with cloud-based security solutions and familiarity with cloud service providers, particularly in relation to application security
• Experience working with threat modeling methodologies such as MITRE ATT&CK, STRIDE, PASTA etc.
• Efficiency with web proxies such as Burp or OWASP ZAP or Fiddler
• Understanding of OAuth and JWT implementations.
• Ability to organize & communicate effectively, both written and verbal, with technical and non-technical people across functional teams
• A BS degree in Computer Science, Cyber Security, other tech-related degree, or equivalent experience.
• Experience in Cloud Security Posture Management (CSPM) and/or Application Security Posture Management (ASPM) tools is a plus.
• Having OSWE OSCP, GWEB, GPEN or similar certificate is a plus
• Experience in Mobile Application Penetration Testing is a plus
• Familiarity with AI&ML & LLM concepts, AI Red Teaming, AI Guardrails is a plus.

#LI-Hybrid

About Us

Fortinet makes possible a digital world that we can always trust through its mission to protect people, devices, and data everywhere. This is why the world’s largest enterprises, service providers, and government organizations choose Fortinet to securely accelerate their digital journey. The Fortinet Security Fabric platform delivers broad, integrated, and automated protections across the entire digital attack surface, securing critical devices, data, applications, and connections from the data center to the cloud to the home office. Ranking #1 in the most security appliances shipped worldwide, more than 615,000 customers trust Fortinet to protect their businesses. And the Fortinet NSE Training Institute, an initiative of Fortinet’s Training Advancement Agenda (TAA), provides one of the largest and broadest training programs in the industry to make cyber training and new career opportunities available to everyone.