Application Security Engineer

Our Opportunity

The

Application Security Engineer will assess and strengthen the security of

applications developed and maintained by our team. The role will conduct

penetration tests and vulnerability assessments, provide practical remediation

guidance, and verify fixes in close collaboration with Development, QA, and

DevOps teams.

You Will

• Plan and

  conduct manual and automated penetration testing of web applications, APIs, and

  mobile applications where applicable.

• Evaluate

  authentication, authorization, session management, input validation, business

  logic, and sensitive data protection.

• Investigate

  vulnerability scanner results, eliminate false positives, and document clear,

  reproducible evidence.

• Prioritize

  findings based on severity, exploitability, and business impact, and promptly

  escalate critical vulnerabilities.

• Work

  with developers to address root causes, recommend practical fixes, and retest

  vulnerabilities before closure.

• Conduct

  targeted security code reviews, contribute to secure design reviews, and

  support security checks within development pipelines.

• Maintain

  a vulnerability register and prepare detailed technical reports and concise

  management updates.

• Guide

  developers on secure coding practices and help prevent recurring

  vulnerabilities.

Expected Deliverables

• Assessment plans outlining scope, approach, and schedule.
• Security reports with prioritized findings, evidence, reproduction steps, and remediation recommendations.
• Vulnerability register tracking ownership, deadlines, and resolution status.
• Retesting results confirming fixes and documenting outstanding risks.
• Periodic management summaries and practical secure coding guidance.

Requirements

To Be Successful You Need

• Bachelor’s degree in Cybersecurity, Computer Science, Information Technology, or a related field, or equivalent practical experience.
• 3+ years of hands-on experience in application security or penetration testing, including web applications and APIs.
• Strong understanding of common application vulnerabilities and OWASP testing practices.
• Demonstrated ability to perform manual security testing beyond automated vulnerability scanning.
• Practical experience with tools such as Burp Suite, OWASP ZAP, API testing tools, and vulnerability scanners.
• Good understanding of HTTP/HTTPS, REST APIs, authentication, access controls, SQL, and application configurations.
• Ability to review code in at least one relevant programming language and write basic testing or automation scripts.
• Experience guiding developers through remediation and verifying implemented fixes.
• Ability to manage assessments independently and communicate findings clearly to technical and nontechnical stakeholders.
• Relevant practical certifications, such as OSCP, OSWE, or equivalent.
• Experience with mobile security testing, threat modeling, and secure design reviews.
• Familiarity with CI/CD security tools, dependency scanning, and secret detection.
• Experience working in on-premises or restricted environments and handling sensitive information.
• Certifications are an advantage; demonstrated practical competence remains the primary selection criterion.

Siren is an equal opportunity employer. At Siren we value ethics, dedication, sustainability, safeguarding, respect, and inclusion.

Are you interested to work with our dedicated team on impactful projects? We welcome applications from all qualified candidates, regardless of background. Do apply!