Web application security testing jobs

Lead and deliver complex penetration testing, red team, adversary simulation and security assessment engagements.
Define scope, testing approaches and methodologies for offensive security engagements.
Perform hands‑on security testing across web applications, APIs, infrastructure and cloud environments.
Conduct vulnerability assessments, exploitation and security validation activities.
Develop and execute adversary emulation and red team scenarios based on real‑world attack techniques.

Requirements

Nice to have: purple team exercises
Nice to have: cloud offensive security
Nice to have: mobile security
Nice to have: OT/ICS
Nice to have: IoT

Skills

penetration testing red teaming security assessments web application security testing

SECURITY ENGINEER

Atos SE · Posted Nov 6, 2026

Open

Zagreb, Zagreb, Croatia
Senior

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Senior penetration tester responsible for end-to-end security assessments of web applications, APIs, internal and external infrastructure, mobile applications and security configurations.

Responsibilities

Plan and execute penetration tests for web applications, APIs, internal and external infrastructure and other approved targets.
Identify, validate and safely exploit vulnerabilities within the agreed scope and rules of engagement.
Assess technical and business impact and provide clear, risk-based remediation recommendations.
Produce high-quality technical reports with reproducible evidence and executive-level summaries.
Present findings to customer technical teams and support remediation clarification and retesting activities.

Requirements

Nice to have: EU/NATO Secret Clearance
Nice to have: mobile application security testing
Nice to have: security configuration reviews
Nice to have: static application security analysis
Nice to have: dynamic application security analysis

Skills

web application security testing API security testing external network penetration testing

Junior Penetration Tester Internship

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Responsibilities

Requirements

Skills

Benefits

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Compensation

Responsibilities

Requirements

Skills

SECURITY ENGINEER

Responsibilities

Requirements

Skills

Benefits