Offensive Security Specialist

About The Role :

As a Cybersecurity Offensive Specialist at Capgemini, you’ll play a critical role in strengthening our clients’ security posture by proactively uncovering and exploiting weaknesses in their systems. You’ll join a collaborative team of offensive and defensive experts—sharing insights with incident responders, purple teams, and architects—to drive continuous improvement across people, processes, and technology.

Responsibilities :

• Proactive Security Assessments




• Identify, analyze and prioritize vulnerabilities, misconfigurations, and design gaps in networks, applications, and infrastructure.


• Drive “security by design” improvements through clear, actionable recommendations.

• Collaboration & Knowledge Sharing




• Work closely with incident response, SOC, and purple‑team colleagues to translate offensive findings into enhanced detection and remediation strategies.


• Present technical findings and remediation roadmaps to both technical teams and executive stakeholders.

Key Activities

1. Vulnerability Assessment Specialist




• Configure and run automated scans (e.g. Nessus, Tenable.io) against target environments.


• Manually validate scan results, triage false positives, and assess business impact.


• Produce detailed assessment reports and present findings to clients.


• Contribute to purple‑team exercises to validate detection and prevention controls.




2. Penetration Testing Specialist




• Plan and execute scoped pentests—both manual and tool‑driven (e.g. Burp Suite, Metasploit, Cobalt Strike).


• Exploit identified weaknesses to validate risk, then propose realistic remediation steps.


• Evaluate the maturity of existing security controls and vulnerability management processes.


• Deliver comprehensive engagement reports and debrief sessions with client teams.




3. Red Teaming Specialist




• Design and run multi‑phased red‑team exercises emulating advanced persistent threat tactics, techniques, and procedures.


• Employ stealthy evasion and privilege‑escalation methods to demonstrate worst‑case impact.


• Evaluate and challenge blue‑team detection, response playbooks, and incident handling capabilities.


• Lead post‑exercise “lessons learned” workshops and help harden defenses.

Required Skills and Experience :

• Core Expertise




• 3+ years hands‑on experience in one or more offensive disciplines.


• Proven ability to translate technical findings into business‑oriented risk narratives.


• Excellent written and verbal communication skills.

• Vulnerability Assessment




• Mastery of vulnerability scanning platforms (e.g. Nessus, Rapid7, Qualys).

• Penetration Testing




• Deep familiarity with web, network, and API pentesting toolchains (Burp Suite, Cobalt Strike, Metasploit).

• Red Teaming




• Advanced skills in adversary emulation, covert C2, stealthy payload delivery, and lateral movement.

Additional Skills :

• Industry certifications such as OSCP, OSCE, CRTO, or GXPN.


• Scripting proficiency (Python, PowerShell, Bash) for automation and custom tooling.


• Experience testing cloud and container environments (AWS, Azure, GCP, Kubernetes).


• Prior work in regulated sectors (finance, healthcare, government)