Thales

Offensive Security Engineer (Penetration Testing | Red Team | Adversary Simulation)

Thales  •  Portuguese Republic (Hybrid)  •  19 hours ago
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Job Description

Location: Leca do Balio, Portugal

About the Role

We are looking for a skilled Penetration Tester to support offensive security assessments and incident response activities across enterprise environments.

In this role, you will identify vulnerabilities, simulate real-world attack scenarios, and collaborate closely with DFIR, SOC, and security operations teams The position combines advanced penetration testing with hands-on support during cyber incidents, threat investigations, and continuous security improvement initiatives.

Key Responsibilities

  • Conduct web, network, cloud, and Active Directory penetration tests using modern offensive security techniques and tools.

  • Support incident response engagements, including forensic analysis, threat hunting, containment validation, and attacker activity reconstruction.

  • Prepare detailed technical reports and executive summaries with clear, actionable remediation recommendations.

  • Collaborate with blue team, DFIR, SOC, and security engineering teams to improve detection capabilities and validate security controls.

  • Contribute to strengthening the organization’s cyber resilience through proactive testing and technical analysis.

Requirements

  • Minimum 3years of experience in penetration testing or offensive security roles.

  • Strong hands-on experience in:

    • Web and API security testing

    • Network and infrastructure assessments

    • Cloud security testing

    • Active Directory security

  • Experience supporting or collaborating with incident response (DFIR) teams

  • Ability to communicate technical findings clearly to both technical and non-technical stakeholders

  • Portuguese (C1) and English (C1) proficiency.

  • Availability for medium travel

Preferred Qualifications

  • Offensive Security certifications:

    • OSCP, OSEP, OSWE

  • SANS certifications:

    • GPEN, GCFA

  • Experience in:

    • Threat hunting and forensic analysis

    • Security validation and purple teaming

    • Attack simulation and adversary techniques

What We Offer

  • Competitive compensation package and benefits.

  • Opportunity to work on advanced offensive security and incident response projects

  • Continuous training and access to certifications and learning programs

  • Collaborative environment with SOC, DFIR, and Threat Intelligence teams

  • Hybrid/office flexibility (depending on local policy) and international exposure


YOUR CAREER AT THALES

Future opportunities will allow you to discover other domains or sites. You will be able to evolve and grow your competences in different areas:

Room and attention to personal development
Build your talents in another domain of Thales Group, discovering new products, new customers, new country or go to a more complex Solution
Choose between a technical expertise or a leadership path
Build an international career within a leading Engineering Group

Thales

About Thales

Thales (Euronext Paris: HO) is a global leader in advanced technologies for the Defence, Aerospace, and Cyber & Digital sectors. Its portfolio of innovative products and services addresses several major challenges: sovereignty, security, sustainability and inclusion.

The Group invests more than €4 billion per year in Research & Development in key areas, particularly for critical environments, such as Artificial Intelligence, cybersecurity, quantum and cloud technologies.

Thales has more than 83,000 employees in 68 countries. In 2024, the Group generated sales of €20.6 billion.

Industry
Aviation & Aerospace
Company Size
10,000+ employees
Headquarters
Meudon, FR
Year Founded
Unknown
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