
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 (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.