OS Engineer

Description

Summary: Seeking a skilled Penetration Tester to support offensive security assessments and incident response activities, identifying vulnerabilities and simulating real-world attack scenarios across enterprise environments. Highlights: 1. Support offensive security assessments and incident response activities 2. Conduct web, network, cloud, and Active Directory penetration tests 3. Collaborate with DFIR, SOC, and security operations teams 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 **3****years 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