Senior Penetration Tester - Web & Infrastructure

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AI Summary

Conduct web and infrastructure penetration testing. Lead Red Team activities. Provide cyber security consultancy. Collaborate with stakeholders. 3+ years of experience required.

Key Highlights
Web application & infrastructure penetration testing
Lead & participate in Red Team activities
Provide cyber security consultancy & expert recommendations
Key Responsibilities
Conduct web application, infrastructure, and application penetration testing
Lead and participate in Red Team and Blue Team activities
Perform security design reviews
Provide cyber security consultancy and technical guidance
Identify vulnerabilities, assess risks, and propose remediation measures
Prepare and deliver technical reports and presentations
Technical Skills Required
Web application penetration testing IT infrastructure penetration testing Network security architecture Vulnerability assessment UNIX/Linux & Windows system administration Python Shell scripting
Benefits & Perks
Relocation to Brussels later

Job Description


Want to Make Waves in Tech? GBT Solutions Is the Place to Be!🐝


About Us: GBT Solutions is a Portuguese technology company founded in 2018, part of the HFA Group established in 1995. With a focus on delivering cutting-edge solutions across various industries, we are committed to fostering a diverse and inclusive work environment and are proud to be recognized for our commitment to excellence and innovation.


Position: Penetration Tester

Location: Braine‑l’Alleud, Belgium (relocating to Brussels later)


Key Responsibilities

  • Conduct web application, infrastructure, and application penetration testing.
  • Lead and participate in Red Team and Blue Team activities.
  • Perform security design reviews to ensure compliance with internal security policies and standards.
  • Provide cyber security consultancy, technical guidance, and expert recommendations to project teams and operational stakeholders.
  • Identify vulnerabilities, assess risks, and propose effective remediation measures.
  • Coordinate with internal security and accreditation stakeholders, including:
  • Configuration Control Boards (CCB)
  • Security Accreditation Boards (SABs)
  • Security authorities and governance bodies
  • Other organisational units involved in security assurance
  • Prepare and deliver technical reports, executive summaries, and presentations for both technical and leadership audiences.
  • Support collaboration between internal and external stakeholders under the direction of the Penetration Testing Cell Lead.


Required Skills & Experience

Technical Expertise

Minimum 3+ years of experience in:

  • Web application penetration testing
  • IT infrastructure penetration testing
  • Network security architecture
  • Vulnerability assessment (OS, software, protocols, networks)
  • Evaluation of security tools and technologies
  • UNIX/Linux and Windows system administration
  • Penetration testing methodologies, tools, and techniques


Programming / Scripting

Experience with at least one of:

  • Python
  • Perl
  • Ruby
  • Shell scripting (Bash, KSH, CSH)


Security Knowledge

Strong understanding of:

  • System and network security
  • Authentication and security protocols
  • Cryptography
  • Application security
  • Malware techniques and protection mechanisms


Analytical & Communication Skills

Ability to:

  • Assess risks and define mitigation plans
  • Produce high‑quality technical documentation
  • Write clear executive summaries and remediation plans
  • Present findings to both technical and non‑technical audiences


Equal Opportunity: GBT Solutions is an equal opportunity employer and values diversity. We do not discriminate based on age, ethnicity, sexual orientation, gender, disability, or any other factor other than merit.


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