Penetration Tester

Overview

Penetration Tester - UK Remote Linux / Windows Python, PowerShell, Bash

Are you passionate about ethical hacking and ready to take your skills to the next level? We’re hiring a Penetration Tester to join a growing cyber team delivering CREST-aligned security services. You’ll simulate real-world attacks, uncover vulnerabilities, and help clients strengthen their defenses - all while working with cutting-edge tools and frameworks.

Responsibilities

• Perform web, infrastructure, wireless & cloud penetration tests (OWASP, PTES).
• Scope engagements and define testing objectives with clients.
• Identify, exploit, and report vulnerabilities with clarity and precision.
• Provide actionable remediation advice.
• Stay ahead of emerging threats and tools.

Qualifications

• Experience in penetration testing across multiple domains.
• Working at a cyber team consulting team delivering CREST-aligned security services
• Strong knowledge of OWASP Top 10, PTES, MITRE ATT&CK.
• Proficiency in Linux/Windows and scripting (Python, PowerShell, Bash).
• Excellent communication and reporting skills.

Certifications

• CREST CPSA or CRT, OSCP (essential)
• OSEP, OSWE, GWAPT, GPEN, CHECK (desirable)

Why Join?

• Diverse, challenging projects
• Career development aligned with SFIA Level 5
• Supportive, collaborative team culture

Application details

All our roles are UK based. When submitting your application to Colossus, please ensure the following:

• Your CV has your address and postcode.
• You also have your correct phone number and email address so we can contact you asap regarding your application.
• For confidentiality purposes, please remove any reference contact phone number’s and email address details from your CV.

Seniority level

• Associate

Employment type

• Full-time

Job function

• Information Technology

Industries

• Sound Recording and Data Security Software Products

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• Experience in penetration testing across multiple domains.
• Working at a cyber team consulting team delivering CREST-aligned security services
• Strong knowledge of OWASP Top 10, PTES, MITRE ATT&CK.
• Proficiency in Linux/Windows and scripting (Python, PowerShell, Bash).
• Excellent communication and reporting skills.

Certifications

• CREST CPSA or CRT, OSCP (essential)
• OSEP, OSWE, GWAPT, GPEN, CHECK (desirable)