Penetration Tester

Company: 83zero Limited
Apply for the Penetration Tester
Location: London
Job Description:

Offensive Security Consultant / Penetration Tester£500 per Day | Inside IR35 | Fully Remote | 12-Month ContractWe are working with a

leading global cyber security vendor

looking for an experienced

Offensive Security Consultant / Penetration Tester

to join their Professional Services team on an initial 12-month contract.This is an excellent opportunity to work on complex enterprise security engagements, delivering penetration testing, adversary simulations and red team exercises for customers across a range of industries.Key ResponsibilitiesConduct hands-on penetration testing across enterprise networks, cloud environments (AWS, Azure, GCP), web applications, APIs and mobile platforms.Plan and execute

red team and purple team exercises , aligned with frameworks such as MITRE ATT&CK.Identify vulnerabilities, develop proof-of-concept exploits and demonstrate potential security risks.Conduct Active Directory security assessments and exploitation testing.Support phishing simulations, social engineering and other adversary simulation activities.Produce detailed technical reports, communicate findings to customers and recommend remediation strategies.Work directly with enterprise customers and internal Professional Services teams.Skills & ExperienceStrong hands-on experience in

penetration testing, offensive security or red teaming .Practical experience with tools such as

Burp Suite, Metasploit, Cobalt Strike, Nmap, BloodHound and Empire .Scripting experience using

Python, PowerShell, Bash or Go .Good understanding of Active Directory, cloud security, container security and web/API vulnerabilities.Knowledge of

MITRE ATT&CK and OWASP Top 10 .Experience delivering customer-facing security assessments and presenting technical findings.Certifications such as

OSCP, OSEP, OSWE, OSCE, GPEN, GWAPT or GPEN-equivalent qualifications

would be advantageous.Contract DetailsRate:

£500 per dayIR35:

Inside IR35Duration:

Initial 12 monthsLocation:

Fully RemoteClient:

Leading Global Cyber Security VendorInterested?If you’re an experienced Penetration Tester or Offensive Security Consultant looking to work with a globally recognised cyber security organisation, we’d love to hear from you.Apply now or get in touch to discuss the opportunity in more detail.

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Posted: October 27th, 2026