Penetration Tester

DGH Recruitment; Greater London; On-site; GBP 70,000 - 100,000; Full time

Job summary

DGH Recruitment Limited is seeking a skilled Penetration Tester to join a leading client in London. You will lead and support testing across web applications, APIs, and network infrastructure, working with clients to define objectives and scope.

You will apply manual and tool-assisted techniques using Kali Linux, Burp Suite, Nmap, and vulnerability scanners, reporting findings to both technical and non-technical stakeholders. Knowledge of OWASP, PTES, and MITRE ATT&CK will guide your work.

Qualifications

• Client-facing penetration testing experience across web apps, APIs, or networks.
• Strong manual testing capability with automated tools.
• Familiarity with OWASP, PTES and MITRE ATT&CK; scripting ability.

Responsibilities

• Lead and support penetration testing engagements across web applications, APIs, and networks.
• Define objectives, scope and rules of engagement with clients.
• Apply manual and tool-assisted testing techniques using recognised frameworks.
• Deliver assessments and verify remediation to certification standards.
• Produce clear deliverables and present findings to stakeholders.
• Stay updated with current security benchmarks and cloud/network security topics.

Skills

Client-facing

Penetration testing

Scripting (Python/PowerShell/Bash)

Knowledge of web/API security

Team collaboration

Tools

Kali Linux

Burp Suite

Nmap

Qualys

Nessus

Job description

DGH Recruitment are currently recruiting on behalf of a leading client in the Accountancy industry who require a Penetration Tester to join the firm in London.

Key Responsibilities:

• Lead and support penetration testing engagements across web applications, APIs, and internal and external network infrastructure.
• Work with clients to define objectives, agree scope and rules of engagement, and plan testing that meets their assurance needs.
• Apply manual and tool-assisted testing techniques aligned with recognised methodologies and frameworks, including the OWASP Web Security Testing Guide, PTES, and MITRE ATT&CK.
• Deliver Cyber Essentials Plus assessments, including scoping, conducting the required technical tests, verifying remediation and supporting clients through to certification in line with current NCSC and IASME scheme requirements.
• Deliver wider technical security assessments, including vulnerability assessments, cloud security reviews, and build and configuration reviews against CIS Benchmarks and vendor hardening guidance.
• Produce clear, high-quality deliverables and present findings to technical and non-technical stakeholders.

Required Skills:

• Professional experience delivering client-facing penetration tests across web applications, APIs, and internal or external network infrastructure, independently and/or as part of a team.
• Strong manual testing capability and sound judgement in selecting and using automated tools, with practical experience of Kali Linux, Burp Suite, Nmap, and Qualys or Nessus.
• Familiarity with recognised penetration testing methodologies and frameworks, together with the ability to script or automate tasks using Python, PowerShell, Bash, or a comparable language.
• Good knowledge of modern web architecture, common web and API vulnerabilities, TCP/IP, Windows and Linux security, and Active Directory and Microsoft Entra ID attack paths.
• Experience delivering, or the ability to deliver, wider technical assessments such as vulnerability assessments and configuration reviews against recognised benchmarks such as CIS.
• Working knowledge of the Cyber Essentials and Cyber Essentials Plus schemes. Existing assessor experience is beneficial; appropriate training will be provided where required.