> Markdown version of [/jobs/ext/1392716-penetration-tester](https://www.wearedevelopers.com/jobs/ext/1392716-penetration-tester). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Penetration Tester - **Company:** M Group Ltd - **Location:** London, UK - **Experience:** Experienced - **Contract:** Permanent contract - **Skills:** Microsoft Windows, Apple Mac Systems, Software System Penetration Testing, Microsoft Azure, Bash Shell, Cyber Security, Linux, Python (Programming Language), Network Protocols, Nmap, Windows PowerShell, Kusto Query Language, SQL Databases, Wireshark, Scripting, SC Clearance - **Published:** July 23, 2026 - **Apply:** https://uk.indeed.com/viewjob?jk=5140a4fdfe1dd30e ## About the Role * Minimum of 2 years proven experience of penetration or security testing * Good organisation skills, with strong attention to detail and excellent written and verbal communication skills * CRT / OSCP / Cyber Scheme accreditation * Good team ethic and the desire to accelerate your Penetration Testing career * Eligible for UK Security Clearance * Experience with Networks and infrastructures * Experience with Windows, Linux, and Mac operating systems * Knowledge of embedded computer systems * Experience with conducting tests on networks and applications * Experience with conducting security audits * Experience with analysing security policies * Experience with writing security assessment reports * Certification as a Cyber Essentials Plus Lead Assessor is desirable but not essential * Experience with M365, Azure, Sentinel * Relevant experience in a Security Operations environment or similar environment. Ideally Sentinel * Understanding of networking protocols, routing & firewall functionality * Hands-on experience with security technologies, including Network * Mapping and Analysis tools - nmap, Wireshark etc. * Some experience with any scripting, such as SQL, KQL, Python, Bash,PowerShell * Knowledge and experience with Windows and Linux Operating Systems ## Description We're looking for a passionate and technically curious Penetration Tester to join our Offensive Security Testing team. In this role, you'll help identify and assess security vulnerabilities across applications, systems, and networks, supporting clients in strengthening their cyber resilience. Working alongside experienced security professionals, you'll deliver penetration testing engagements, document findings and recommendations, and continuously develop your skills with the latest tools, techniques, and emerging threats. You'll also collaborate with colleagues across the wider cyber security function, contribute to awareness activities, and support ongoing innovation within the team. This is an excellent opportunity for someone looking to build a rewarding career in offensive security and cyber defence. ## Related Videos - [Security Pitfalls for Software Engineers](https://www.wearedevelopers.com/videos/726-security-pitfalls-for-software-engineers) - [How I saved 200K/yr in direct costs writing 0 code lines in K8s](https://www.wearedevelopers.com/videos/1055-how-i-saved-200k-yr-in-direct-costs-writing-0-code-lines-in-k8s) - [Docker network without Docker](https://www.wearedevelopers.com/videos/1418-docker-network-without-docker) - [Let’s write an exploit using AI](https://www.wearedevelopers.com/videos/1004-let-s-write-an-exploit-using-ai) - [MySQL Protocol Features You Should Be Aware Of](https://www.wearedevelopers.com/videos/100267-mysql-protocol-features-you-should-be-aware-of) - [Docker exec without Docker](https://www.wearedevelopers.com/videos/1094-docker-exec-without-docker) ## Related Articles - [9 Ways to Make Money Hacking](https://www.wearedevelopers.com/magazine/333-9-ways-to-make-money-hacking) - [The 8 Best Code Testing Tools](https://www.wearedevelopers.com/magazine/402-the-8-best-code-testing-tools) - [Dev Digest 191: Malware interviews, EU ❤️ Open Source and Skilled Agents](https://www.wearedevelopers.com/magazine/645-dev-digest-191-malware-interviews-eu-open-source-and-skilled-agents) - [Dev Digest 134 - Where pixels sing?](https://www.wearedevelopers.com/magazine/477-dev-digest-134-where-pixels-sing) - [Dev Digest 182: GPT5 Prompts, MCP Vulnerabilities, Code Traps](https://www.wearedevelopers.com/magazine/622-dev-digest-182-gpt5-prompts-mcp-vulnerabilities-code-traps) - [Events like RSAC Get You CISOs. Developers Decide What Actually Gets Deployed.](https://www.wearedevelopers.com/magazine/693-events-like-rsac-get-you-cisos-developers-decide-what-actually-gets-deployed)