26 to 36 of 36 Penetration Testing Jobs in the City of London

gaps and resolve team resourcing challenges. Ensure infrastructure availability, scalability, performance, and alignment with corporate IT strategy. Maintain secure, compliant infrastructure environments with robust documentation. Oversee operational and security testing, including penetration testing. Keep stakeholders informed on progress and risks. If you think you hit the mark, please apply or email me oscar.saadet@lafosse.com More ❯

Penetration Tester – Infrastructure Salary: £70,000–£100,000 (depending on experience) Location: Hybrid – London (2 days per week on-site) Note: To be eligible for this role, you must be eligible for UK Security Clearance (SC). A high-performing digital security team is looking for an experienced Infrastructure Penetration Tester to join them in delivering critical assessments … across complex and sensitive client environments. This is a hands-on internal testing role, not web application focused, where you'll be expected to work independently and navigate challenging systems with confidence. This role is suited to testers who thrive in technically demanding scenarios, want autonomy, and are motivated by work with real-world impact. Key Responsibilities Conduct internal … infrastructure and Active Directory penetration tests in live production environments Produce clear, concise reports tailored to both technical and non-technical audiences Build trusted relationships with clients in a consultancy-facing capacity Work within a small, high-trust team on sensitive engagements Contribute to the evolution of internal tooling and testing methodologies Operate effectively in environments with limited More ❯

break things (ethically) and make the digital world safer? We're on the hunt for a Security Consultant to join our top-tier cyber team! What you'll do: Penetration testing & red teaming across on-prem, cloud & hybrid Hack into AD, Entra ID (Azure AD), AWS, GCP, and more Work with remediation teams to fix real-world issues … Help shape our tools & testing methods Collaborate, share, and grow with a supportive team What we're looking for: Proven offensive security skills Strong knowledge of AD & cloud platforms Curiosity and willingness to learn beyond your comfort zone Ideally working towards, or already hold CSTM or CRT Why Sapphire? Cutting-edge projects Inclusive culture Real impact on client security More ❯

and vulnerabilities, leveraging threat intelligence to proactively mitigate risks Perform proactive threat hunting, research, and analysis, delivering actionable intelligence to IT and security teams Perform security assessments, audits, and penetration testing using industry-standard methodologies and tools. Work with key software and service vendors to manage security products and solutions. Undertake ongoing security training and certifications relevant to More ❯

Penetration Tester – Infrastructure Focus 📍 Location: London preferred (Hybrid) 💸 Salary: £70,000 – £105,000 (London) 🧠 Level: Senior Consultant to Principal Consultant (SC–PC) ⏱ Flexible hybrid model | High-trust culture | Mission-critical work 🧭 The Opportunity Join a high-impact consultancy at the forefront of innovation and digital transformation. You’ll be part of a specialist team delivering critical infrastructure penetration … in the UK — from defence and national security to critical infrastructure and operational technology. This is not a web application role . We’re looking for an infrastructure-focused penetration tester with the technical confidence and consultancy mindset to work independently, lead engagements, and deliver real-world impact. If you want to push beyond checklists and automated scans and … into deep, hands-on testing — this is the place to do it. 🔧 What You’ll Be Doing Deliver end-to-end infrastructure and internal network testing (Active Directory, internal corporate networks, etc.) Identify and exploit vulnerabilities across complex environments with minimal documentation Communicate technical findings through clear written reports and debriefs to a range of stakeholders Support sensitive More ❯

a growing FinTech, building cutting edge trading platforms for hedge funds and investment managers around the world. In London, they’re looking for an Application Security Engineer, with strong Penetration Testing experience, to join them. This is an initial 6 month contract, hybrid working (3 days a week in the office), outside IR35 and paying ~£550 - £600 per … part of a security -focused transformation and you’ll be responsible for identifying and mitigating security vulnerabilities, and risk, within their applications. You’ll focus on building security tools, penetration testing and performing security assessments, whilst updating internal security processes and documentation in the process. Required: Strong experience as an App Sec Engineer Extensive experience of Penetration Testing Hands-on experience with tools such as Burp Suite and Metasploit Capable of designing Security policies, procedures and best practices The ability to investigate and respond to Security related incidents within applications, and work closely with Dev teams throughout API Testing experience (with the likes of REST and Postman) would be ideal More ❯

Develop CTI tactical, operational and strategic intelligence framework and processes Threat hunting - Develop and lead structured threat hunting campaigns-based threat intelligence, MITRE ATT&CK, and risk models Pen Testing - Support internal testing of hypotheses and validation of remediation from pen tests You will be experienced and hands-on with a Cyber Threat Intelligence and Threat Hunting Specialist … Manager, you will support designing, building and operationalising the threat intelligence and proactive detection capabilities within the SOC. The primary focus is on CTI development and structured threat hunting, penetration testing and offensive security experience is a significant plus, to support internal simulation, and validation of remediation capabilities. This is an initial 6-month contract, 40% on site More ❯

Work within Infrastructure team in supporting and delivering all aspect of services - BAU encompassing networks, telephony, PABX, voice recording, desk moves and changes - Support annual Disaster Recovery invoking/testing - Contribute to design, build and implementation of firewall solutions from perimeter to DMZ roles - Develop, maintain and deliver global standards to all networking devices - Interpret network security reports - Assist … with seamless migration of network estate to newly adopted security framework - Facilitate internal/external Audits and Penetration Testing. Remediation Technical Skills -In-depth knowledge of CISCO including firewalls, switches and routing protocols -In-depth knowledge of supporting a datacentre with branch interconnectivity (LES circuits) -CISCO certification, required CCNA -VPN technologies (IPSEC) -Security certification (advantageous) Technologies Layer 2 Switching More ❯

Work within Infrastructure team in supporting and delivering all aspect of services - BAU encompassing networks, telephony, PABX, voice recording, desk moves and changes - Support annual Disaster Recovery invoking/testing - Contribute to design, build and implementation of firewall solutions from perimeter to DMZ roles - Support IPS deployment for European sites - Develop, maintain and deliver global standards to all networking … devices - Interpret network security reports - Assist with seamless migration of network estate to newly adopted security framework - Facilitate internal/external Audits and Penetration Testing. Remediation - Treasury solutions such as IPC turrets General Skills -Experience working within mission-critical environments -Experience in operational deployments -Maintains required industry recognised skills through training and self-study methods Technical Skills -In-depth More ❯

Penetration Tester - Infrastructure/OT (Consultancy | Mostly Remote | Not for Beginners) Right. Let’s skip the fluff. One of our consultancy clients needs an experienced Infrastructure Pen Tester. Not someone who wants to be a Pen Tester. Not someone halfway through their OSCP. Someone who's been there, and got some of the battle scars already. They work with … sort of environments where “turning it off and on again” could cost millions. So yeah, it’s not your average test. The Job (in plain English): You’ll be testing infrastructure - manually. No Web App fluff, no clicking “scan” in a tool and writing up the results. You’ll be dealing with proper kit and real-world impact. A … lot of autonomy, and the expectation that you can figure things out without someone holding your hand. What You Actually Need: Hands-on experience with infrastructure pen testing - and we mean proper hands-on. Experience in OT environments - You’ve been there, done that, ideally not blown anything up. Brains - Able to look at a scope, figure it out More ❯

CHECK Certified/Penetration Tester/Outside IR35/550 pd/6 Month/Remote I'm looking to speak to highly skilled Pentesters, with recent hands on experience and well-versed in Consultancy environments that hold CHECK certification . Recent hands-on experience and C-Suite stakeholder management will be paramount in this role. The consultancy has … to remediate discovered vulnerabilities. Develop detailed reports with findings and recommendations. C-Suite stakeholder management across the client and consultancy. Non-negotiable experience required: 4+ years experience in a Penetration testing role. CHECK Certification . Proven track record of working closely with and reporting to executive level stakeholders . The role is open for applications from 05/… or get in contact with me directly (Ben Sheppard) if this role is a good fit, email an updated copy of your CV to ben.sheppard@sr2rec.co.uk CHECK Certified/Penetration Tester/Outside IR35/550 pd/6 Month/Remote More ❯