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Penetration Tester
Job in
Greater London, London, Greater London, W1B, England, UK
Listed on 2026-09-26
Listing for:
Claranet
Full Time
position Listed on 2026-09-26
Job specializations:
-
IT/Tech
Cybersecurity
Job Description & How to Apply Below
As a Penetration Tester at Claranet, you will able to deliver you own web application tests and through training and partnering, you will be involved in a full range of testing work from mobile app and infrastructure testing to social engineering and Red Team exercises.
Key Responsibilities:- Undertaking web and mobile application testing and infrastructure testing engagements
- Using the opportunities provided by the business to improve skills and capabilities into all areas of testing
- Working with key clients providing bespoke consultancy, analysis and expertise
- Collaborating with other Claranet Business Units on large client digital transformation projects
- Assisting with pre/post sales activities as required
- Encouraging a positive, proactive, collaborative and solution-oriented approach among colleagues
- Communicating within Claranet and with clients, both orally and in writing
- Contribute to the writing and publishing of whitepapers and advisories
- Developing and delivering webinar content
- Delivering targeted research and development in line with direction of the business
- If not achieved already, working towards CREST qualifications; CPSA, CRT and CCT
- Have a good understanding of web & mobile application and infrastructure testing and methodologies
- Able to manually and proficiently exploit web application and network infrastructure vulnerabilities
- Have a logical and time-conscious approach to report writing
- Have a working knowledge of common programming languages such as C, C++, C#, Java
- Have experience of at least one scripting language such as Ruby, Python or Perl
- Providing remediation advice
- Producing accurate technical reports
- Working under pressure of deadlines and structuring workload accordingly
- Problem-solving, helping others to understand complex ideas
- Client facing, able to confidently and professionally represent the company
- Must be self-motivated and able to work in an independent manner as well as part of a team
- Excellent written and oral communications skills
- Positive, collaborative and enthusiastic
- Conducting penetration testing work out of normal office hours on occasion
- Willing to travel to deliver onsite work as required
- Appetite to shadow, train and develop to improve capabilities into all areas of security testing
- Security clearance (or eligibility for clearance)
- CTM or CTL status
- CISSP, CISA, CEH, OSCP or equivalent reputable information security certifications
- Familiarity with testing cloud environments
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