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Penetration Tester

Job in Greater London, London, Greater London, W1B, England, UK
Listing for: Claranet
Full Time position
Listed on 2026-09-26
Job specializations:
  • IT/Tech
    Cybersecurity
Salary/Wage Range or Industry Benchmark: 55000 - 95000 GBP Yearly GBP 55000.00 95000.00 YEAR
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
In Addition, The Following Are Highly Desirable:
  • 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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