Penetration Tester

Company: Claranet
Apply for the Penetration Tester
Location: London
Job Description:

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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Posted: September 25th, 2026