Penetration Tester
CV-LibraryLS1, Leeds, West YorkshirepermanentPosted: 30 July 2026
Apply NowEssential Roles & Responsibilities
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
* Delivering targeted research and development in line with direction of the business
* If not achieved already, working towards CREST qualifications; CPSA, CRT and CCT
Essential Technical:
* 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
Essential Experience:
* Delivering chargeable web app testing engagements
* Providing remediation advice
* Producing accurate technical reports
* Working under pressure of deadlines and structuring workload accordingly
* Problem-solving, helping others to understand complex ideas
Essential General:
* 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
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
* Public speaking experience
* Full UK driving license
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
* Delivering targeted research and development in line with direction of the business
* If not achieved already, working towards CREST qualifications; CPSA, CRT and CCT
Essential Technical:
* 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
Essential Experience:
* Delivering chargeable web app testing engagements
* Providing remediation advice
* Producing accurate technical reports
* Working under pressure of deadlines and structuring workload accordingly
* Problem-solving, helping others to understand complex ideas
Essential General:
* 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
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
* Public speaking experience
* Full UK driving license