Junior Penetration Tester

Salary: £25,000-£35,000

Department: Break

About Us

OnSecurity builds technology that makes tech businesses less likely to be targeted by cyber-criminals, and to ensure they are resilient to the inevitable cyber-attacks that will come their way. From our next-generation Pentesting and PtaaS, to our Scan and Radar products, OnSecurity is a single source of security for modern, tech-enabled businesses.

Job Description

As a Junior Penetration Tester at OnSecurity, you will be crucial in conducting penetration testing projects for clients spanning various sectors, including Telecoms, Fintech, Medtech, and Retail.

What You Will Do:

Conduct remote and occasional on-site penetration testing, encompassing but not limited to:

  • Web application and API penetration testing
  • Infrastructure (External & Internal) penetration testing
  • Mobile web application penetration testing
  • Cloud Audits
  • Aid in building and maintaining the OnSecurity testing network
  • Share expertise and insights within the testing team
  • Assist in ensuring the quality assurance of tests

To Qualify, You Will Have:

  • A strong passion for IT security, with a preference for testers who view IT security and pen testing as more than just a job, but also a hobby.
  • Solid technical proficiency in IT security testing methodologies and technologies. Possession of an industry-recognised qualification (such as OSCP, CRT, CCT) is desirable but not essential.
  • A team-oriented mindset, collaborating closely with other testers in the team.
  • Coding skills are advantageous (Python, Go, etc.) for tooling and automation development.


  • Competitive salary with regular pay reviews.
  • Healthcare benefits - All employees receive Vitality private Healthcare coverage.
  • 30 days of holiday - We encourage a healthy work-life balance by granting employees the flexibility to take the time they need to excel in their roles.
  • Seasonal company gatherings - Despite being a remote-first business, we value the opportunity to bring our team together throughout the year.
  • Remote-first with Bristol HQ - While we have an office in Bristol that all employees are welcome to use, we embrace and support remote work.
  • Flexible working arrangements - We trust our employees to manage their workload effectively, prioritizing business needs while accommodating personal schedules.

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