Senior Penetration Tester

Salary: £55,000+

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

OnSecurity seeks a skilled senior penetration tester to conduct testing projects across various sectors, including Telecoms, Fintech, Medtech, and Retail. Additionally, you will contribute to team development through testnet participation and methodology refinement. Responsibilities:

Perform remote and on-site penetration testing, covering:

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


  • Minimum 4 years of experience in delivering penetration testing across various disciplines, including infrastructure, web app, mobile app, social engineering, and OSINT.
  • 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.
  • Strong technical knowledge of IT security testing methodologies and technology. Possession of an industry-respected qualification (OSCP, CRT, CCT) is desirable but not essential.
  • Team-oriented mindset, collaborating closely with other testers in the team.
  • Coding skills (Python, Go, etc.) for tooling and automation development are beneficial.


  • Competitive salary with regular pay reviews.
  • Healthcare benefits, including Vitality Private Healthcare.
  • 30 days of holiday allowance to maintain work-life balance.
  • Seasonal company gatherings to foster team spirit.
  • Remote-first with a Bristol HQ, offering flexibility for remote work.
  • Flexible working arrangements, prioritizing business needs while accommodating personal schedules.

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