Find a job 
Featured Companies 
Featured Universities 
For Companies At a Glance
- Tasks: Conduct exciting penetration tests and mentor junior testers in a dynamic environment.
- Company: Join OnSecurity, a fast-growing cybersecurity scale-up redefining pentesting with AI.
- Benefits: Enjoy 30 days paid leave, private health insurance, and a competitive salary.
- Why this job: Make a real impact in cybersecurity while enjoying flexibility and growth opportunities.
- Qualifications: 2+ years of pentesting experience and strong communication skills required.
- Other info: Collaborative culture with regular socials and a focus on work-life balance.
The predicted salary is between 28000 - 48000 £ per year.
AI-Augmented Pentesting: Human Expertise Where It Matters Most. At OnSecurity, we’re redefining cybersecurity through AI-augmented penetration testing — the perfect blend of AI efficiency and human ingenuity. We deliver comprehensive, CREST-approved testing that saves time and money without compromising quality. Our all-in-one platform combines AI-driven automation with expert human insight to provide faster, more accurate results. The outcome? Streamlined testing, actionable intelligence, and security at scale. We’re revolutionising how organisations protect their digital assets helping businesses stay secure, resilient, and one step ahead of threats.
Working Hours and Location
We are based in the UK with employees working remotely. Some roles may have hybrid preference depending on the team. You can ask us about the best working hours and work setup in the recruitment process if there’s something that’s important to you. We try to be as flexible as possible. All we ask is that everyone is online between our core hours of 10:00-16:00 (UK time) so that everyone overlaps for the majority of the day. It’s up to you and your manager to find the right schedule that works for you and your team.
Role Purpose
As a Penetration Tester, you’ll play a central role in delivering high-quality, manual security testing to OnSecurity clients across a variety of sectors. You’ll take ownership of full test cycles; scoping, delivery, reporting, and client communication while helping to mentor junior testers and enhance OnSecurity’s technical capabilities. This role blends autonomy, technical depth, and real impact.
Role Importance, Responsibilities and Impact
What you will be doing:
- Delivering web, API, mobile, and infrastructure penetration tests remotely.
- Identifying, analysing, and exploiting vulnerabilities beyond automated tools.
- Producing detailed, high-quality reports for developers and security teams.
- Collaborating with internal testers to refine methodologies and tooling.
- Contributing to TestNet and methodology development.
- Mentoring Junior testers.
What you won’t be doing:
- Following rigid scripts, you’ll be encouraged to think critically and creatively.
- Getting lost in bureaucracy, we empower our testers to deliver results via our intuitive portal.
Timeline for Role Expectations
- Within 1 month: Become familiar with our testing platform and delivery process.
- Within 3 months: Lead your own engagements end-to-end and produce client-ready reports.
- Within 6 months: Contribute to internal tooling, mentor junior testers, and help shape new methodologies.
About You
This role is a great fit if you…
- Minimum 2 years’ experience delivering penetration tests in one or more disciplines.
- Strong knowledge of OWASP Top 10 and common vulnerability classes.
- Excellent written and verbal communication skills.
- Enthusiastic team player who values collaboration and quality delivery.
Compensation
What you will get for your hard work…. A competitive compensation package. The salary range for this role is roughly £35k – £60k annually, depending on experience. Work at one of the fastest-growing Cyber Security Scale-Ups revolutionising pentesting. A clear progression plan. We want you to keep growing. That means trying new things, leading others, challenging the status quo and owning your impact, always with our complete support. Flexibility: We promote life-work balance at OnSecurity. We encourage everyone on our team to enjoy their life and ensure they have the balance they need to reach their full potential. Work where you work best. We’re a distributed team. If you live in Bristol, we have a hybrid approach, if this is something that fits for your team. Otherwise, we are remote, and so we build our ways of working around this.
Other benefits
- 30 days of paid annual leave, plus bank holidays.
- Company Pension Scheme.
- Private Health Insurance with Vitality.
- Employee Assistance Program (EAP).
- Group Life Assurance (x4 salary).
- Enhanced Maternity, Paternity, and Adoption Leave.
- Paid study leave for employees to level up their skills.
- Mentorship and Coaching.
- Annual Performance reviews and recognition for high performance.
- Regular socials and activities, online and in-person.
Penetration Tester in Bristol employer: Onsecurity
Contact Detail:
Onsecurity Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Penetration Tester in Bristol
✨Tip Number 1
Network like a pro! Reach out to fellow penetration testers and cybersecurity enthusiasts on platforms like LinkedIn. Join relevant groups and participate in discussions to get your name out there and learn about potential job openings.
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your pentesting projects, including detailed reports and methodologies. This will not only demonstrate your expertise but also give you something tangible to discuss during interviews.
✨Tip Number 3
Prepare for technical interviews by brushing up on your knowledge of the OWASP Top 10 and common vulnerabilities. Practice explaining your thought process when tackling security challenges, as this will highlight your critical thinking skills.
✨Tip Number 4
Don’t forget to apply through our website! We love seeing candidates who are genuinely interested in joining our team. Tailor your application to reflect your passion for AI-augmented pentesting and how you can contribute to our mission.
We think you need these skills to ace Penetration Tester in Bristol
Some tips for your application 🫡
Tailor Your CV: Make sure your CV is tailored to the Penetration Tester role. Highlight your experience with manual security testing, and don’t forget to mention your knowledge of OWASP Top 10. We want to see how your skills align with what we do!
Craft a Compelling Cover Letter: Your cover letter is your chance to shine! Share your passion for cybersecurity and explain why you’re excited about AI-augmented pentesting. Let us know how you can contribute to our mission at OnSecurity.
Showcase Your Communication Skills: Since excellent written communication is key for this role, make sure your application is clear and concise. Use proper formatting and check for any typos. We appreciate attention to detail!
Apply Through Our Website: We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for the role. Plus, it’s super easy!
How to prepare for a job interview at Onsecurity
✨Know Your Stuff
Make sure you brush up on your penetration testing knowledge, especially the OWASP Top 10 and common vulnerabilities. Be ready to discuss your past experiences and how you've tackled real-world security challenges.
✨Show Off Your Communication Skills
Since you'll be producing detailed reports and communicating with clients, practice explaining complex technical concepts in simple terms. This will demonstrate your ability to convey important information clearly and effectively.
✨Be Ready to Think Outside the Box
OnSecurity values creativity in problem-solving, so prepare for scenario-based questions that require critical thinking. Think about how you would approach a penetration test without relying solely on automated tools.
✨Ask About Team Dynamics
Since collaboration is key, don’t hesitate to ask about the team structure and how they work together. This shows your interest in being a team player and helps you understand how you can fit into their culture.
