Penetration Tester

Bytes Group; Leatherhead; On-site; GBP 40,000 - 65,000; Full time

Job summary

Bytes Group is seeking a penetration tester within the Assurance Testing team of the Cyber Consulting department. You will conduct penetration testing across multiple environments, working under a team lead to deliver high-quality security testing and consulting services for a diverse client base.

Ideal candidates have 1–3 years of experience, a BSc or equivalent, and the ability to pass BPSS or HMG vetting.

Qualifications

• BSc degree or 3 years relevant experience.
• Essential: penetration testing and security consulting capabilities.
• Ability to pass BPSS or HMG vetting requirements.
• Strong customer focus and excellent communication.
• Willingness to learn and grow in a fast-moving security landscape.

Responsibilities

• Perform penetration testing assignments across infrastructure, web apps, APIs, mobile apps, red team and cloud configurations.
• Collaborate with team leader on internal projects and service improvements.
• Work with sales to scope opportunities and create proposals for delivery.
• Manage customer engagements to ensure timely, high-quality deliverables.

Skills

Penetration testing

Vulnerability analysis

Security consulting

Customer-focused

Ethical mindset

Education

BSc degree or 3 years relevant experience

Job description

Posted Wednesday 12 August 2026 at 01:00

POSITION DETAILS:

Position Title:

Reports to (POSITION):

Head of Assurance Testing

Team:

Assurance Testing

Department:

Cyber Consulting

Grade ( If Applicable ):

PURPOSE OF JOB:

(OVERALL DESCRIPTION OF THE POST WITHIN THE TEAM AND ORGANISATION)

Bytes is a CREST-certified penetration testing organisation with ambitious growth and expansion plans. We are looking for motivated individuals to join our testing team and work with a wide range of customers across all aspects of penetration testing. This role offers the opportunity to be part of a highly skilled and collaborative team, delivering high-quality testing and security consulting services in real-world environments.

We welcome candidates with either a broad set of skills or a focus on specific areas within penetration testing. Whether you're experienced or looking to grow, this role is ideal for anyone who has been providing penetration testing or security consulting services and wants to gain further experience, achieve new certifications, or simply work with a great team.

You will be working under the guidance of a team leader or Head of Assurance testing and will be actively involved in client engagements, while also having dedicated time to develop your skills and work towards industry-recognised certifications. A willingness to learn, adapt, and continuously improve is essential. Just as important is a mindset focused on collaboration, sharing knowledge, supporting peers, and contributing to a culture of growth.

In addition to hands-on testing work, you will also collaborate with the sales team to ensure appropriate scoping of new business opportunities. This includes providing technical input and helping to create accurate, well-defined proposals that set the foundation for successful project delivery.

This is an excellent opportunity for someone who is passionate about cybersecurity and is looking to progress their career as a penetration tester within a forward-thinking and supportive environment.

KEY RESPONSIBILITIES:

• Perform penetration testing assignments aligned with expertise, covering infrastructure, web applications, APIs, mobile applications, red team, and cloud configuration reviews. Delivering high-quality penetration testing services that provide real value to customers.
• To work under the direction of your team leader or head of Assurance testing on internal projects, research, development, as well as increasing the effectiveness of our services by bringing new ideas and ways of working
• Collaborate with the sales team to ensure appropriate scoping of new business opportunities and creation of proposals for successful engagement delivery.
• Manage customer engagements to ensure high-quality and timely deliverables.

INDIVIDUAL RESPONSIBILITIES:

• Delivering penetration testing services to customers as part of a team
• Provide technical assistance and support to colleagues, leveraging your expertise to foster knowledge sharing, collaborative problem‑solving, and a productive team environment.
• Conduct quality assurance reviews of reports and proposals to ensure accuracy and adherence to industry standards.
• Collaborate with the team to maintain and update the vulnerability database, ensuring it stays accurate and comprehensive
• Support scoping calls and collaborate with account managers to define penetration testing requirements, provide technical input, and ensure seamless client interactions and service delivery.
• Improving knowledge and capability through both on the job learning and self-study, preparation for exams and bringing an enthusiastic can‑do attitude
• Delivering high quality engagements to customers and delivering real value to them

WIDER TEAM NETWORK

(WHICH TEAMS WILL THE POSITION WORK WITH DIRECTLY AND WHO WILL THEY RELATE TO EXTERNALLY)

Internal

• Other Cyber Consulting teams
• Sales teams
• Pre‑Sales teams
• Security team
• IT

External

• Customers

QUALIFICATIONS, EXPERIENCE, & SKILLS:

( DELETE AS REQUIRED IF ESSENTIAL OR DESIRABLE, REMOVE UNNECESSARY REQUIRENENTs)

Educational Qualifications:

• BSc degree or 3 years relevant experience

ESSENTIAL

Professional Qualifications

ESSENTIAL

Years of Experience

• 1 to 3 years penetration testing / security experience
• 1 year penetration testing consulting experience

ESSENTIAL

DESIRABLE

Other Requirements

• Ability to pass BPSS or HMG SC vetting requirements.
• Ability to adapt to a fast-moving security landscape and keep pace with latest thinking.
• Strong customer focus – able to meet the demands of internal and external customers.
• Excellent communication skills – providing verbal and written communication that are outstanding to your team leader and Head of Assurance testing as well as other stakeholders including customers.
• Can make decisions that are well informed and timely with some direction and guidance.
• Good time management, can handle conflicting priorities, and deliver excellent levels of quality.

ESSENTIAL

(INCLUDE CORE COMPETENCIES & SKILLS REQUIRED FOR THIS POSITION BASED ON THE GRADE)

• Cyber Security, Vulnerability analysis and penetration testing skills and experience
• Business acumen
• Friendly and approachable
• Calm and considered
• Strong code of ethics and morals

MEASURES & GOALS

(HOW WILL THE SUCCESS OF THE PERSON IN THIS POSITION BE MEASURED – WHAT ARE THE EXPECTED OUTPUTS)

OBJECTIVE

MEASURE

FREQUENCY

Quality output / attention to detail

Feedback from QA team and customer engagements

Positive engagement with management, stakeholders, peers, and customers

Feedback whether positive or negative from personnel engaged with

Positive engagement with team and demonstration of team skills