Penetration Tester (CST) Job Vacancy in Claranet Home Based – Updated today

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Job Description : About The Role

The primary function of the Security Analyst in the CST team is to continually review the customers’ defined scope for vulnerabilities, identify additional targets that should be included in the scope, and report these to the client in a timely, accurate, and comprehensive manner. The Security Analyst is also responsible for pre-engagement activities including scoping, statements of work, working with customers to determine their testing requirements and restrictions, and on boarding customers into the service.

Essential duties & responsibilities

The Continuous Security Testing service is a consultant led vulnerability identification and verification service which makes use of automated vulnerability scanning along with significant manual testing against a broad scope in a continuing engagement. The purpose of the service is to continually monitor a customer’s external attack surface for new vulnerabilities, changes in the scope of the attack surface, and proactively inform customers of discovered issues along with recommended remediation; with the overall aim of reducing the lifetime of each vulnerability. Manual testing includes identification of issues which automation alone could not identify, exploitation of all issues, often chaining multiple findings together in order to determine the true impact of vulnerabilities for the customer.

Pre-engagement activities including scoping of assessments and statements of work, and determining customer requirements and restrictions.
On boarding customers into the service including configuration of continual scanning, and liaising with customer to resolve issues which may reduce the effectiveness of scanning.
Monitoring of the customers’ external perimeter for changes, and proactive discovery of new targets to include within the customer’s scope.
Manual identification and exploitation of vulnerabilities.
Manual verification and exploitation of scanner findings.
Detailed analysis of issues identified and exposure for the customer including proof of concept, reproduction steps, and recommended remediation.
Communication of findings to the customer in a detailed, accurate and manageable manner both orally and through written vulnerability/scope notifications and periodic summaries.
Assisting in the continual development of the team and service through research and development activities. This includes the development of in-house tools the implementation of tools released to the community, and design and documentation of new and existing internal systems and processes.
Continual professional development to maintain and develop knowledge and technical competencies.
Maintain professional technical qualifications to demonstrate competency to our clients.
Contributing to the writing and publishing of whitepapers and advisories.
Undertaking projects and support tasks as appropriate to the role.

About You

Position specifications


Excellent written and spoken English including presentation, structure, spelling, and grammar. Along with experience conveying technical information in an accessible manner.
Core computing skills including but not limited to:
Networking fundamentals – understanding of OSI Model, TCP/IP, HTTP, DNS, SMB, SMTP and relevant tools.
Microsoft Windows and Office proficiency along with proficiency in one or more Linux distributions.
Strong knowledge of web application technologies and security assessment including but not limited to:
REST APIs, SOAP APIs, XML and JSON formats.
Vulnerability identification and exploitation (not limited to OWASP Top 10).
Experience with common assessment tools such as MITM proxies (e.g. Burp Suite Pro) and SQLMap.
Good knowledge of internal and external infrastructure technologies and security assessment including but not limited to:
Identification and exploitation of misconfigurations or known vulnerabilities in common enterprise infrastructure and services (Windows Domains, Linux servers, virtualisation, databases, switches/routers, etc).
Windows and Linux Sandbox/Desktop Breakout.
Knowledge of a scripting language such as Python (preferred), Ruby, PowerShell, or Bash, for the development of new, or editing existing, tools.
Evidence of rapidly and confidently gaining knowledge of, and applying knowledge of, emerging technologies, vulnerabilities, and penetration testing tools and techniques.
Excellent time management including setting priorities and goals to complete assigned and arising tasks.


Knowledge of Open Source Intelligence gathering techniques. Including but not limited to use of Google dorks, DNS, domain registration, certificate transparency, and other public sources of information.
Experience with live bug bounties, particularly where automation has been implemented.
Knowledge of security considerations in the cloud (AWS, Azure, and GCP), particularly identifying vulnerable configurations through management and API access along with exploitation of web/infrastructure vulnerabilities specific to cloud environments.
Knowledge of mobile application vulnerability identification and exploitation including but not limited to Android and iOS app structure, decompliation, code signing, and traffic interception.

Desirable Certifications

CRT – CREST Registered Penetration Tester (or above).
OSCP – Offensive Security Certified Professional.
GWAPT – GIAC Web Application Penetration Tester.
A related Bachelor’s degree.
About Us
Founded in 1996, Claranet has evolved into a multi-disciplinary technology services provider with global reach. The company has annualised revenues of circa £400 million, over 6,500 customers, and more than 2,500 employees in nine countries. In the UK we have over 500 staff working in London, Gloucester, Warrington, Bristol, and Leeds, or as homeworkers.

We’re working on building an ever-improving company based on openness, diversity, collaboration, and empathy as our core values, a company that aims to be inclusive for the diverse group of people we get to work with, and where everyone supports each other and celebrates successes together. We want our people to feel engaged, comfortable, and healthy—and to know that they can belong here, no matter their story or background. If this resonates with you, then come and join us.


Sec-1 is a Claranet Group Company, established since 2001 and now providing professional standard Information Security Solutions to over 600 customers across Public and Private sectors. Sec-1 Ltd’s Continuous Security Testing (CST) team is composed of highly skilled penetration testers with a real passion for improving system security posture by demonstrating how they can be broken. Team members work on everything from customer projects to community work to gaining credit for published advisories. Our team needs to grow, we are producing amazing results that make a real difference, and if you can help make this difference you should come join us too.

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