Principal Cyber Security Test Engineer

We are looking for an experienced principal application security engineer who will champion a shift-left security philosophy by integrating automated security analysis into CI/CD pipelines SAST scanning, GitHub Actions, and SCA working closely with development teams to help guide threat modelling session and to identify, remediate, and prevent vulnerabilities while ensuring compliance with various security frameworks such as NIST and ISO27001.

What You Will Do:

As a principal application security engineer you will be responsible for embedding security into the software development lifecycle (SDLC) across the organisations .NET, Java, and Node.js technology stacks. This role champions a shift-left security philosophy by integrating automated security analysis into CI/CD pipelines, SAST, GitHub Actions, and SCA. As a principal engineer you will work closely with development teams to help guide threat modelling session and to identify, remediate, and prevent vulnerabilities while ensuring compliance with open-source licensing obligations.

What You Will Have:

• 5+ years of experience in application security, software engineering, or DevSecOps.
• Proven hands-on experience securing applications built with .NET, Java, and Node.js.
• Demonstrable expertise administering SAST scanning at enterprise scale (multi-project, multi-language).
• Experience implementing and managing SCA tooling, ideally Harness, across large codebases.
• Strong working knowledge of GitHub Actions CI/CD pipelines and GitHub Advanced Security features.
• Experience configuring and using IAST and RASP technologies
• Deep understanding of common vulnerability classes (injection, broken access control, cryptographic failures, SSRF, etc.).
• Ability to execute on web and desktop penetration tests
• Demonstrable expertise securing the embedding and implementation of AI within applications

What We Do For You

• Wellbeing focused – Our people are our greatest assets, and ensuring everyone feels their best self to come to work is integral.
• Annual Leave – 20 days of annual leave, plus public holidays
• Employee Assistance Programme – Free advice, support, and confidential counselling available 24/7.
• Personal Growth - Regardless of where you are at in your career, were committed to enabling your growth personally and professionally
• Development Programmes – From Future Managers to Leadership Training, our development programmes help you get where you need to go
• Online Learning Platform: SkillsHub! - Learning at your fingertips, anytime from anywhere. You can access our online library with relevant content for your career growth.
• Life Insurance - 3x annual salary
• Personal Accident Insurance - providing cover in the event of serious injury/illness.
• Performance Bonus – Our Group-wide bonus scheme enables you to reap the rewards of your success

Who We Are

At OneAdvanced, we are at the forefront of delivering sector-focused technology solutions that simplify complexity, drive meaningful progress, and help build a fairer, more inclusive society.

Were much more than a software company. We deliver SaaS workflow applications and IT services that power organisations across Education, Government, Healthcare, Legal, Manufacturing, Housing, Retail, and more.

OneAdvanced is one of the UKs largest business software and services companies. Based in Birmingham (The Mailbox), operating across the UK, Ireland, India, and Australia.

Our secure, scalable platform, including OneAdvanced AI, our private AI service for UK organisations, powers connectivity and innovation across critical sectors. Alongside our software are our IT services, including hosting, managed services, and application modernisation.

We strive to create an inclusive workplace that drives innovation and collaboration, championing diverse perspectives and ideas. Our Environmental, Social and Governance (ESG) strategy is embedded in everything we do, guiding us to create meaningful impact for our people, our customers and the planet.

Join us and become part of a team thats powering the world of work and making a real difference.

Learn more at www.oneadvanced.com