Penetration tester with a First Class Honours degree in Computer Science with Cybersecurity. Working toward CREST CPSA/CRT certification. Driven by genuine curiosity — and always looking to go deeper.
About
I'm a penetration tester based in the UK, focused on network security, red team operations and web application testing. I graduated with a First Class Honours degree in Computer Science with Cybersecurity, and I'm actively working toward CREST CPSA and CRT — the industry-recognised benchmark for professional penetration testers in the UK.
What drives me is genuine curiosity about how systems work — and how they break. I don't just want to know that a vulnerability exists; I want to understand it from the ground up. That same mindset has led me to build custom hardware for security work, develop tooling from scratch, and explore attack paths that go well beyond off-the-shelf techniques.
I'm at an early stage of my career and I own that — but I bring real hands-on skills, a strong academic foundation, and a genuine commitment to keep learning. I'm looking to grow within a team where depth and craftsmanship matter.
BSc Computer Science
with Cybersecurity
First Class Honours
CREST CPSA / CRT
Penetration Testing Certification
In progress — active study
Based in the UK
Open to opportunities
On-site, hybrid or remote
Expertise
Internal and external network assessments — identifying misconfigurations, weak authentication, lateral movement paths and privilege escalation opportunities across infrastructure.
Simulating advanced threat actors to test detection and response. Combining technical exploitation with physical access techniques and purpose-built hardware for realistic adversary simulation.
In-depth web application assessments covering OWASP Top 10 and beyond — from injection and authentication flaws to business logic vulnerabilities and security control weaknesses.
Capabilities
I design and build custom hardware for offensive security engagements — from portable remote-access platforms with mobile data, battery power and high-gain antenna capability, to purpose-built HID attack devices concealed within standard peripherals for covert payload delivery scenarios.
Hands-on experience with standard offensive security tooling used across professional engagements.
Building bespoke tools for specific engagement needs — including original research into security control detection and bypass techniques.
Actively building skills through lab environments, independent research and CREST exam preparation. Always looking to go deeper on both technique and fundamentals.
Contact
Whether you're looking for a penetration tester, want to discuss a security opportunity, or just have a question — I'd be glad to hear from you.
thomas@beilby.net
Mail policy
Private domain · No bulk mail · No marketing