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About Me

Background

I'm a final-year BSc Criminology and Cybercrime student at the University of Portsmouth, expected to graduate in summer 2026 with First-class honours (current average: 78% in second year, 69% in first year). My work sits at the intersection of traditional criminology and cutting-edge cybersecurity.

Contact: calumjelrick@protonmail.com | +44(0)7475 346263
Location: Portsmouth / Leigh-on-Sea, UK
Nationality: South African and British
Languages: English (native), Afrikaans (intermediate)

Technical Expertise

Offensive Security

  • Penetration testing and vulnerability assessments
  • Web application security testing
  • Network infrastructure exploitation
  • Active Directory attack paths and lateral movement
  • Phishing campaigns and red-team engagements

Tools & Technologies

  • Security Tools: Qualys VMDR, Tenable Suite, BurpSuite Enterprise, Nmap, Metasploit
  • Programming: Python, C, PowerShell, Bash
  • Platforms: Linux, Windows, Active Directory, Azure/Entra ID
  • Methodologies: OWASP, PTES, MITRE ATT&CK

Specialisations

  • Microsoft Entra Connect security research
  • WordPress vulnerability analysis
  • Identity and access management exploitation
  • Social engineering and OSINT
  • Digital forensics and forensic linguistics

Professional Experience

Cybersecurity Consultant - Rootshell Security Ltd (Feb 2022 - Sep 2023) - Led monthly vulnerability management scans for 15+ global organisations using Qualys VMDR, Tenable Suite, and BurpSuite Enterprise - Conducted comprehensive web application security audits, phishing campaigns, and red-team engagements - Performed ad-hoc web application pentests, leveraging extensive bug bounty community experience - Discovered CVE-2022-1386, a critical zero-day WordPress vulnerability earning NIST recognition - Achieved 93% client retention rate while successfully onboarding 5 new clients

Security Research Intern - Reversec UK Ltd (Jun 2025 - Aug 2025) - Trained with senior cybersecurity consultants across network, web, cloud, mobile and AI security - Conducted vulnerability research project under guidance from senior testing team - Researched Microsoft Entra Connect Sync exploitation techniques - Developed proof-of-concept attacks for MSOL credential extraction - Created modern tooling replacing deprecated AADInternals functionality

IT Help Advisor - University of Portsmouth (Sep 2024 - Current) - Provide comprehensive technical support seven days a week at university library - Handle diverse IT issues including network connectivity, email configurations, and printing services - Offer guidance on virus removal and liaise with local repair services for discounted hardware repairs

Apple Repair Technician - Fixio Ltd (Oct 2020 - Sep 2021) - Hardware diagnostics and repair services

Education

BSc (Hons) Criminology and Cybercrime - University of Portsmouth (2023-2026) - First-year: 2:1 (69% average) - Second-year: First-class (78% average) - Third-year: In progress - Dissertation: "Danger From Zero Metres Away: Public Perceptions of Safety, Risk and Misuse of Live-location-based Dating Applications" - Focus areas: IoT security, social engineering, cybercrime policy, digital forensics

Certified Ethical Hacker (CEH) - EC-Council (2021-2025) - Modules: Ethical hacking concepts, cyber kill chain, information security overview, security controls, laws and regulations

GED Diploma and SATs - Light Learning Centre (2018-2019) - GPA: 3.3 - GED (GCSE equivalent): Mathematics, English, Social Studies, Science - SAT & Subject Tests (A-level equivalent): English (73%), Mathematics (83%), Molecular Biology (73%), Advanced Mathematics (83%)

Recognition

  • CVE-2022-1386: NIST-recognised critical vulnerability discovery
  • HackTheBox: Achieved Hacker rank across multiple domains
  • Academic Excellence: First-class performance in second and third year technical modules
  • Client Success: 93% retention rate at Rootshell Security

Research Interests

My research bridges theoretical criminology and practical cybersecurity:

  • Temporal asymmetries between criminal adaptation and institutional responses
  • Geolocation privacy in dating applications
  • Vulnerability in IoT ecosystems
  • Social engineering attack vectors
  • Identity security and cloud authentication mechanisms
  • Forensic linguistic authorship analysis

Career Goals

I'm pursuing roles in: - Offensive security and penetration testing - Threat intelligence and vulnerability research - Government and defence sector cybersecurity (SC/DV clearance eligible) - Security research and development

Graduating summer 2026 and actively seeking graduate opportunities.