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GarethMSheldon/readme.md

Gareth Sheldon

Turning fragmented threat data into resilient, auditable security systems.

Lead Technical Engineer @ Advania UK · Cape Town, South Africa

LinkedIn Portfolio HTB


At a Glance

5 yrs 30% 35% Top 4.85%
Experience Breach reduction Malware incidents cut HTB global rank

Hack The Box

Script Kiddie · Rank #1 / 6 in South Africa · Top 4.85% globally · 13 solves

Challenge Type Result Date
Conversor Machine User + Root Nov 2025
RomCom Sherlock Full Nov 2025
Expressway Machine User + Root Nov 2025
Brutus Sherlock Full Dec 2024
UnderPass · Cap Machines User + Root Dec 2024
8× Challenges Flags Captured Nov 2025

Featured Projects

PowerShell toolkit automating security audits for IoT/OT environments. 100+ controls, 0–100 risk score, multi-framework compliance.

PowerShell ISO 27001 IEC 62443 PCI-DSS HIPAA GDPR MDE Defender for IoT


GUI PowerShell suite for MSP technicians — 60+ one-click diagnostic and repair functions with real-time colour-coded logging.

PowerShell Windows Forms Active Directory M365


🎯 CVE Detection Engineering Initiative

KQL queries, YARA rules, and CVE-to-MITRE ATT&CK mapping for emerging CVEs. Published detectors for CVE-2025-55182 and CVE-2025-60787.

KQL YARA Microsoft Sentinel MITRE ATT&CK Threat Hunting


🕵️ SOC Threat Intelligence Pipeline

Honeypot + MISP + Microsoft Sentinel. Python Azure Function App ingesting STIX/TAXII feeds into Log Analytics with real-time KQL IOC correlation.

Python KQL MISP STIX/TAXII Azure Functions Honeypot


📊 Security Observability Dashboard

Grafana platform integrating SentinelOne EDR, Sophos Firewall, and Datto RMM via Python. Unified IPS/SD-WAN and endpoint threat visualisation.

Grafana Loki PromQL Python SentinelOne Sophos


☁️ Enterprise Azure Monitor

Production-ready Azure observability: Log Analytics, AMA, DCRs, App Insights, Network Watcher, NSG Diagnostics, automated Action Groups.

Azure Monitor AMA DCR KQL App Insights


Current Role

Lead Technical Engineer & Senior Service Desk Engineer Advania UK (Mirus IT Solutions) · Cape Town · July 2025 – Present

  • Top escalation point for complex FinTech security incidents — EDR telemetry, log analysis, RCA
  • Engineers KQL detection rules and threat hunts across hybrid environments with Defender for Cloud Apps
  • Zero Trust architecture with Conditional Access and SAML SSO, eliminating lateral movement vectors
  • Automated SOC workflows via Power Automate and Graph API integrating Sentinel, Jira, and Salesforce
  • ISO 27001 and Cyber Essentials compliance — 99.999% SLA adherence
Previous experience

Senior Technical & Cybersecurity Engineer — Gavotech IT Solutions · May 2024 – Jun 2025

  • Penetration tests and vulnerability assessments across web apps, networks, and infrastructure
  • End-to-end incident response with custom playbooks; deep forensic investigations (Autopsy, FTK, SANS SIFT)
  • Sophos XG and FortiGate firewalls — breaches down 30%; Mimecast blocking 1,000+ malicious emails/month
  • On-premises CI/CD pipelines with automated vulnerability gates and Docker image hardening

Technical Engineer — Gavotech IT Solutions · May 2022 – May 2024

  • Managed 1,000+ endpoints across Windows, macOS, and Linux; 20% efficiency improvement
  • SentinelOne EDR with behavioural AI — malware down 35%, response times down 30%
  • Multi-regional VPN (IPsec, SSL VPN, L2TP, PPTP); QoS improving throughput by 20%

Core Skills

Domain Tools & Technologies
Penetration Testing Nmap · Burp Suite · OWASP ZAP · Nikto · SQLmap · Metasploit · Hydra · ffuf
SIEM & SOC Microsoft Sentinel · Wazuh · KQL · MISP · STIX/TAXII · TheHive · Shuffle
Cloud Security Azure Monitor · Log Analytics · Entra ID · Conditional Access · AWS IAM · EC2
Scripting PowerShell · Python · Bash · Power Automate · Graph API
Vuln Management Nessus · Qualys · Greenbone GVM · Tenable · YARA · CVE triage
Digital Forensics Autopsy · FTK · SANS SIFT · Disk Imaging · IOC Extraction
Network Security Sophos XG · FortiGate · Cisco · Wireshark · tcpdump · SD-WAN · IPsec
GRC & Compliance ISO 27001 (Lead Auditor) · Cyber Essentials · PCI-DSS · GDPR · NIST CSF
Containers Docker · Kubernetes · Cilium · Terraform · Ansible · CI/CD

Certifications

View all certifications

GRC & Compliance

  • ISO/IEC 27001:2022 Lead Auditor — Mastermind Assurance (Apr 2025)
  • IT Audit & Risk Management Specialist — Mastermind Assurance (Apr 2025)

Microsoft & Cloud

  • Applied Skills: Deploy & Configure Azure Monitor — Microsoft (Dec 2025)
  • Applied Skills: Administer Active Directory DS — Microsoft (May 2025)
  • AWS Cloud Technology Consultant Specialization — AWS (Dec 2024)

Defensive Security

  • Blue Team Junior Analyst (BTJA) — Security Blue Team (Mar 2024)
  • Tenable Vulnerability Management Specialist — Tenable (Dec 2024)
  • MITRE ATT&CK Operationalizing Foundations — AttackIQ (Sep 2024)
  • Sophos Firewall Certified Engineer v20.0 — Sophos (Nov 2024)
  • N-able EDR / SentinelOne Specialist — SentinelOne (Nov 2022)
  • Kaseya Certified Technician — Datto Cybersecurity (Oct 2024)

Networking & Fortinet

  • Fortinet Certified Associate — Cybersecurity (exp. Feb 2028)
  • Fortinet FortiGate 7.6 Operator — Fortinet (Feb 2026)
  • Aruba Accredited SD-WAN Expert — HPE (exp. Feb 2028)
  • Aruba Accredited SD-WAN Professional — HPE (exp. May 2027)
  • NSE 1, 2 & 3 Network Security Associate — Fortinet (Jan 2023)

Cisco & Other

  • Junior Cybersecurity Analyst Career Path — Cisco (Jun 2023)
  • Certified Calico Operator Level 1 (Kubernetes) — Tigera (May 2024)
  • Discovery: Platform Engineer — Isovalent (Feb 2026)
  • API Security Fundamentals — APIsec University (May 2024)
  • Scientific Computing with Python — freeCodeCamp (2025)

GitHub Stats

Gareth's GitHub Stats Top Languages Streak


"Security is not a product, but a process. It's about building resilient systems that fail securely and recover gracefully."

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  1. TheMSPToolkit TheMSPToolkit Public

    Professional PowerShell GUI toolkit for MSP technicians. One-click diagnostics and repairs for the most common Windows IT support tickets. Admin elevation required.

    PowerShell 1

  2. Digital-Portfolio Digital-Portfolio Public

    Lead Technical Engineer and Cybersecurity Specialist portfolio featuring automated threat hunting scripts, cloud security architecture, and infrastructure automation for FinTech environments. Highl…

    HTML

  3. IoT-Security-Audit-Tool IoT-Security-Audit-Tool Public

    A comprehensive PowerShell-based security assessment toolkit for IoT and OT devices. Choose the version that matches your organization's needs - from essential security controls to enterprise-grade…

    PowerShell 1

  4. Network-IDS-Python Network-IDS-Python Public

    Lightweight real-time Network Intrusion Detection System with a Python GUI that monitors active connections and detects port scans, brute force attempts, and suspicious activity on Windows and Linux.

    Python