Chigozie Ejeofobiri, Developer in Birmingham, United Kingdom
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Chigozie Ejeofobiri

Verified Expert  in Engineering

Security Architect and Developer

Birmingham, United Kingdom
Toptal Member Since
November 18, 2022

Chigozie is a network security consultant with over 12 years of experience working with organizations to use technology to support and drive business goals. He has extensive knowledge of network perimeter security, defense-in-depth architectures, zero-trust designs, security operations, system security risk analysis and assessment, and project management. Chigozie is also highly experienced in perimeter security implementation of on-premise and cloud firewalls.


Freelance Clients
Fortinet Firewall Configuration, FortiGate, Palo Alto Networks, Check Point...
InfoGuardian Solutions
Amazon Web Services (AWS), Azure, FortiGate, Check Point, ASA Firewalls...
NSC Global
CCIE, Cisco Meraki, Firewalls, Check Point, Fortinet Firewall Configuration...




Preferred Environment

ASA Firewalls, Palo Alto Networks, Check Point, Amazon Web Services (AWS), Azure, Zero Trust, Threat Analytics, IDS/IPS, Fortinet Firewall Configuration, Cisco

The most amazing...

...project I've done involved migrating cross-vendor firewalls such as Fortinet, Cisco, Check Point, and Palo Alto Networks on-premise and to the cloud.

Work Experience

Senior Technical Consultant (Network Security)

2022 - PRESENT
Freelance Clients
  • Created technical solution design, planning, implementations, support, and upgrades across multi-vendor next-generation firewalls from Fortinet, Check Point, Palo Alto, and Cisco, from simple structures to datacenter firewalls for multiple clients.
  • Redesigned perimeter security solutions from traditional models to involve proper segmentation, zero-trust, and next-generation firewall features—threat prevention, URL filtering, and content inspection for multiple clients.
  • Remodeled security solutions that required cross-vendor firewall migrations between vendor devices based on the client's business requirements and preferences; ensured migration activity was adequately planned, securing successful migrations.
  • Worked with clients to set up a hybrid cloud network environment involving on-premise and cloud services.
  • Created configuration scripts for repeated daily tasks and activities. Performed backups and upgrades of software images.
Technologies: Fortinet Firewall Configuration, FortiGate, Palo Alto Networks, Check Point, ASA, Cisco, Firewalls, Zero Trust, DMZ Networks, Threat Analytics, URL Filtering, Content, Network Access Control, Network Security, Network Engineering, Vulnerability Management, Security

Senior Security Engineer

2021 - 2022
InfoGuardian Solutions
  • Involved in multiple technical solution planning, design, implementation, support, and upgrades of network security solutions for different clients based on their business requirements.
  • Assisted in business-as-usual third-level troubleshooting supports for different system issues, collaborating with internal customers and outside vendors to resolve complex problems and restore services within agreed SLAs (service level agreements).
  • Collaborated with cross-functional teams, project teams, and internal and external partners to ensure technology solutions were designed, implemented, and maintained per security best practices and organizational and regulatory requirements.
  • Performed audits and assessments on client's firewalls configurations and provided recommendations to improve the security posture of the firewalls.
Technologies: Amazon Web Services (AWS), Azure, FortiGate, Check Point, ASA Firewalls, Amazon Firewall, Palo Alto Networks, Security Audits, Zero Trust, Network Segmentation, Vulnerability Management, Security, Auditing, Network Security

Network Security Architect

2018 - 2021
NSC Global
  • Engaged in day-to-day technical solution planning, design, implementations, and support and upgrades of on-premise and cloud network security solutions for multi-vendor firewalls, network devices, servers, security, and the cloud.
  • Designed and maintained network security policies, performed audits on the client's existing firewalls, provided remediation configurations, and implemented device hardening on network devices.
  • Wrote technical proposals for new clients' solutions and demonstrated products' proof of concept involving perimeter firewall solutions.
  • Provided technical leadership and mentorship to junior security engineers.
Technologies: CCIE, Cisco Meraki, Firewalls, Check Point, Fortinet Firewall Configuration, Sophos Firewall, Azure, Amazon Web Services (AWS), ASA Firewalls, Palo Alto Networks, DMZ Networks, Azure Virtual Networks, Risk Management, Unified Threat Management (UTM), Threat Modeling, Python 3

Network Security Architect

2018 - 2018
Infoprive Services
  • Provided advisory knowledge on network security architecture and designs using approved validated design standards to create secure technical solutions that ensured organizations met regulatory compliance and industry standards.
  • Engaged in enterprise system security design, engineering, and systems integration for various customer environments.
  • Configured and managed security devices: network firewalls, intrusion detection systems (IDS) and intrusion prevention systems (IPS) devices, and security information and event management (SIEM) solutions.
Technologies: ASA Firewalls, PCI DSS, Fortinet Firewall Configuration, Auditing, System Administration

Network Engineer

2016 - 2018
  • Aided in implementing, managing, and maintaining security technologies—firewalls, VPNs, data loss prevention (DLP), SEIM, antivirus—and managed services.
  • Supported information security architects in designing and managing secure network infrastructure.
  • Assisted in proactively conducting periodic checks and quarterly maintenance, network devices patching, software upgrades, etc.
Technologies: IP Networks, IPv4, Multiprotocol Label Switching (MPLS), Cisco Switches, Cisco Routers, Border Gateway Protocol (BGP), Open Shortest Path First (OSPF), System Administration

Network Engineer

2012 - 2016
BETA Computer Services
  • Worked on security solution designs to securely provision and apply technical controls by configuring security policies, access control, firewalls, remote access VPNs, site-to-site VPN, URL and content filtering, etc.
  • Installed, optimized, and supported network security infrastructure to meet data protection and system resiliency requirements while preserving end user experience.
  • Assisted network operations teams with developing secure system baseline configurations.
Technologies: Networking, IP Networks, DMZ Networks, Cisco Switches, Cisco Routers, System Administration

Data Center Migration

Consulted on a client's data center consolidation and migration.

As a senior security consultant, I was involved in the initial discovery of the existing data centers, creating high-level design documents, the bill of materials, the low-level design, and the data center migration activity.
2021 - 2023

Master's Degree in Information Security and Digital Forensics

University of East London - London, England

2003 - 2007

Bachelor's Degree in Electrical Electronic Engineering

Madonna University, Nigeria - Nigeria


Prisma Access SASE Security: Design and Operation

Palo Alto and Red Education


AWS Advanced Network Specialty



Azure Network Engineer Associate



NSE 7 Network Security Architect



Check Point Certified Security Expert

Check Point Software Technologies


Azure Security Engineer Associate


APRIL 2021 - APRIL 2024

AWS Certified Security – Specialty

Amazon Web Services


Certified Information Systems Security Professional



Cisco Certified Internetwork Expert - CCIE Security



Cisco Certified Network Professional



Cisco Certified Network Associate



Cisco Meraki, Amazon Firewall, Sophos Firewall, AWS ELB, AWS IAM

Industry Expertise

Network Security, Cybersecurity


Windows, Amazon Web Services (AWS), Azure, Azure IaaS, AWS NLB


Python 3


Azure Active Directory


CCIE, DMZ Networks, Firewalls, Fortinet Firewall Configuration, Unified Threat Management (UTM), Security, Network Access Control, Infrastructure Security, Network Architecture, Azure Virtual Networks, Palo Alto Networks, Check Point, CCNP Security, Risk Management, SecOps, Cloud Security, Network Engineering, Vulnerability Management, System Administration, Secure Access Service Edge (SASE), ASA Firewalls, Networking, IP Networks, FortiGate, Cloud, Cisco, CISSP, Threat Modeling, Threat Analytics, URL Filtering, Content, Networks, IPv4, Cisco Routers, Cisco Switches, Engineering, Security Audits, Zero Trust, Network Segmentation, PCI DSS, Auditing, Multiprotocol Label Switching (MPLS), Border Gateway Protocol (BGP), Open Shortest Path First (OSPF), Information Security, IDS/IPS, ASA, Cloud Infrastructure, AWS VPN, Cloud Computing, Fortinet

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