Who is Sebastine ?

Who is Sebastine ?

Experienced Cybersecurity Engineer and Network Engineer with DevOps and System Administration experience while working for a software development company and collaborating on several projects. Expertise in business continuity planning, disaster recovery planing and implementation as well as monitoring and analyzing data, proactively preventing cyber-attacks, and quickly identifying and remedying breaches.

Skilled in managing SIEM, conducting vulnerability assessments, and carrying out threat hunting activities. Proficient in building and maintaining tooling and infrastructure for detection and response capabilities, and experienced in performing security assurance activities. Equipped with a good understanding of AWS/Cloud/Server technologies and experience with scripting languages, and dedicated to ensuring the security of the organization and customers.

I use SWOT analysis to identify an organization’s network and infrastructure vulnerabilities, followed by a detailed impact analysis to develop effective strategies that address weaknesses and threats.

My skill set includes technical writing, product documentation, and technical to non-technical illustration. I am proficient in vulnerability assessment tools like OWASP ZAP, Lynis, Splunk, Wazuh SIEM, ELK Stack, and penetration testing tools such as Nikto, Nmap, Shodan, Burpsuite, Wireshark, and Metasploit. I am also experienced in cloud platforms like AWS, Azure, and Google Workspace, virtualization technologies like Hyper-V, KVM, Proxmox, and VMware EsXi, and networking tools like PRTG, Nessus, and firewalls.

As a freelance security engineer, I have performed successful vulnerability assessments and provided remediation recommendations. I have also designed and managed AWS Cloud Security using tools like AWS Identity and Access Management and set up private subnets for critical infrastructure.

In my previous role as an IT infrastructure security engineer at Hardcore Biometric Systems, I performed system auditing and hardening of Linux and Windows servers, monitored and enforced compliance with information security policies, and kept myself up-to-date with emerging threats and vulnerabilities. I also designed and managed the SIEM system and led the configuration and management of a wide variety of other security products and appliances.

My experience as an IT support specialist at Nigerian Brewery has honed my skills in technical support and troubleshooting.

Overall, my comprehensive knowledge of security and IT infrastructure, along with my practical experience in designing and implementing effective security solutions, make me an asset to any organization.


Highly Available SIEM

Multi-Site Hybrid SIEM Tool For Checking Servers Compliance with standards like NIST, PCI DSS, ISO 27001 & 27002, HIPAA, GDPR and more.

Data Center Power Design

Data Center Off Grid Power Design with 2 redundancy Implementation

Highly Available Multi-Site PRTG

Monitoring tool for server resources, devices uptime, and network equipment logs

Multi-Site VoIP

Multi-site VoIP with Minimal Infrastructure, Highly Available and Scalable

Enterprise E-Mail Server

Clustered Enterprise Mail Server; Highly-Available, Highly-scalable

Vsphere & VM-Ware Admin

Data Center Virtualization and Cloud Engineering

World Best Practice

Before Implementing a solution i must consider world best practices.


I ensure all steps are properly documented.


From the design to demo, everything is security focused.