Kosiso Umeaka

Passionate and experienced security engineer with a strong focus on cybersecurity, governance, risk management, and secure architecture. I thrive at deep technical work and business impact, from hardening enterprise envs and implementing compliance frameworks to building security policies, automate processes, and AI-driven solutions that enhance operational efficiency and strengthen the organisation.

Senior Security Engineer - Coscharis Technologies - Victoria Island, Lagos State

(2024-01)

• Lead design and implementation of enterprise cybersecurity architectures, covering SOC, incident response, Email Security, Network Security (Micro segmentation), SOAR automation, EDR/XDR deployments, and UEBA integration.
• Conduct gap analysis to eval existing sec posture and recommend, targeted improvements.
• Monitor security events across systems and networks, analysing incidents to identify expected and anomalous outcomes.
• Analyse security threats, vulnerabilities, and attack patterns, implementing proactive security measures and protocols.
• Implement and enforce governance and compliance controls aligned with NDPR, GDPR, ISO 27001, ISO 9001 NIST CSF, PCI DSS, and SWIFT CSCF.
• Collaborate closely with IT teams to enhance overall security posture through remediation planning and architecture optimisation.
• Conduct regular security audits, assessments, and risk evaluations to ensure continuous improvement.
• Architect, deploy, and optimise Microsoft 365 Security, Azure security controls, Microsoft Sentinel, Defender Suite, and Purview.
• Maintain SIEM proficiency by correlating logs from tools like Elastic SIEM, Splunk, Lima Charlie, Qradar, Sumo Logic, and Microsoft Sentinel.
• Develop and communicate security policies, procedures, and operational guidelines.
• Develop, test, and refine prompts to assess AI behaviour boundaries and evaluate AI-generated outputs for security implications
• Provide timely responses to security incidents and breaches, ensuring thorough investigation and containment
• Evaluated, tested, and implemented AI-powered productivity, policies and security solutions, including prompt engineering, AI governance controls, workflow automation, and responsible AI usage guidelines.
• Developed automated business and security workflows using GitHub Actions, Microsoft ecosystem tools, and API integrations to improve operational efficiency and reduce manual effort.

Cyber Security Analyst - Kosinko Technologies Global Limited - Victoria Island

(2022-01 - 2024-01)

• Consulted for multiple organisations in-house, performing vulnerability testing, incident response, and recommending security improvements.
• Built and maintained a personal cybersecurity lab for real-world simulations, vulnerability testing, and network security analysis.
• Expanded practical skills across threat detection, network security, endpoint defence, and security assessment workflows.
• Used hands-on analysis to identify weaknesses and strengthen sec posture, across envs.

Bachelor's Degree - Computer Science - Nnamdi Azikiwe University (2018-01 - 2022-12)