Abdul B. Sesay
Chief ITN Security Officer (CISO) @ Orange SL
About
As the Chief IT & Network Security Officer (CISO) at Orange Sierra Leone, I lead the strategic direction and implementation of cybersecurity across one of the country’s leading mobile telecommunications providers. I am responsible for protecting critical infrastructure, managing enterprise-wide risks, and ensuring regulatory compliance in a fast-paced, technology-driven environment. With a career spanning hands-on technical roles to executive leadership, I bring a unique combination of deep technical expertise, practical problem-solving skills, and strategic vision. I have extensive experience in cybersecurity leadership, vulnerability research, incident response, IT governance, and ICT infrastructure management. Key strengths include: ●Cybersecurity Leadership: Developing and executing robust security strategies, incident response plans, and risk management frameworks. ●Telecommunications Security Expertise: Securing mobile networks, applications, and sensitive customer data against evolving threats. ●ICT Operations & Optimization: Managing networks, hardware, software, and systems to ensure secure, reliable, and efficient operations. ●Building Security Culture: Fostering awareness and proactive security practices across teams to enhance organizational resilience. I am passionate about safeguarding digital infrastructure, enabling secure business operations, and driving innovation in cybersecurity within the telecom sector.
Sierra Leone
Freetown
Telecommunications
Threat & Vulnerability Management, Risk Management, IT Audit, IT Security Assessments, Access Management, Governance, Risk Management, and Compliance (GRC), Privilege Access Management (PAM), Identity and Access Management (IAM), Vulnerability Management, Security Patch Management, Cyber Threat Intelligence (CTI), Design Thinking, Analytical Skills, Network Infrastructure, Computer Maintenance, Cisco Networking, Cisco Routers, Hardware, Copper Cabling, Cat5e
Experience
Chief ITN Security Officer (CISO)
Orange SL
Freetown, Western Area, Sierra Leone
●Defines and executes comprehensive IT and network security strategy for enterprise-level systems. ●Oversees risk assessment, compliance, and incident response frameworks, strengthening operational continuity. ●Protectes critical telecommunications infrastructure and sensitive data against evolving cyber threats. ●Guides cross-functional teams to integrate security practices into business processes, boosting efficiency.
Acting Chief Information Security Officer (CISO)
Orange SL
Freetown, Western Area, Sierra Leone
●Directed interim IT & network security operations, safeguarding critical assets across the organization. ●Led risk management, incident response, and governance strategies, reducing potential threats. ●Aligned security initiatives with business objectives, enhancing organizational resilience. ●Cultivated a proactive cybersecurity culture, improving team awareness and compliance.
Information Systems & Network Security Officer
Orange SL
Freetown, Western Area, Sierra Leone
●Implemented and enforced security policies across critical information systems. ●Conducted risk assessments, compliance audits, and access control management. ●Ensured secure operations and rapid incident response to minimize system exposure. ●Protected sensitive data and supported regulatory compliance requirements.
Cybersecurity & Vulnerability Researcher
Freetown, Sierra Leone
●Discovers and mitigates system, network, and application vulnerabilities to prevent attacks. ●Conductes threat research, vulnerability assessments, and exploit analysis to improve defenses. ●Deliveres actionable insights and recommendations to enhance organizational security posture. ●Supportes responsible disclosure initiatives, strengthening industry and organizational trust.
Principal ICT Technician
IPAM - University of Sierra Leone
Freetown, Sierra Leone
●Managed and optimized ICT infrastructure, including networks, hardware, and software. ●Troubleshot complex technical issues, implemented system upgrades, and maintained operational continuity. ●Provided technical support to improve end-user productivity and minimize downtime. ●Assisted in aligning IT operations with organizational goals and security standards.
Computer Laboratory/Support Technician
IPAM - University of Sierra Leone
Freetown, Sierra Leone, West Africa.
●Maintained computer lab environments to ensure optimal functionality and accessibility. ●Troubleshot hardware, software, and network issues efficiently for students and staff. ●Conducted system updates and maintained secure, user-friendly lab operations. ●Supported digital learning initiatives by providing reliable technical assistance.
Network Operation Center (NOC) Engineer
SAGEMCOM
Freetown, Western Area, Sierra Leone
●Monitored, maintained, and optimized network infrastructure for high availability and performance. ●Conducted fault detection, incident response, and performance analysis to minimize downtime. ●Ensured seamless communication and operational efficiency across organizational systems. ●Supported proactive network management, improving reliability and user experience.
Network Engineer
Sierra Leone Commercial Bank (SLCB)
Freetown, Sierra Leone
• Installation and configuration of networking equipment at the Bo branch office of Sierra Leone Commercial Bank (SLCB) as a contractor. • Diagnosing and troubleshooting network errors
Network Technician
SYS-Net Business Solutions
Freetown, Sierra Leone
• Designed and installed well-functioning computer networks, connections, and cabling • Undertakes the installation of data equipment, including data racks, patch panels, cable trays, etc. • Utilizes appropriate testing equipment to test installed cables • Inspect LAN infrastructure and fix minor and major problems • Utilizes appropriate testing equipment to test installed cables
Education
Njala University
Telecommunications Engineering
Amity University Online
Bachelor of Computer Application (BCA)
Abdul B. Sesay's Contact Information
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