Marvellous Komolafe

A motivated cybersecurity professional with hands-on experience in threat analysis, supported by a background in modern frontend development. ISC2 Certified in Cybersecurity (CC) with practical exposure to SIEM tools, Kali Linux, and vulnerability assessment techniques. Skilled in identifying security weaknesses, supporting secure application development, and applying foundational knowledge of PCI-DSS, NIST CSF, and ISO/IEC 27001.

Brings a hybrid skill set combining development and security, with a strong interest in penetration testing and governance, risk, and compliance (GRC).

Crowd Tester at Test IO (2026-02 – Present)

• Executed regression testing across web and mobile applications to ensure new releases did not negatively impact existing functionalities, particularly in user flows such as authentication, product filtering, and checkout processes.
• Performed retesting of reported defects, validating fixes provided by developers and confirming resolution without introducing new issues, while ensuring alignment with expected behavior.
• Conducted exploratory testing sessions to uncover edge-case defects not covered in predefined test cases, identifying issues related to UI inconsistencies, broken redirects, incorrect product categorization, and unexpected system behavior.
• Created detailed bug reports following Test IO standards, including clear reproduction steps, expected vs actual results, environment details, and supporting evidence (screenshots/videos).
• Participated in multiple test cycles (functional, usability, and regression), collaborating with global testers and adapting quickly to different project scopes and requirements.
• Identified and reported high-impact bugs, including incorrect product filtering logic, inconsistent pricing behavior, and navigation issues affecting user experience.
• Applied testing techniques such as boundary value analysis and negative testing to improve defect detection and coverage.

Cyber security Intern at Dexa (2025-01 – 2025-02)

• Performed hands-on security assessments in controlled lab environments, identifying common vulnerabilities such as misconfigurations, weak authentication mechanisms, and exposed services.
• Utilized Kali Linux tools including Nmap for network scanning, basic enumeration techniques, and reconnaissance to map attack surfaces.
• Conducted introductory web application security testing, identifying basic vulnerabilities such as improper input validation and understanding concepts like XSS and SQL injection in lab scenarios.
• Analysed system and application logs to identify suspicious patterns, anomalies, and potential indicators of compromise (IOCs).
• Gained practical exposure to SIEM concepts using Elastic Stack, including log ingestion, visualization, and basic alert monitoring.
• Participated in simulated incident response exercises, learning processes such as detection, analysis, containment, and reporting.
• Explored network security fundamentals, including traffic flow, port behaviour, and common attack vectors such as brute force and phishing.
• Collaborated with team members in security discussions, breaking down real-world attack scenarios and defensive strategies.
• Documented findings from lab exercises and produced basic security reports highlighting vulnerabilities and recommended mitigations.

Associate Web Developer at Skilltop Empire (2024-09 – 2025-02)

• Designed and developed scalable web applications for medical and store management systems, ensuring performance, usability, and reliability.
• Implemented secure coding practices, reducing risks related to common vulnerabilities such as improper data handling and client-side exposure.
• Built responsive and accessible interfaces using React, Next.js, and Tailwind CSS, ensuring cross-device compatibility.
• Integrated APIs securely, handling authentication flows and protecting sensitive data in frontend interactions.
• Collaborated in agile teams, participating in sprint planning, code reviews, and iterative feature delivery.
• Optimized frontend performance through lazy loading, efficient state management, and asset optimization.
• Contributed to debugging and troubleshooting production issues, improving system stability and user experience.
• Maintained version control using Git and collaborated with backend developers to ensure seamless system integration.
• Applied basic web security principles such as input validation awareness, secure session handling concepts, and data protection practices.

Web Development Intern at Skilltop Empire (2024-06 – 2024-08)

• Developed reusable UI components and contributed to building modern web interfaces using JavaScript frameworks.
• Assisted in testing and debugging applications, identifying UI issues and functional inconsistencies.
• Learned and applied secure development practices, understanding the importance of preventing vulnerabilities during development.
• Gained experience with version control systems (Git) and collaborative development workflows.
• Improved knowledge of responsive design, accessibility standards, and user experience optimization.

Diploma in Cybersecurity – Altschool Africa (2024 – 2025)

B.Sc. in Biochemistry – Mountain Top University (2017 – 2021)