Ogbonna Divine
Security-Focused Backend Engineer and Researcher
Software Engineer based in Lagos, Nigeria. I specialize in architecting secure API infrastructures, cryptographic implementations, and robust system design.
Work Experience
TATA Consultancy Services (Budapest, Hungary)
Software Engineer (Backend) Intern
Jun 2024 — Aug 2024- Engineered secure RESTful APIs using Java and Spring Boot, ensuring OWASP Top 10 compliance and 100% endpoint reliability via functional testing.
- Architected and optimized SQL databases for a 6-member agile team, reducing query response times by 30% for over 200 high-integrity records.
GAOTEK Inc. (New York, USA)
Technical Support Intern
Sep 2023 — Dec 2023- Managed IT support for 200+ users across Windows and MacOS, resolving 95% of technical issues same-day and optimizing system performance by 30%.
- Identified and addressed 10 key operational pain points, implementing initiatives that boosted overall user satisfaction by 15%.
Fordwin Limited Services (Lagos, Nigeria)
Cybersecurity Intern
Jan 2022 — Apr 2022- Conducted a comprehensive network security audit, documenting 7 critical flaws and 3 entry points to achieve a 60% improvement in security posture.
- Trained 10+ non-technical staff on cybersecurity best practices, increasing the organization's ability to recognize and mitigate threats by 50%.
Research Experience
TDK National Student Research Conference (Best Presenter)
Cryptanalysis of Cryptographic Algorithms in Nigerian Banking Security
2024 — 2025- Compared JWT+HMAC, JWT+RSA256, AES-GCM, BCrypt, HOTP and TOTP across security strength, speed, memory and real-world adoption in Nigerian banks
- Identified that most Nigerian banks sign JWTs without encryption and use vulnerable SMS-based OTP delivery
- Proposed layered security framework: Argon2 password hashing, JWT with AES-GCM encryption, push notification OTP
University of Debrecen
Modern Cryptography for Nigerian Banking Systems
2024 — 2025- Built secure banking authentication prototype in Java Spring Boot
- Implemented JWT signed with RSA256, AES-256-GCM encryption, HMAC-SHA256 OTP, BCrypt (cost factor 12), and Firebase push notifications as phishing-resistant OTP delivery
- Replaced email OTP with push notifications to eliminate interception risk common in Nigerian banking fraud
Projects
Vault-API
Spring Boot banking API prototype demonstrating secure authentication, authorization, and data protection
Protocol Stack
About Me
I'm a Software Engineer with a First Class degree in Computer Science Engineering from the University of Debrecen, Hungary graduating as a Stipendium Hungaricum Scholar and Talent UD Fellow. I specialise in building secure, high-performance backend systems using Java and Spring Boot. My experience spans API engineering at TCS, award-winning security research, and building systems where reliability and data integrity aren't optional.
