Grant Oseji

Built a production-grade authentication and session architecture (Node.js, TypeScript, JWT HS256) and developed secure Express.js and Next.js access controls to prevent token hijacking and unauthorized access. Engineered financial services including AES-256-GCM encrypted credential storage, kobo integer monetary handling, optimistic concurrency with retries, and multi-document MongoDB transactions for atomic ledger updates.

Contributed to a scalable, event-driven microservices backend using Domain-Driven Design and a Controller → Service → Repository architecture. Implemented transaction lifecycle state machines and interservice communication across RabbitMQ, gRPC/REST, and Kafka, while enforcing multi-tenant isolation and RBAC with JWT.

Designed and delivered high-performance full-stack web and mobile solutions using Next.js, Go, Python, and MEAN/MERN stacks for global clients. Built event-driven architectures with PostgreSQL/MongoDB and Kafka/RabbitMQ, automated CI/CD with GitHub Actions and GitLab CI using Terraform, and improved API security and observability with JWT/CORS/Helmet and OpenTelemetry.

Provided administrative support, maintained office documentation, and created basic visual materials using Adobe Creative Suite.

Pursuing a Bachelor of Science (B.Sc.) in Computer Science, expected completion in July 2027.

Completed an Alison diploma in MEAN Stack in 2022.

Completed an Alison program on web responsiveness using Bootstrap in 2022.

Activities and societies: Completed via CS50 | Cursa Platform.

Completed an intensive program on React Native, focusing on core reactive mobile patterns, UI layout architecture, and cross-platform native execution bridges.

Completed a structured Flutter course covering workspace design, state-management architectures, and performance profiling within Dart ecosystems.

Completed iOS Application Development training focused on Swift, Xcode interfaces, navigation guidelines, and Apple environment compilation workflows.

Activities and societies: Completion verified on the course module.

Verified completion of a Kotlin short course covering general application assembly and rapid deployment strategies.

Completed training in project management, including lifecycle modeling, delivery timelines, product discovery, and resource coordination.

Completed a Python programming professional certificate covering core engineering strategies, algorithm complexity analysis, and object-oriented backend design.

Validated training in UX design, including user flow journeys, wireframes, user testing procedures, and interactive high-fidelity frameworks.

Completed soft-skills training focused on critical thinking, decision-making, and problem-solving through analytical reasoning and cognitive error containment.

Activities and societies: Completed the full four-module track.

Successfully completed a web development diploma, including a full four-module comprehensive web development track.

Completed an advanced React JS certification covering concurrent hook architectures, system states, and virtual rendering operations.

Completed a graphic design diploma covering vector layout geometry, design balance principles, and standard brand package creation workflows.