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Abiola Olatunji

@abiolaolatunji

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Senior .NET Developer building secure, scalable banking and fintech systems with C#, Angular, and Azure.

Australia

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What I'm looking for

I’m seeking a Full-stack or Node.js backend .NET and Angular role where I can build secure, scalable fintech systems—using modern .NET, strong API design, Azure, and a collaborative Agile team focused on reliability, testing, and delivery.

I’m a highly skilled .NET Developer with 8+ years of experience building fast, secure banking and fintech systems using C#, .NET Core / .NET 6–8, ASP.NET Core Web API, Angular, and Azure. I’ve delivered scalable APIs and improved system reliability while handling millions of transactions, using patterns and practices like Clean Architecture, MVC, Razor Pages, and Blazor.

I recently completed an MSc in Data Science and brought hands-on AI experience as an AI Engineer Intern, working with Python, FastAPI, PyTorch, Hugging Face Transformers, and LLaMA to build and document model inference workflows. In my full-stack and backend roles, I delivered solutions like SSO with OAuth2, secure account opening with KYC validation, and event-driven integrations—always prioritizing secure coding, testing, and reliable deployments through CI/CD.

Experience

Work history, roles, and key accomplishments

AI Engineer Intern

Zimble

Jun 2025 - Nov 2025 (5 months)

Assisted in building an AI-powered product description generator using Python and LLaMA-based models, including development and testing of internal inference APIs. Supported workflow documentation and deployments across Azure/Azure DevOps and Hugging Face.

Python fastAPI PyTorch LLaMA REST APIs Docker Azure DevOps

Full Stack Engineer

Signature Bank

Jun 2023 - Jun 2025 (2 years)

Designed and implemented an OAuth2-based SSO solution and built a digital account opening service with KYC validation and real-time verification. Developed and maintained REST/SOAP/gRPC integrations and event-driven workflows, deploying containerized applications with CI/CD on Azure.

C#ASP.NET Core OAUTH2 Azure AD SQL Server Entity Framework CI CD

Software Developer

Xpress Payment Solutions

Jun 2021 - Feb 2024 (2 years 8 months)

Led backend development and provided architectural direction for fintech payment systems, rebuilding the payment gateway to support 2M+ transactions per month and reducing failure rate by 32%. Increased total revenue by adding storefront functionality for small businesses.

C#.NET 8+SQL Server Jenkins Bitbucket CI CD Agile Scrum Payment Gateways

Software Developer (Bank)

First Bank Nigeria

Jun 2020 - Jun 2021 (1 year)

Built and maintained secure financial applications and APIs using C#/.NET with MVC on Azure and SQL Server/Oracle. Delivered an interoperability wallet for instant transfers and completed MTO projects enabling international-to-Nigeria transfers via providers including WorldRemit, Ria, SendWave, and Western Union.

C#.NET Framework ASP.NET MVC Azure SQL Server Oracle API Development Interoperability Wallet MTO