Abdulquddus Nuhu

Senior Backend Engineer with 5 years of professional experience building, deploying, and supporting production C#/.NET systems across fintech, banking, and enterprise environments. Strong expertise in C#, ASP.NET Core, REST APIs, Entity Framework Core, SQL databases, and third-party financial integrations. Hands-on experience building card lifecycle systems, banking applications, payment integrations, NIBSS workflows, and PCI-DSS-aligned card-data handling.

Experienced in asynchronous processing, background workers, database transactions, concurrency, API security, production troubleshooting, performance optimization, Docker/Podman deployments, Linux environments, and CI/CD. Comfortable taking backend services from development through testing, deployment, monitoring, and production support.

Senior Backend Engineer (C#.NET) at Aggregate Business Solutions Ltd (2025-09 – Present)

• Develop and maintain backend services for a Card Lifecycle Management System supporting Verve and Afrigo card schemes.
• Build and maintain ASP.NET Core APIs supporting card issuance, personalization, instant issuance, stock management, activation, blocking, and related card lifecycle operations.
• Implement PCI-DSS-aligned card-data handling, including PAN encryption before persistence and scheme-specific masking for controlled exposure.
• Develop asynchronous background workers for card issuance and stock-management operations, improving API responsiveness and supporting higher-volume processing.
• Integrate with NIBSS services including FAS and Consent Hub to support identity verification and banking workflows across enterprise applications.
• Develop internal integration services that centralize third-party service consumption, reducing operational costs and improving maintainability across products.
• Implement SignalR-based real-time updates for production and stock-management workflows, reducing dependence on frontend polling.
• Supported client-facing application demonstrations and knowledge-transfer sessions for a Bank of Agriculture project, explaining backend/application workflows to client stakeholders and supporting the transition to operational users.
• Generate operational Excel reports covering card requests, production activities, volumes, turnaround times, and scheme-level performance.

Senior Backend Engineer (C#.NET) at Innovantics Limited (2024-11 – 2025-11)

• Developed and maintained backend services for UBA and Ecobank biometric banking applications using C# and ASP.NET Core, implemented secure APIs and integrations with core banking systems.
• Provided ongoing backend support for the UBA production application, which had been running for several years across multiple application servers behind a load balancer and reverse proxy, resolving production issues and implementing new functionality.
• Served as the sole backend engineer responsible for building the Ecobank API integration, developing and integrating banking services including cash deposit, account enquiry, funds transfer, email update, report generation, and other banking operations.
• Managed the complete backend delivery lifecycle for the Ecobank services, from development and integration through staging, production deployment, and post-release support.
• Integrated NIBSS services to support customer authentication, identity verification, and secure banking workflows.
• Implemented Strategy and Factory design patterns to support multiple bank integrations within a shared backend codebase.
• Deployed backend services to Red Hat Linux using Podman and supported staging and production deployments for banking applications.
• Performed load testing using k6, investigated memory-efficiency issues, and implemented backend performance improvements.
• Collaborated with frontend, QA, IT Support, and DevOps teams from development through deployment.
• Maintained technical documentation covering application behaviour, integrations, and system architecture.

Backend Engineer (C#.NET) at Stella Maris Schools (2023-09 – 2024-11)

• Designed and developed a multi-tenant school management platform using.NET and relational databases.
• Implemented JWT-based authentication and authorization.
• Integrated Paystack for subscription billing supporting monthly and yearly payment options.
• Automated Linux deployments using GitHub Actions, reducing manual deployment effort by approximately 80%.
• Developed backend functionality and supported production troubleshooting and maintenance..NET Developer at HUBUK Technology Ltd (2021-11 – 2023-11)
• Developed backend services and REST APIs for a loan management system, supporting loan approval and customer workflows.
• Integrated Paystack for online form purchases and implemented webhook handling to receive and process payment events, update transaction status, and complete successful purchases.
• Implemented payment-related backend flows with appropriate validation and server-side transaction-state handling.
• Implemented TDD using xUnit and Moq, improving backend reliability and reducing production defects.
• Enhanced ERP modules including recruitment and contract-management workflows.

Bachelor of Engineering (B.Eng.) in Computer Engineering – Federal University of Technology, Minna (2015 – 2019)