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Tobenna Ononaku

@tobennaononaku

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Senior .NET backend engineer architecting scalable distributed systems for fintech platforms.

Nigeria

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What I'm looking for

I’m looking for a role where I can architect resilient, cloud-native .NET backend systems—especially distributed microservices—while driving performance, concurrency-safe processing, and reliable CI/CD. I want to tackle hard migrations and scale critical transaction paths.

I’m a high-impact .NET Backend Engineer specializing in architecting scalable distributed systems for fintech platforms. I focus on concurrency control, high-throughput processing, cloud-native infrastructure, and backend performance optimization.

At Ivoryleap ltd, I architected a high-performance parallel document generation pipeline using System.Channels and IText7 to generate 100k-row PDFs with controlled memory usage and improved throughput. I also implemented Redis-based distributed locking on Azure Kubernetes Service (AKS) to eliminate race conditions across worker services, and optimized EF Core transaction queries by reducing entity projection footprint from 43 to 24 columns—improving execution performance and reducing database load.

Previously at Eureka Digital, I led legacy .NET Framework to .NET Core migrations to improve deployment flexibility and runtime performance, and used Azure Service Bus and Azure Blob Storage to strengthen asynchronous coordination and distributed data interactions. Earlier, I built and optimized high-throughput .NET Core RESTful APIs, standardizing monitoring and CI/CD workflows with distributed infrastructure using Azure Service Bus, Azure Functions, and Cosmos DB—helping teams deliver reliable backend services for production.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer (.NET)

Current

Ivoryleap Ltd

Oct 2023 - Present (2 years 8 months)

Architected and implemented a high-performance parallel document generation pipeline using System.Channels and iText7, enabling efficient generation of 100k-row PDF documents with controlled memory usage. Integrated Redis-based distributed locking on Azure AKS, optimized EF Core transaction queries by reducing entity projections from 43 to 24 columns, and improved cross-service consistency for tra

C .NET ASP.NET Core EF Core System.Channels IText7 Redis Distributed Locking Azure Hangfire

Senior Software Engineer

Eureka Digital

Aug 2022 - Sep 2023 (1 year 1 month)

Led architectural decisions for a core platform, driving scalability, resiliency, and high availability while mentoring engineers on backend standards and practices. Spearheaded migration from legacy .NET Framework to .NET Core and improved asynchronous coordination using Azure Service Bus and Azure Blob Storage, alongside CI/CD workflow enhancements.

.NET Core .NET Framework ASP.NET Core Azure Service Bus Azure Blob Storage CI CD

Software Engineer

OhmsTech

Nov 2018 - Sep 2021 (2 years 10 months)

Developed and optimized high-throughput RESTful APIs in .NET Core for enterprise and client-facing applications. Built distributed backend infrastructure with Azure Service Bus, Azure Functions, and Cosmos DB to support thousands of concurrent users, and improved deployment reliability and observability through standardized monitoring and CI/CD workflows.

C .NET Core RESTful APIs Azure Service Bus Azure Functions Azure Cosmos Observability CI CD Distributed Systems

Software Developer

NOOOBit Tech

Feb 2017 - Nov 2018 (1 year 9 months)

Designed and implemented N-tier desktop application architectures using C# and WPF, separating presentation, business logic, and data access for maintainability and scalability. Built a Computer-Aided Learning (CAL) application with interactive modules and optimized data access using SQL stored procedures and backend performance improvements.

C .NET WPF desktop application development UI UX Design