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Hi, I'm Arinze Nnaji. I'm a senior software engineer with extensive experience building scalable backend services, microservices architectures, and cloud-native deployments across Europe and Africa. I work primarily with Java and Node.js, Docker, Kubernetes, and modern CI/CD pipelines, delivering robust software for financial services and telecoms. I enjoy driving migrations from monoliths to microservices, designing event-driven processes, and collaborating with cross-functional teams to ship high-quality, interoperable systems. When I'm not coding, I mentor teammates and contribute to open-source initiatives.…Hi, I'm Arinze Nnaji. I'm a senior software engineer with extensive experience building scalable backend services, microservices architectures, and cloud-native deployments across Europe and Africa. I work primarily with Java and Node.js, Docker, Kubernetes, and modern CI/CD pipelines, delivering robust software for financial services and telecoms. I enjoy driving migrations from monoliths to microservices, designing event-driven processes, and collaborating with cross-functional teams to ship high-quality, interoperable systems. When I'm not coding, I mentor teammates and contribute to open-source initiatives.

Arinze Nnaji

Web Developer, Back-End Developer, Full Stack Developer, +2

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Hi, I'm Arinze Nnaji. I'm a senior software engineer with extensive experience building scalable backend services, microservices architectures, and cloud-native deployments across Europe and Africa. I work primarily with Java and Node.js, Docker, Kubernetes, and modern CI/CD pipelines, delivering robust software for financial services and telecoms. I enjoy driving migrations from monoliths to microservices, designing event-driven processes, and collaborating with cross-functional teams to ship high-quality, interoperable systems. When I'm not coding, I mentor teammates and contribute to open-source initiatives.…Hi, I'm Arinze Nnaji. I'm a senior software engineer with extensive experience building scalable backend services, microservices architectures, and cloud-native deployments across Europe and Africa. I work primarily with Java and Node.js, Docker, Kubernetes, and modern CI/CD pipelines, delivering robust software for financial services and telecoms. I enjoy driving migrations from monoliths to microservices, designing event-driven processes, and collaborating with cross-functional teams to ship high-quality, interoperable systems. When I'm not coding, I mentor teammates and contribute to open-source initiatives.

Available to hire

Hi, I’m Arinze Nnaji. I’m a senior software engineer with extensive experience building scalable backend services, microservices architectures, and cloud-native deployments across Europe and Africa. I work primarily with Java and Node.js, Docker, Kubernetes, and modern CI/CD pipelines, delivering robust software for financial services and telecoms.

I enjoy driving migrations from monoliths to microservices, designing event-driven processes, and collaborating with cross-functional teams to ship high-quality, interoperable systems. When I’m not coding, I mentor teammates and contribute to open-source initiatives.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Work Experience

Senior Software Engineer at Cabonline

December 1, 2025 - Present

Built and maintained distributed backend services supporting large-scale taxi and mobility operations across Nordic markets. Designed and implemented event-driven workflows for order and payment processing, including automated refund handling via Swish. Integrated and versioned protobuf-based contracts, migrating from deprecated schemas to system-wide standards to improve interoperability and reduce integration failures.

Senior Software Engineer at Telenor

October 2, 2021 - December 1, 2025

Improved concurrency in backend processing, boosting throughput and efficiency. Integrated Temporal workflows to automate complex processes. Implemented a Node.js internal client tool to aid incident resolution. Improved inventory management by optimizing data handling and API integrations.

Consultant at Sigma Consulting (at Telenor)

May 2, 2019 - September 20, 2021

Migration of old monolithic application to a microservices-based approach. Epic-based development and implementation of eSIM integration. Implemented future-term termination subscriptions on customer demise (integration with third-party API). Migrated subscriptions from old system to the new system. Implemented a validation service to mitigate order processing issues.

Senior Software Engineer at First City Monument Bank

June 1, 2018 - May 1, 2019

Service implementation and delivery on IBM's Integration Bus (IIB). Initiated the development of a central collections service to aggregate multiple single-vendor solutions. Designed and implemented applications in an agile environment utilizing a test-driven development approach.

Software Engineer at Interswitch Limited

June 2, 2015 - June 2, 2018

Key role in the development of a fraud detection system. Re-implementation of an online merchant payment platform (Webpay). Development of a Merchant Acquisition Portal for a QR code scan to pay service. Implementation of an internal logging library for central logging purposes.

Web and Mobile Developer at Novedad Limited

August 1, 2013 - January 1, 2015

Building ecommerce solutions (OpenCart, Magento) and custom modules/plugins to suit business needs. Website and mobile development.

Web and Mobile App Intern at Terragon Limited

March 2, 2012 - September 20, 2012

Web and Mobile app development (PhoneGap).