Olivia Madu: Engineering Scalable Fintech Infrastructure with Precision, Performance, and Purpose
As Africa’s fintech ecosystem continues to expand at record pace, the need for highly skilled backend engineers capable of building secure, scalable, and high-performance financial systems has become increasingly critical. Among the professionals shaping this landscape is Olivia (Onyinye) Madu, a Senior Software Engineer at Interswitch Group, whose expertise spans Java, Spring Boot, microservices architecture, and enterprise payment integrations.
With years of hands-on experience in commercial software development and fintech infrastructure, Olivia has steadily established herself as a technically grounded and performance-focused engineer committed to building modern, resilient financial platforms
Recent developments in Nigeria’s digital payments and financial services ecosystem have amplified the importance of secure interbank integrations, high-availability systems, and transaction reliability. At the heart of several such initiatives is Olivia Madu, currently serving as a Senior Software Engineer at Interswitch Group, where she contributes to mission-critical backend services powering the Quickteller platform.
Her work includes integrating with national payment infrastructures such as NIBSS, building secure SOAP-based endpoints, handling encryption and validation mechanisms, and enhancing transaction reliability through modular service refactoring and event-driven architectures. These contributions align with broader industry goals of strengthening cross-border transactions and modernising financial infrastructure across Africa.
Olivia (Onyinye) Madu is a results-driven Senior Software Engineer with strong expertise in Java, Spring Boot, Kafka, Docker, Microservices Architecture, and SQL-based systems. She combines deep technical capability with agile execution, consistently delivering clean, testable, and optimised backend services.
Her professional strengths include:
- Scalable backend development for fintech platforms
- Secure API integrations and interbank transaction systems
- Microservices architecture and modular system design
- Performance optimisation and caching strategies
- Agile/Scrum collaboration and DevOps deployment workflows
She is recognised for writing clean, readable code and maintaining a strong focus on quality assurance through tools such as JUnit, Mockito, SonarQube, Swagger, and Azure DevOps.
Professional Experience
| Organisation | Role / Position | Duration | Key Responsibilities & Contributions |
| Interswitch Group | Senior Software Engineer | July 2025 – Present | Leads backend development initiatives for fintech systems, ensuring scalability, security, and high performance across enterprise payment platforms.
Olivia (Onyinye) Madu Profile |
| Interswitch Group | Software Engineer | June 2023 – August 2025 | Built and maintained scalable backend services for the Quickteller platform using Java and Spring Boot. Integrated NIBSS for real-time interbank transfers with encryption and validation. Contributed to Phoenix and Uganda B2B API integrations, implemented OAuth2 and JWT security, refactored transaction systems into modular services, improved response time by 30%, and enhanced reliability using Kafka and retry logic.
Olivia (Onyinye) Madu Profile |
| Decagon | Software Engineer | July 2022 – June 2023 | Strengthened backend engineering expertise, contributing to structured product development in agile teams.
Olivia (Onyinye) Madu Profile |
| Custodian Investment Plc | Software Engineer | March 2020 – August 2022 | Contributed to enterprise software development within the financial services sector, supporting business-critical systems.
Olivia (Onyinye) Madu Profile |
| JUMBO SPORT MART | IT Support Officer / Digital Marketing | February 2017 – April 2020 | Developed web applications using HTML, CSS, and JavaScript. Built reusable code libraries and created landing pages for company platforms while supporting digital marketing operations.
Olivia (Onyinye) Madu Profile |
Education & Certifications
Education
- Bachelor of Science (B.Sc.) – Pure & Industrial Chemistry
Nnamdi Azikiwe University (2012 – 2016)
Olivia (Onyinye) Madu Profile
- Certification in Human Resources Management
Rahn Wesley Institute of Management, UK (2020)
Olivia (Onyinye) Madu Profile
Professional Certifications
- Lean Six Sigma Yellow Belt
- Fundamentals of Electronic Payment
- HSE Level 3
- Work Ethics & Professionalism
Technical Skills & Tools
Core Technologies
- Java
- Spring Boot
- Kafka
- Docker
- Microsoft SQL Server
- Microservices Architecture
DevOps & Tools
- Azure DevOps
- Jira
- Git
- Swagger
- SonarQube
- JUnit & Mockito
Strength Areas
- Azure DevOps
- Lean Six Sigma
- Core Switching
- Secure API Development
- Performance Optimisation
Olivia Madu represents a new generation of African software engineers driving the backbone of digital payments and fintech infrastructure. Her ability to combine secure integrations, modular system design, and performance optimisation positions her as a critical contributor to modern financial ecosystems.
As fintech platforms continue to expand across borders and user bases grow exponentially, engineers like Olivia will remain instrumental in ensuring that systems are not only innovative—but also resilient, secure, and scalable.
From building high-performance backend services to integrating secure national payment systems, Olivia (Onyinye) Madu continues to demonstrate technical excellence and strategic thinking within the fintech industry. Her journey reflects a powerful narrative: when engineering precision meets continuous learning, innovation becomes sustainable.
Connect with Olivia (Onyinye) Madu
LinkedIn: www.linkedin.com/in/olivia-madu-6266a1100
