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I'm a Java Developer with hands-on experience building secure payment and wallet systems for financial services. I specialize in RESTful APIs and microservices using Spring Boot, and I’ve worked with Oracle databases, including query optimization and PL/SQL. I’ve also integrated Kafka for real-time data streams and supported cloud migrations. I enjoy delivering scalable, efficient backend solutions for banking applications and collaborating with cross-functional teams to drive business value.…I'm a Java Developer with hands-on experience building secure payment and wallet systems for financial services. I specialize in RESTful APIs and microservices using Spring Boot, and I’ve worked with Oracle databases, including query optimization and PL/SQL. I’ve also integrated Kafka for real-time data streams and supported cloud migrations. I enjoy delivering scalable, efficient backend solutions for banking applications and collaborating with cross-functional teams to drive business value.

OLORUNTOBI AJAYI

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

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I'm a Java Developer with hands-on experience building secure payment and wallet systems for financial services. I specialize in RESTful APIs and microservices using Spring Boot, and I’ve worked with Oracle databases, including query optimization and PL/SQL. I’ve also integrated Kafka for real-time data streams and supported cloud migrations. I enjoy delivering scalable, efficient backend solutions for banking applications and collaborating with cross-functional teams to drive business value.…I'm a Java Developer with hands-on experience building secure payment and wallet systems for financial services. I specialize in RESTful APIs and microservices using Spring Boot, and I’ve worked with Oracle databases, including query optimization and PL/SQL. I’ve also integrated Kafka for real-time data streams and supported cloud migrations. I enjoy delivering scalable, efficient backend solutions for banking applications and collaborating with cross-functional teams to drive business value.

Available to hire

I’m a Java Developer with hands-on experience building secure payment and wallet systems for financial services. I specialize in RESTful APIs and microservices using Spring Boot, and I’ve worked with Oracle databases, including query optimization and PL/SQL. I’ve also integrated Kafka for real-time data streams and supported cloud migrations.

I enjoy delivering scalable, efficient backend solutions for banking applications and collaborating with cross-functional teams to drive business value.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Software Engineer (Java & Springboot) at BanffPay

November 1, 2025 - Present

Engineered and maintained critical backend services for international payment processing, integrating with major African mobile money operators. Led the MTN MoMo (Liberia) and Orange Money integrations, building RESTful APIs in Java/Spring Boot and TypeScript to manage collections, disbursements, and real-time transaction status queries. Developed the Sochitel bill payment service, integrating a third-party API for airtime, data, and utility vending across multiple countries. Designed and implemented a robust Backend Admin Portal for transaction monitoring, user management, and operational oversight. Deployed services as containerized applications with Docker and CI/CD pipelines using GitHub Actions. Managed infrastructure as code with Terraform to provision AWS resources such as ECS, Fargate, and Application Load Balancers.

Software Engineer (Java & Springboot) at Consolidated Hallmark Holdings PLC

March 1, 2025 - October 1, 2025

Implemented Wallet, OTP/PIN, and Billing & Payments systems, including a Work Breakdown Structure to manage timelines and dependencies. Developed RESTful APIs for wallet creation, transaction processing, and authentication services using core Java fundamentals. Engineered OTP/PIN Authentication Services using a microservices architecture for enhanced security. Integrated a Payment Gateway for real-time billing and wallet deductions. Executed comprehensive Unit, Integration, and User Acceptance Testing (UAT) and managed deployment to production.

Backend Developer (Java, Springboot & React) at Orchestra Business Solutions

January 1, 2024 - February 1, 2025

Directed the development of a comprehensive restaurant management system using Java, Spring Boot, React, and TypeScript to ensure seamless backend and frontend integration. Engineered and maintained RESTful APIs for robust data handling and business logic. Optimized database schemas for menus, orders, and customer profiles, emphasizing high performance and scalability. Implemented state management with Redux on the frontend and conducted rigorous testing to ensure quality.

Backend Developer (Java, Spring Boot) at Footprint Mentorship

January 1, 2024 - May 1, 2024

Developed the ContactUs feature by creating an endpoint to handle user inquiries, sending email notifications to the organization, and archiving submissions in CSV format. Authored clear Swagger documentation for API usage and deployed the solution to Render for accessibility.

Backend Developer (Java, Springboot) at Moneta (Algomath)

January 1, 2023 - December 1, 2023

Contributed to the Kibou Registry project by creating endpoints for event management, including scheduling features with robust testing using Postman. Deployed the project to Render, ensuring scalability and accessibility. Engaged in full project lifecycle management from requirements gathering to deployment and testing, developing high-performance Java applications and collaborating with cross-functional teams.