In a world where data and digital systems form the backbone of global business transformation,

Darlington Olelewe
Full stack developer (Java | Springboot | Javascript)

Darlington Olelewe stands out as an accomplished Full Stack Engineer dedicated to building intelligent, reliable, and scalable web solutions.

Currently working at Interswitch Group, one of Africa’s foremost financial technology companies, Darlington is at the forefront of innovation — creating platforms that enhance user engagement, improve business intelligence, and drive digital transformation.

His expertise spans Java, Spring Boot, React, Apache Spark, and Airflow, positioning him as a bridge between software engineering and data-driven infrastructure. From developing robust backend systems to crafting seamless frontend experiences, Darlington embodies the future of full-stack engineering.

Darlington Olelewe is a highly skilled Full Stack Developer with a strong foundation in backend engineering, data pipeline automation, and frontend development. He possesses extensive hands-on experience in building end-to-end systems that combine performance, reliability, and efficiency.

Having contributed to impactful projects across FinTech, banking, and energy, he continues to deliver transformative digital products that enable smarter decision-making and operational excellence. His engineering philosophy centers on creating technology that solves real-world problems — blending precision, innovation, and user-centric thinking.

PROFESSIONAL EXPERIENCE

Organization Role / Position Duration Key Responsibilities & Achievements
Interswitch Group Full Stack Engineer Feb 2024 – Present Leads the development of Reach Platform, a data-driven application revolutionizing targeted digital campaigns. Utilizes React, Redux, and Ant Design for intuitive frontends and Spring Boot (Java) for scalable backend APIs. Designed and optimized data pipelines using Apache Airflow and PySpark to enhance campaign analytics and reporting capabilities.
Union Bank of Nigeria Full Stack Engineer / Angular Developer Jun 2023 – May 2024 Developed and maintained banking applications using Angular and Spring Boot. Enhanced system performance and reduced data query response times by 25%. Collaborated with cross-functional teams to improve customer-facing digital platforms. Implemented reusable UI components and integrated backend APIs to enhance scalability and user experience.
Northwest Petroleum & Gas Company Application Developer Jun 2022 – Jun 2023 Designed and deployed enterprise applications for workflow management and internal reporting. Built RESTful APIs, optimized database schemas, and ensured data integrity across multi-user systems. Streamlined internal processes and introduced version-controlled deployment workflows.
Decagon Java Software Developer Sep 2021 – Jun 2022 Completed Decagon’s elite software engineering program, focusing on Java, Spring Boot, and Microservices Architecture. Developed and tested enterprise-grade backend systems while collaborating on Agile-based projects with global teams. Delivered production-ready APIs and system integration features.
Amawom Health Centre Healthcare Assistant Mar 2017 – Aug 2017 Supported healthcare operations and administrative systems. Contributed to early digitization of patient data and reporting workflows. Strengthened problem-solving and communication skills in community-based health service delivery.

EDUCATIONAL BACKGROUND

Institution Qualification Field of Study Duration
Michael Okpara University of Agriculture, Umudike Bachelor’s Degree Biochemistry 2014 – 2018

CERTIFICATIONS

  • LFS250: Kubernetes and Cloud Native Essentials
  • Scrum Fundamentals Certified (SFC)
  • Google IT Support Professional Certificate
  • Critical Thinking and Problem Solving
  • Mixtape: Learning Highlights on Personal Effectiveness

TECHNICAL SKILLS

  • Programming Languages: Java, JavaScript, Python
  • Frameworks & Libraries: Spring Boot, React, Angular, Redux, Ant Design
  • Data Engineering Tools: Apache Spark, Apache Airflow, PySpark
  • Databases: MySQL, PostgreSQL, MongoDB
  • Cloud & DevOps Tools: Kubernetes, Docker, Git, Jenkins
  • Software Development Practices: Agile, Test-Driven Development (TDD), RESTful API Design, CI/CD Pipelines

KEY ACHIEVEMENTS

  • Revolutionized Data Campaigning at Interswitch: Designed and deployed a data intelligence platform (Reach) enabling smarter and more precise campaign targeting.
  • Improved System Efficiency at Union Bank: Enhanced backend API performance and front-end responsiveness, leading to a 25% reduction in page load time.
  • Built Scalable Internal Systems at Northwest Petroleum: Developed a web-based reporting system that streamlined multi-department operations.
  • Delivered Production-Ready Microservices: Implemented modularized systems through Decagon’s training, enabling code reusability and maintainability.

For Darlington Olelewe, software development is more than writing code — it’s about solving problems with purpose and precision. His development ethos revolves around clean architecture, optimized systems, and continuous improvement.

He believes that great engineers don’t just build systems — they build experiences that empower users, enhance efficiency, and drive measurable results. His commitment to lifelong learning ensures that his work remains at the cutting edge of technology, innovation, and impact.

Darlington Olelewe exemplifies the new generation of software engineers reshaping Africa’s digital economy. With his mastery of Java, Spring Boot, React, and data engineering frameworks, he continues to design solutions that merge technology with strategy — enabling organizations to achieve digital excellence.

His journey is a testament to what’s possible when passion meets precision. As technology continues to evolve, professionals like Darlington remain the architects of transformation — building systems that define the future.

Connect with Darlington Olelewe:
www.linkedin.com/in/o-darlington