I have over 8 years of career experience in software engineering developing enterprise level applications. I am proficient in the Java ecosystem and related frameworks, specializing in microservice architecture and system integration. I enjoy collaborating with teams and am committed to continuous learning and driving technical excellence. Throughout my career, I have worked with diverse clients including banks and large service providers across Asia Pacific, continuously evolving my skills in backend development, cloud technologies, and microservices. I am passionate about delivering high-quality solutions and supporting smooth deployments and testing phases for large scale projects.

Gayan Sanjeewa

I have over 8 years of career experience in software engineering developing enterprise level applications. I am proficient in the Java ecosystem and related frameworks, specializing in microservice architecture and system integration. I enjoy collaborating with teams and am committed to continuous learning and driving technical excellence. Throughout my career, I have worked with diverse clients including banks and large service providers across Asia Pacific, continuously evolving my skills in backend development, cloud technologies, and microservices. I am passionate about delivering high-quality solutions and supporting smooth deployments and testing phases for large scale projects.

Available to hire

I have over 8 years of career experience in software engineering developing enterprise level applications. I am proficient in the Java ecosystem and related frameworks, specializing in microservice architecture and system integration. I enjoy collaborating with teams and am committed to continuous learning and driving technical excellence.

Throughout my career, I have worked with diverse clients including banks and large service providers across Asia Pacific, continuously evolving my skills in backend development, cloud technologies, and microservices. I am passionate about delivering high-quality solutions and supporting smooth deployments and testing phases for large scale projects.

See more

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate

Work Experience

Senior Java Developer at Aleph-Labs
October 1, 2024 - Present
Working with UOB Bank Singapore, I collaborate closely with system analysts, functional business analysts, technical managers, and testers to deliver the OCN project on time with business alignment. My responsibilities include designing and developing new features for multiple Java-based microservices using Spring Boot and REST APIs, leveraging feature toggles and trunk-based development. I enabled smooth and controlled deployments via CI/CD pipelines and feature flagging, supporting multi-country releases (Malaysia, Singapore, Hong Kong). Led key development efforts to decouple microservices from direct database dependencies, improving modularity and maintainability. I also support SIT and UAT testing phases and manage production incidents adhering to Jira and SLA standards while working with DevOps and QA teams for deployment readiness.
Senior Backend/Java Developer at DHL Information Services (Asia-Pacific) Sdn. Bhd
September 1, 2024 - August 22, 2025
Developed highly available and scalable microservices according to business requirements, maintained SOAP services, and handled change requests. Created and maintained CI/CD pipelines for OpenShift and AKS cloud environments. Delivered knowledge transfer sessions and guided new joiners on technical topics. Responsible for the performance testing and benchmarking new microservices. Collaborated closely with business analysts and technical architects to ensure adherence to both business logic and technical standards.
Senior Software/Java Engineer at Aeturnum Lanka (Pvt) Ltd
March 1, 2023 - August 22, 2025
Worked on multiple client projects including MODIFI, FINCH MONEY, and an internal project TIMEMATE. Responsibilities included code refactoring of microservices, implementing and maintaining third-party API integrations, collaborating with product managers to gather requirements and plan sprints, developing unit tests using JUnit and Mockito, bug fixes, and creating internal authentication mechanisms using Spring Security. Provided guidance to junior engineers and created base microservice projects.
Software Engineer at Epic Technology Group
December 1, 2021 - August 22, 2025
Engaged in agile development of financial technology solutions for banks in Sri Lanka including NDB NEOS mobile banking. Developed core components, integrating with core banks and content management systems using ISO8583 messaging. Developed REST APIs, involved in unit testing, and worked on digital banking solutions for CDB Bank. Also contributed to Terminal Line Encryption admin panel development using Struts2 and Hibernate. Responsibilities included bug fixes and unit testing.
Associate Software Engineer / Trainee Software Engineer at Boswin Group
November 1, 2017 - August 22, 2025
Started career involved in R&D and PHP development. Learned AngularJS and participated in some Android and Ionic app development.

Education

BEng (Hons) In Software Engineering (Second Upper) - TopUp at London Metropolitan University
January 1, 2022 - March 1, 2023
Graduate Diploma In Software Engineering (GDSE) at Institute of Java Software Engineering (IJSE), Sri Lanka
January 1, 2015 - January 1, 2017

Qualifications

AWS Solution Architect Associate
January 1, 2023 - August 22, 2025
Kubernetes for Java Developers
January 1, 2024 - August 22, 2025
Extending, Securing, and Dockerizing Spring Boot Microservices
January 1, 2024 - August 22, 2025
Running Spring Boot in Production
January 1, 2024 - August 22, 2025
Agile Software Development: Scrum for Developers
January 1, 2024 - August 22, 2025
Lambdas and Streams
January 1, 2024 - August 22, 2025
Learning OpenShift
January 1, 2024 - August 22, 2025
Microservices: Asynchronous Messaging
January 1, 2024 - August 22, 2025
Microservices: Design Patterns
January 1, 2024 - August 22, 2025
Serverless and Microservices for AWS
January 1, 2024 - August 22, 2025
Software Architecture: From Developer to Architect
January 1, 2024 - August 22, 2025

Industry Experience

Financial Services, Software & Internet, Transportation & Logistics