• Develop microservices in AWS ECS to support integration with various services such as CIAM• Implement event-driven and distributed Lambda function for handling medical data, passing rigorous security checks to safeguard PII and PHI. • Contribute as a backend software engineer on the Patient Engagement Suit development team.• Design a circuit breaker pattern for Lambda functions.• Implement a GraphQL fronted by many micro-services.• Collaborate with a cross-functional team from the US, using agile methodologies for development, ensuring real-time project updates.• Comply with quality standards by writing unit tests and E2E tests, achieving a minimum of above 80% code coverage to ensure robust and reliable code. • Utilize AWS components, including Lambda, ECS, Margate, S3, RDS Aurora, DynamoDB, ElasticSearch, CloudWatch, SQS, STS, EventBridge, Kinesis Stream, X-Ray, CodeDeploy, and Step Functions.• Set up an automatic backup plan for RDS, ensuring compliance with RTO and RPO requirements using Terraform.

HSBC (Java, Jquery, Spring-web, Hibernate, WebLogic, Oracle, gradle, spring-batch, Redhat)• Upgrade legacy credit card applications from Java 1.4 to Java 8 with Spring Boot. • Refactor batch jobs using spring-batch to enhance the performance and manageability• Implement restful services for integrating other external services.• Maintain a fraud detection application (Falcon).• Integrate mainframe system.TCB (Java, spring-boot, Spring-data-JPA, Hibernate, CXF, WebSphere, AIX, IBM MQ, IBM IMS, DB2, ReactJs, Redux, maven)• Customize a credit card application for fulfilling user requirements.• Design a transaction monitoring dashboard using TypeScript, ReactJS, and Redux. The dashboard provided many metrics that allowed users to view the performance and troubleshooting easily.• Integrate HSM using socket.• Integrate many mainframe systems using IBM IMS.• Integrate IBM MQ with the message content in SOAP.• Set up and configured WebSphere cluster. ECS (Java, spring-boot, spring cloud, Spring-data-JPA, Hibernate, PostgreSQL, ReactJs, Redux, Nginx, Docker, Kubernetes, Istio, JForg, Prometheus, Grafana, Jaeger )• Refactored an existing monolithic card application to a cloud-native architecture.• Set up visualizing metrics with Grafana.• Set up a service mesh using Istio.• Set up Kubernetes cluster with Kubeadm.• Integrate GitHub, Jenkins, JFrog.

Google’s Direct Carrier Billing Service (Java, Spring-boot, Spring-data-JPA, Hibernate, Oracle, Redhat, JMeter)• Implement APIs to integrate Google's Direct Carrier Billing services, enhancing TWM's existing billing system. These APIs enable an alternative billing approach for users on Google Play, with payments conveniently charged on the mobile phone bill the following month. The implementation adheres to Google's specifications, utilizing SOAP, WS-Security with x509, and mutual TLS.Apple’s Direct Carrier Billing Service (Java, Spring-boot, Spring-data-JPA, Hibernate, Oracle, Redhat, JMeter)• Integrated ELK stack into the billing system for monitoring. It collects and analyses all transaction logs from the Google and Apple billing systems, which shortens time in finding the root cause when the outage occurred.• Integrated Apple’s Direct Carrier Billing Service.MyFone m-buy system.( Java, Spring, Hibernate, Oracle, JQuery, JasperReport)• Maintain the existing E-commerce system.• Develop new reports using the JasperReport tool.

E-Invoice System.• Develop and maintain an E-invoice system. • Develop an adapter using JNI to allow another programming language to call an e-invoice encryption library.• Improve performance and optimize the SQL queries for the uniform invoice lottery checking program.• Customize the KIOSK system for serving end users.

E-Tax system• Refactored a legacy E-tax system to spring.• Set up Jenkins for automatic building and deploying.• Develop new reports using the JasperReport tool.