Designed and implemented new Restful APIs to publish transaction data to internal users using Spring Boot, PostgreSQL, AWS Secrets Manager, Docker, Kubernetes, and Kong API Gateway. Redesigned and refactored two Spring Boot batch jobs to improve performance by 120% using Spring Batch and three Pods running in parallel on Kubernetes, which read transaction data files from AWS SQS, transformed the data, and imported it to PostgreSQL. Investigated and resolved race condition issues when running microservices in multiple instances, improving overall system performance. Utilized GitLab for CI/CD and code reviews. Applied Liquibase to manage changes in the PostgreSQL DB structure across multiple environments. Used Terraform to modify infrastructure in AWS EC2, AWS SQS, and AWS RDS.

Refactored the legacy code base to improve the logger, enhancing error and exception detection. Reviewed two core project code bases to address resource leaks. Enhanced the performance of existing code by utilizing parallelStream and CompletableFuture. Migrated legacy batch jobs to a new distributed job scheduler using Spring Boot, Kafka, and MongoDB.

Ngoc joined the project from the beginning to create high-level design and POCs. Integrated the Twilio Chat bot with WhatsApp and Azure Bot Service. Designed the architecture to receive messages from the Twilio chat bot and send them to the Azure Bot Service, which communicates with REST APIs. Implemented REST APIs using Azure Function App, Traffic Manager, and API Management. Designed the metadata database using Azure MySQL. Designed knowledge and checklist graph databases using Azure Cosmos DB with the Gremlin API. Worked on Azure DevOps for continuous integration (CI).

Ngoc joined this project from the beginning to communicate directly with the customer and third-party for gathering the requirements. Created high-level designs and system diagrams for both the current and future states of the customer platform using Enterprise Architect Sparx. Developed detailed designs for new features and presented them to the customer's technical team. Researched new tools, frameworks, and plugins to fulfill technical requirements not previously experienced. Implemented a POC for Boomi CI/CD in the Azure environment. Researched and developed multiple approaches for RESTful API development workflow. Implemented Boomi workflows, unit testing, integration testing, and provided deployment support.

Migrated APIs from Mulesoft 3 to Mulesoft 4. Implemented custom features using Spring Boot to resolve complex business logic. Managed stakeholders through build and test stages utilizing Jira and Confluence. Developed best practices for Postman requests and mocks to expedite testing processes. Created custom integration for a third-party service, which included developing a mocking framework and ensuring self-management.

Designed and transitioned the existing system from a monolithic structure to microservices using Vert.x, Spring Boot, MongoDB, ElasticSearch, and Docker, enhancing the scalability and performance to handle an increased number of sensors for each customer. Suggested and devised a new ETL system using Talend to replace old data importers, enabling connectivity to diverse data sources such as MQTT, SFTP, MongoDB, SQL DB, APIs, and MAXIMO, with minimal development effort and improved data transformation efficiency for high-volume data. Developed a new ETL jobs management system using Airflow to replace previous Linux crontab scheduling, improving maintenance ease with features like a friendly UI, auto-retry, email notifications, smart logging, and comprehensive reporting. Led the drive for new feature development and technology selections through all stages of the product lifecycle. Collaborated closely with product owners to understand requirements and deliver appropriate solutions. Implemented APIs using MuleSoft to facilitate data access for third parties and customers. Provided expertise directly to customers, helping them identify features that deliver maximum business value.

Collaborated closely with clients and the solution architect to provide optimal solutions for their requirements. Served as a full stack developer to implement an application enabling StarHub staff to update, suspend, and deactivate mobile, TV, and Internet accounts. Integrated the application into StarHub's main system, allowing staff to efficiently handle ad-hoc customer requests.

Design banking workflows using IBM Case Management. Implement business logic with Spring 3, Hibernate, Oracle 11g, SQL 2005, and JRule. Support the DevOps team to deploy the application on WebSphere 7 webserver.

Migrate FileNet framework from version 3.5 to 4.5 and resolve version incompatibility issues. Implement new business logic using J2EE, JSF, and SQL 2005. Deploy the updated application to WebSphere 6.

Implement new campaigns and products for the Zurich Insurance web application using Java/J2EE and DB2. Support the DevOps team in deploying the application to a WebSphere 6 web server.

Implement new workflows for banking document processing using Java/J2EE, Struts 2, and SQL. Implement new features to receive customer data and generate billing documentation and reports using Java/J2EE, Filenet 4.5, and DB2. Deploy the application to the Tomcat 7 server.