As a Java backend developer at the client Nextrow, working on all development phases, collecting non-technical and technical requirements, designing system architecture, and performing software development procedures based on the Spring MVC framework.

As a Java backend developer of a development team that has implemented an internal personalization data service that exposes the historical watching of each user, proposed proper programs to end-users.Responsibilities• Used Spring framework and microservice experience to implement new Web APIs.• Reversed engineering source code of an in-house system without any design documents.• Used reactive programming, VertX, to transform data from another meta-data system and store it in the Redis cache.• Maintained our personalization data service, fixing production and unstable long-term issues.• Used the Mockito library to do unit tests and mock incoming requests.• Worked on CI/CD pipelines at a basic level by using Concourse, Kubernetes, and Helm chart.• Involved in troubleshooting production issues by using Splunk, ELK Search, and Grafana charts.Technologies: Java, Multi-threading, Spring MVC, Spring Boot, REST API, Microservice, VertX, Redis, Postman, Concourse, Kubernetes, Terraform, Helm, Splunk, Elastic Search, Logstash, Kibana, Grafana.

As a Java backend developer of a development team that has implemented an internal configuration management system including three sub-systems, managing all configurations, reading configurations, and updating configurations to relevant applications.Responsibilities• Used the library AWS S3 SDK to move the local Oracle database to relevant AWS S3 buckets.• Used RabbitMQ to broadcast configuration changes and Grafana chart to display them.• Designing database schema, implementing effective PL/SQL statements, and tuning to optimize SQL statement performance on MS. SQL.• Improved performance by using data caching and changing the workflow on how to update configuration changes from passive mode to active mode.• Implemented new web APIs by Microservices.• Proposed an approach for applying a non-blocking mechanism to the current system by WebFlux and MongoDB.• Involved in troubleshooting production issues by using Splunk, ELK Search, and Grafana charts.Technologies: Java, Multi-threading, Spring MVC, Spring Boot, JPA, Hibernate, REST API, Microservice, RabbitMQ, Spring Cloud Config, Webflux, MongoDB, Oracle, AWS S3, Postman, Spock, Grafana.

Student of the Master’s program, a Java developer of a development team that implemented academic projects, Attendance Management System, Library Management System, Online Market System.Responsibilities• Clarified requirements and project scope, developed high-level design document of modules.• Implemented all layers, building GUI and microservices, using the core Java to implement services, as well as made some REST API calls to other modules to get master data.• Used the Netflix discovery service to register microservices and Spring API gateway for serving external API calls.Technologies: Java, Multi-threading, Spring MVC, Spring Boot, JPA, Hibernate, REST API, Microservice, RabbitMQ, Lambda, MySQL, H2, Postman, Git, Thymeleaf, Angular, React.

As a Software Engineer and a project Lead, leading 3 DiCentralB2B e-commerce projects.Responsibilities• Clarified requirements and project scope with product owners.• Developed high-level design documents and controlled development teams.• Implemented data mapping between EDI formats and databases in all EDI transactions.• Implemented REST APIs to expose endpoints for other systems.• Developed front-end pages for an EDI transaction dashboard.Technologies: Java, Multi-threading, MS SQL, Junit, HTML, CSS, JavaScript, Bootstrap.

As a Software Engineer and a project Lead, leading outsourcing projects, and in-house projects from raw requirements.Responsibilities• Discussed requirements and project scope with product owners.• Used UML diagrams to design projects at a high level.• Developed front-end pages and applied the Spring MVC framework to implement the financial module, including project resources and costs.• Designing database schema, implementing effective PL/SQL statements, and tuning to optimize SQL statement performance on MS. SQL.• Managed and released an internal project for integrating all data of HR, Production, and Finance, and generating data integration reports by the Crystal Report.Technologies: Java, MS SQL, Junit, Log4J, UML, Agile/Scrum, HTML, CSS, JavaScript, Bootstrap.

As a Software Developer, designed and developed core libraries and outsourcing projects.Responsibilities• Clarified requirement documents and functionalities of clients' existing systems to create technical specifications and high-level design documents by UML diagrams.• Used C++ to implement libraries for capturing complex UI controls in existing applications.• Implemented a simulator to test POS machines with over 30 end-user operations and outputs.• Conducted code review to maintain code quality; conducted unit testing and troubleshooting.• Researched and implemented a core library for voice chat and video conferencing.Technologies: Java, C++, Visual C++, Struts, Spring framework, HTML, CSS, JavaScript, Bootstrap, XML/XSL, PL/SQL, MySQL, MS SQL, Ant.