* Develop and maintain source code. Technology using: Java 8/11/17, Spring, Kafka, PostgreSQL, MongoDB* Collaborated with business analysts to design and hand-one implementing database, design system for new feature.* Collaborated with devops to write and edit Dockerfile in new project.* Contributing to the a library public source(JavaPoet) to resolve issue and to automatically generate source code for creating Entity, Object from 3rd service integrating.* Design and hand-one implementing, improve code base, lib, utils for reducing time taken to generate file(excel, word, pdf, email,...)* Reduce time to writing repository by build flexible query using Specification (Spring Data JPA)* Participated in code reviews, merged code.* Implemented monitoring and logging solutions(unique identifier id, monitor async task, time-running,..), leading to reduction in time taken to identify, hide sensitive data and resolve production issues. (Log4j2)* Participate and contribute ideas on git strategy(in team) to reducing in time taken to resolve conflict.

* Deploy otp service (sms, smartotp). Technology using: Jetty, Oracle.* Refactor sms, email sending service from .NET to Java, maintain and develop feature. Technology using: Jetty, Oracle.* Design and build code base for KB Buddy, a virtual core trading system. Technology using: Vert.x, Ignite, MongoDB.- Design and build code base.- Writing webservice reactive promgraming with async API with Vert.x and Jetty.- Writing config Log4j2, Unit Test and some Bash Script for deploy.- Cluster multi-server with in-memory cache Apache Ignite.- Monitor services using Grafana and Prometheus.- Writing PL/SQL to handle the business requirement under the database layer.- Refactor the old code using some common design patterns: Singleton, Builder, Observer, Chain of Responsibility,...- Research new technology to migrate from old technology: Hazelcast -> Apache Ignite, Jetty -> Vertx,....

- Writing both front-end and back-end codes for the application. (Springboot, React & Typescript)- Applying permissions by roles to users.- Design and implement GIS project using GeoServer, QGIS, OpenLayers.- Testing performance using JMeter.- Sharing knowledge among team members.