Guojin Dong

Experience

1. Backend Developer

   Amazon

   Jan 2017 — Present · Fremont, CA, US

   Description: Worked on development of Vendor and Supplier management portal for Highland Hospital. Managers qualify the vendors and assign different qualification codes. Purchase orders are automatically generated for the vendors depending on their qualification code and performance. Responsibilities: Involved in developing multi-thread high performance applications server-side workflow. Participated in various stages of the project life cycle mainly design, implementation testing, deployment and enhancement of the application. Applied Agile methodologies for software development Developed Java interfaces using Spring framework and Ajax. Used Advanced Java concepts and Data structures including Collection objects, Arrays, HashMap. Maintained Interface compatibility and concurrency in the project using Java 8 new features like default, static methods and Concurrency API. Used Java 8 Method References feature to point to methods by their names and also used functional Interfaces. Used data pipeline for two MapReduce jobs and build database. Redis, Mongo DB and MySQL are used for database, Node.js is for the backend. Used RESTful Webservices to extract product and warranty information. Implemented business logic using Session beans, Servlets and Stored procedures. Development of persistent components using Hibernate 3.0. Used Java 8 features like stream and Lambda expressions. Wrote SQL queries, PL/SQL stored procedures and modifications to existing database structure. Developed Scripts for UNIX platform deployment. Used ANT for compilation and building JAR, WAR and EAR files. Used JUnit/Eclipse for the unit testing of various modules. Used JENKINS for CI and deployment. Expert in debugging the issues and resolving the production/test issues. Key Technologies: Java, J2EE, JSP, Web Services,Spring Boot, Spring 3.0,MongoDB, Ajax, Servlet, Oracle, AWS EC2, XML,UML, JUnit, Jenkins, Unix