Responsible for the development and maintenance of backend services, websites and POS terminal application. Role encompasses every phase of software development life cycle.• Develop and manage Spring framework Java backend services. Utilize Spring framework modules/features including Spring MVC, Spring Data, Spring AOP, Spring Security and Spring Boot. Integrate with MS SQL Server or MongoDB for different projects- Design and implement data models for given business, create controllers for business logic, utilize Hibernate for database connectivity- Construct e-commerce payment module to integrate with North America Bankcard- Create various reports including sales, payroll and inventory control using Jasper Reports- Conduct project migration for instance Java 6 to Java 8, and Spring Boot 1.5 to Spring Boot 2.1- Create unit test cases using JUnit• Implement and maintain online ordering and CRM websites written in ReactJS- Build service modules which integrate with Java backend using Redux- Optimize web application performance by analyzing the API call usage and utilizing tools such as Lighthouse - Integrate with Firebase for order placement to POS system- Resolve UI issues across different devices and browsers using Bootstrap and React Bootstrap• Assist design and implementation of Android POS solution- Build service modules which integrate with Java backend service- Implement administration modules such as organization, employee, and menu management- Assist with abstraction of reusable modules• Maintain multiple legacy websites written in ASP.NET and C#- Implement a central menu management module using ASP.NET Web Forms- Assist on bug fixes• Maintain legacy POS solution written in VB6- Implement new reports which integrate with Crystal Reports 9- Assist on bug fixes• Conduct project deployment and maintenance on AWS EC2 Linux and Windows instances

• Tested applications (such as Facebook, Twitter and Email) based upon USSD with cellphone simulator on both the functionality and user interface design.• Debugged billing system of applications, and developed database queries to check correctness of subscription actions and analyze rationality of different subscriptions.• Examined both functionality and design of web-based subscription system.• Installed product updates on server with PuTTY and FileZilla, modified configurations for each update.• Designed, modified, and executed test cases, reported incidents.• Created documentation for all test cases.• Collaborated with both Chinese and French R&D teams to analyze and troubleshoot bugs.• Conducted intern training as a tutor of QA department.