As a Back End Developer, My work generally uses Ruby on Rails framework as a web and mobile API service.- Use Ruby on Rails to develop back end service for teacher web app, and create API for support several mobile app feature.- Responsible to design relational database mapping for both web app and mobile app.- Responsible to communicate and integrate with front end (create API blueprint).- Use Kafka as a distributed system and queue. - Use Couchbase and MongoDB as document storage- Use Firebase as a third party service to support notification in web app and mobile app.

My responsibility as R&D in telecommunication smart card, include:- Develop application to check file specifications in telco smart cards compared to standard specifications related to GSM 11.11 (SIM Card) and ETSI TS 131.102 (USIM Card).- Modify and maintain application to convert script perso generator related to telco smart card specification.- Modify and maintain core test application.- Responsible to conduct test plan from core test (software) and online test (test in phone handset) to ensure that the telco smart card has been worked in accordance with required specification from 3GPP or ETSI organization.