● Designed and Implemented a fraud detection system with Feedzai products and delivered Feedzai solutions to clients.

● Implemented a socket-based message router system between client endpoint and Feedzai system to transfer the messages to the right Feedzai solution cluster.

● Designed and implemented several custom servers in Feedzai solution to handle and process the messages for fraud detection.

● Designed and implemented an email system to send HTML emails with pdf/excel attachments.

● Added new features to the Feedzai internal async-server library to support generic response body and allow the downloadable link.

● Preformed and implemented performance tests with the client and tuned the Feedzai solution to handle 200 trans/sec.

● Designed and implemented auto deployment scripts using Ansible and Shell and deployed Feedzai solution to clients’ server.

● Used Javascript/HTML/CSS to accomplish the clients’ front-end UI requirements.

Collaborated with the client’s teams to discuss the requirements and explain the solutions to them.

● Techniques: Rabbitmq, Zookeeper, Cassandra, Ansible, Jetty Server, MS SQL Server, Google Guava, Socket, REST, Multi-Thread, Maven, Docker, EasyMock, PowerMock.

● Primary designer of a team collaboration system in Android and IOS platform.

Back End:

● Used Cassandra to support user chatting, pub/sub topics, participating events/sessions and sharing info in organizational structure.

● Designed and implemented a back-end RESTful service to handle user registration, publishing topics and surveys, processing uploaded data, sending emails automatically, pushing notification using Spring Boot framework, Google Guava asynchronous library and Cassandra Datastax.

● Used socket.io and nodeJS express framework to implement a back-end web socket server for real-time communication and cross-server communication.

● Used Redis to improve the access performance of users' information updates.

● Designed and implemented an importing system for enterprises to upload the initial user and organization data to the back-end server.

● Used Nginx for load balancing and wrote some scripts to load several test data from different format to perform integration tests for various components and chatting system.

Front End:

● Designed and implemented front-end real-time communication channel for text, voice, image, and video communication(React Native, Redux).

● Used AsyncStorage database to store the offline data on the front-end phone app.

● Techniques: Spring Boot, Socket.IO, ReactJS, React Native, React AsyncStorage, Redux, Apache Tomcat,

Cassandra, Redis, Google Guava Asynchronous Library, Nginx, NodeJS, Express, JSON, JUnit.

● Provided database support to major telecom clients in China such as China Mobile and China Telecom with billions of users

● Implemented APIs for data upload/download and designed rules for data access control (SQL, Java)

● Tested the FTP of the China Telecom group and its 31 subsidiaries and communicated with individual provinces to upload the data