The KaiCloud is a microservice system, it contains various applications, each service vai queue to communicate and share the data. - KaiStore backend Marketplace for the world's most popular apps on KaiOS. A Microservice application, this project is based on the GoLang for device facing API, and JAVA as DAO framework talks with Cassandra database - KaiStore Portal backend A system allows developers/partners to upload apps and manage app versions, manifests, and configurations. - KaiAds (Ad Exchange, SSP, DSP) The KaiOS AD system, kaiOS's developer, via KaiAds SDK sends ad-requests to SSP servers to bid the ADs from several DSP partners. This product is a pure Golang project. We use AWS Elasticache to store the AD data to increase the latency and use Lambda to sync the cache data to the database.

ETL & exception management system A data pipeline system, daily to sync data from the data center, it uses a queue to keep the data alive, using the Producer/Consumer architecture, the process can easy to scale up. Manufacturing Monitoring System A system monitoring the data from the manufacturer, this system can deploy in the cloud and at the local device.

POS System Responsible for POS System of FamilyMart which was implemented in the C#/.NET Windows Form. The system provided typical POS features, and I developed new features including the ability to handle TCP/IP connection loss, or exhausting inventory.