The Tuya MQTT Broker provides massive (over 100M connections) online long-term MQTT connectivity and message distribution capabilities to IoT devices and user terminals worldwide. The system's main technology stack is Erlang.During the in-service period, I was mainly involved in improving the MQTT broker architecture and the entire development process, which significantly improved the online system's stability, observability, and maintainability.Introduced modern observability architecture, CI/CD for the team; introduced Rust (FFI) based NIF extensions for Erlang; improved the service registration and discovery mechanism based on etcd or other backends; fixed the etcd deployment and maintenance scenarios; and fixed and improved the Kafka based messaging scenarios; etc.At the same time, I develop various specifications, processes, and standards and output a large amount of documentation.Investigated and participated in the design of an eBPF-based network packet filtering and SYN flood protection system.I also contributed some PRs to the open-source community, such as Erlang libraries and Rust libraries.In addition, I have provided many consultant suggestions and architectural upgrades for the cloud department to improve its efficiency, such as improving the massive log indexing system and upgrading observability assurance (monitoring, alarming).

As a member of the early technical founding team of UPYUN and its predecessors, I returned to the team and participated in the core architecture development of container cloud-related services, and was hired by the CTO Office to provide company-level technical and architectural consulting.During this period, I was mainly involved in the [Holdcloud](https://www.holdcloud.com) project, a K8s-based container cloud project, and led the selection, design and development of its CI components.

Back to Huaban to help.One of the founders of the company, Senior software engineer, system architect, full-stack developer, kind of consultant.Optimize/ fully upgrade the server-side service structures, including web services, DB/caches, message middlewares, front-end structure, backend services, online/offline data analytics, searching serveices and business logics.Establish a standard development workflow, including development specifications, CI/CD working flows.Develop scalable DB accessing layer/services/components.WIP

Consultant for software engineering services around live streaming server development. Participated in the development of a full-functions live streaming/re-streaming server in Rust language.

One of the founders of the company's predecessor, participated in the basic/core service(distributed storage system) of the company.Participated in a large number of log collection and analysis work, and established a streaming data processing platform.Maintain Flink, Hadoop, ES and other data analysis platforms and Kafka messaging middleware clusters.Designing and developing an RTMP server and live streaming delivery network from scratch in Rust language and side services.

Set up the company's development team, plan and build the company's website / service infrastructure, and implement technical training.

Uber Driver for fun :)The tool stack: My car, iPhone, Uber driver's client & me

Core programmer at Huaban, one of the founders of the company. Lead the dev team, develop huaban web site front-end and back-end apps/services. Working on Node.js/Javascript, PHP, Python, Erlang, Elixir, Redis, MySQL, Solr and more.

Core programmer at Yupoo. I was joined in the early of the company. Took part in the yupoo.com and its related back-end services. I also take part in UPYUN cloud storage service development. At the Deccember of 2011, we set up a new project and start up a new company, call Huaban.com.The tool stack: PHP, memcache, Redis, MySQL, Erlang , Python, Java, front-end, , etc.