Personal Info

Name: Donglin Yang (杨东霖）

Education: University of Regina, 2010 - 2013 (Electronic Engineering) (dropped out)

Github: https://github.com/Krysme

Skill Set:

• Experience with Rust , C++, and some light experience with wonderful languages like Clojure, Typescript etc.
• Familiarity with the GNU/Linux Operating System (I use Arch for my own desktop).
• Some encounter of GPU programming, CUDA specifically, from a crypto mining project.
• I'm also a fast learner of new technologies.

Recent Projects involved

A Proprietary Fork for the Filecoin Node

lotus is the official node implementation for filecoin with a sub-optimal mining efficiency. So I forked it's rust library to have some of my own optimizations to provide a proprietary grade mining service for the clients of my employer. My own implementation of lotus has a clear advantage on both time and memory usage, especially when it comes to the execution time of the zk-snark proving algorithm of filecoin.

Personal Contract Project

An proprietary system for automatic plant watering, running rust code on ARM linux, communicating with the server with the MQTT protocol. This projcet involves interacting with an MQTT C library, since we don't have a matured one in the rust eco-system yet. It basically receives watering schedule or one-shot operation from the server and takes action.

Hobby Project (Almost finished)

https://github.com/Krysme/greater-fire

A re-write attempt for trojan. With rust's async & await, I believe that the implementation of trojan can be simplified in a great scale. The original trojan is implemented in C++ with boost::asio.Since C++ does not have coroutines yet (at least not before C++ 20 gets widely adopted), it has to be implemented with callbacks and state-machines. And I believe it is possible to be re-written in rust in less than 1000 lines of code. Through this project I'm more familiar with the new async-await feature.

Misc

Also, I've answered some 知乎 questions， and here are the link of answers which might reflect some of my understanding of rust and C++.

知乎

Working Experience

System Engineer 2014.8 - 2015.7 (广西支付通商务服务有限公司）

Abstract

We have a payment processing system running in clustered redhat linux, with nginx (as the reverse proxy) & tomcat and the database is IBM DB2.

Job Description

• Responsible for the maintainance job of the backend of the payment system.
• Trouble shooting and assisting the main developers.
• System administration.

C++ Junior Developer 2015.7 - 2016.2 (上海新跃物流企业管理有限公司）

Abstract

In this job, I'm responsible for the client application of a voip calling system developed with WxWidget. The app interacts with the server to make/transfer calls and log customer complains.

Job Description

• Client side software development & bug fixing.
• Communication with other department for feature requests.
• Trouble shooting for server side software deployment.

Technical Leader 2016.2 - 2017.11 (上海慎独信息科技有限公司）

Abstract

This is a startup company with less than 10 employees, and my role was the tech lead for the development of our software products which help our manufacturing bussiness clients monitor and improve the efficiency of their employees.

Technical Details

The software are designed to have a client - server architecture. The client is built with Qt and boost, and we have a server written in javascript with the node.js runtime.

Job Description

• Architecture design for all products.
• Technical training for new members.
• Communication with clients and other departments for feature requests.
• Team management and leadership

Principal Engineer 2017.11 - 2020.5 (STAr Technologies(Wuhan))

Abstract

STAr Technologies develops semi-conductor testing solutions and probe cards, and the department I lead is in charge of the Sagittarius product series. This link demostrates detailed information about this series of products.

Technical Details

Sagittarius is a multi-process solution which uses IPC exclusively. A fraction of it is written in rust, but mostly in C++.

Job Description

• Project management.
• Architecture design.
• Periodical training & skill sharing.
• Communication with clients and other departments for specification of the software.
• Team management and leadership
• Communication with India branch (in English) for cooperation and job distribution for both Wuhan & India branch.

Rust Developer (星际无限/神算云科技)2020.9 - 2022.11

Abstract

I'm the only rust developer in this company, and involved with anything related to system programming including:

1. Crypto mining software optimization (mainly).
2. Bug fixing and stability improvement for the mining operation.
3. Developing a crypto wallet which interfaces with the hardware.

Technical Details

The optimized version of the mining software takes advantage of:

1. Implementing a better implemented zk-snark scheme,
2. Offloading some of the highly parallelized tasks to the GPU,
3. Take advantage of the hardware's topology by having a better CPU affinity setup, and
4. Use multi-threaded computation for CPU tasks to make use of the server CPUs as much as possible.

Rust Developer (北醌云超算) 2022.12 - now

Abstract

I'm in charge of a remote desktop project for client to operate on the cloud computers. Rsponsibilities including:

1. The backend implementation of the software.
2. Optimization for a lower latency and less CPU/Memory usage.
3. Find inspirations by investigating similar open source solutions (like RustDesk).

Technical Details

This project takes the advantage of WebRTC to stream video feed from the cloud to the client side in real time. and perform mouse/keyboard operations sent by the user. The backend is written in rust mainly, with some FFI with C libraries like ffmpeg. The frontend is an electron based app for current version. A more performant rendering schem (like directly render image buffers with wgpu) might be used in future releases.