alex ziheng

* Improved Wego's infrastructure by tinkering with its distributed systems. * Languages: Bash, Golang, Ruby. * Tech stack: AWS EC2, Chef, Consul, Docker, HAProxy, Heka, Jenkins, Kafka, Marathon, Mesos, Zookeeper. * Wrote Chef recipes to automate infrastructure configuration. * Developed a CI & CD pipeline using Jenkins to enable automatic deployments. * Developed a container orchestration platform for staging environments using Marathon, Mesos and Docker. * Implemented service discovery for the aforementioned platform using HAProxy and Ruby. * Set up & maintained on-premise Docker registry which sped up Docker pushes & pulls by 5X. * Developed a proof-of-concept for distributed configuration management using Consul. * Integrated Kafka as a message broker to make data pipelines fault-resilient. * Developed & open-sourced a Heka plugin written in Go to persist data from Kafka to Amazon S3.

* Made internal tools and worked on a project for Samsung APAC. * Languages: JavaScript, Ruby. * Tech stack: Angular.js, Rails, Amazon DynamoDB. * Mainly worked on internal tools, such as employee portal, project management tool, and employee time tracker using Angular.js with Rails. * Developed a scalable NoSQL message service API using Amazon DynamoDB for a client’s project (Samsung APAC). * Migrated company's internal database to Google Compute Engine. * Maintained the backend infrastructure of the company's in-house apps.

Automated manual labor components to enable better operations. Language(s): Python. Tech stack: Airflow, Google Vision API, OpenCV, Tesseract. - Researched and developed a prototype to extract structured data from receipts using OpenCV and Tesseract, achieving over 90% accuracy on in-sample dataset. - Built & shipped a production-ready image processing pipeline by integrating the prototype with Google Vision API, speeding up order reconciliations by 3X and potentially saving thousands of dollars in operating costs per month.

* Rebuilt the product across the full stack. Languages: JavaScript (ECMAScript 6), Ruby, Swift. Tech stack: React + Redux, Rails, Xcode. * Rebuilt various parts of the product with HTML5, CSS3, ES6 using React and Redux. * Built & shipped the entire chat SPA (http://www.2redbeans.com/en/app/chat) using AJAX & socket.io to allow real-time updates, with responsive design across desktop and mobile platforms, shaving off response times by 80%. * Rewrote legacy Rails API for new chat SPA to handle the shift of business logic to front-end, shrinking Rails codebase by 40%. * Developed features for iOS app using Swift and Xcode. * Standardized coding style of the front-end team using style guides.

NUS Overseas College (Silicon Valley) programme. Took classes in entrepreneurship and wrote a compiler for an object-oriented language.

Exchange programme. Took 7 courses in one semester. Top ranked in Information Retrieval course for a full-text search engine implementation, based on speed and accuracy of queries. A+ for Principles of Programming Languages.