Software engineer and technical lead at Twitter. I am proud to help build and scale infrastructure that can reach everyone on the planet including Embedded Timelines, Embedded Tweets, Twitter Headlines, and Tweet Button. They are now seen by billions of eyeballs every day. Graduate from University of California, Berkeley in Computer Science and Economics. I also have a M.S. in Software Engineer from Carnegie Mellon University. In my previous lives, I was a freelancer, software engineer, and QA engineer under corporate environment. I specialize in creating highly-scalable, rich web applications end to end. Skills range from architecture design, database, back-end application logic, and UI. My focus is on problem solving and knows no boundaries. I am super passionate about transforming cutting-edge technology into solutions that people can't imagine living without. Specialties: Ruby, Ruby on Rails, Scala, Java, Android, MongoDB, HTML, CSS, JavaScript, jQuery, RESTful API, MySQL, Unix, Git, Agile, Technical Leadership, Open Source, Test-driven Development, Test Automation, System Administration, Scalability, Continuous Integration

Senior Software Engineer @ Backend technical lead on Syndication (formerly Twitter for Websites) From July 2013 to Present (2 years 4 months) San Francisco Bay AreaSoftware Engineer @ Help scale infrastructure to support millions of people around the world! - Helped with decentralization and migration efforts off of one of the biggest Ruby on Rails stacks on the planet (Monorail) - Zero-downtime Thrift library upgrade in Monorail for core application services - On-call rotation during heavy peaks e.g. Olympics for Monorail - Part of the founding Syndication team responsible for designing and building the new generation of Twitter for Websites product from grounds up: Embedded Timelines and Embedded Tweets - Core contributor to Syndication platform, implementing various features such as server-side rendering, caching (CDN, Memcache), and data models, business logic, and storage (Scala, Finagle, Thrift, Cassandra, Mesos) - Backend technical lead on Syndication responsible for owning, tuning, and scaling services that peak at 10.5M+ requests/min while maintaining 99.99%+ SLA - Infrastructure managed grew from 20 to 250+ shards across existing and new services - Lead on re-architecting and migrating all Syndication services from bare metal in one datacenter to multi-DC, bi-directionally replicated, internal cloud platform (Mesos, Cassandra) - Implemented internationalization (I18N) support for Embedded Tweets and Embedded Timelines - Implemented deploy scripts (Ruby) for interacting with Jenkins CI and Git to do hundreds of deploys to Mesos and Packer across all Syndication services - Backend technical lead for Embedded Timelines, Embedded Tweets, Tweetbutton, oEmbed API, Twitter Headlines - Optimized Headlines backend performance by 10X through refactoring and JVM tuning - Lead on designing and implementing automated Headline verification feature via URL crawling and Storify integration for Twitter Headlines - Migration from Maven to Pants build tools - Helped grow the Syndication team from 4 engineers to 8 while establishing on-call rotations - Mentor to intern and new engineers on the team From March 2012 to July 2013 (1 year 5 months) San Francisco Bay AreaSoftware Engineer @ - Member of backend engineering team focusing on scalability of Ruby on Rails stack - Lead engineer in re-architecting asset hosting service leveraging Amazon S3 to provide 100X in performance - Lead engineer in re-architecting user subscription emails system to provide transparent end-to-end tracking with MongoDB - Core contributor to user export tool to help users migrate off the platform during sunsetting - Maintenance of software stack post-acquisition From October 2011 to April 2013 (1 year 7 months) San Francisco Bay AreaSenior Software Engineer @ Technical lead for Intuit Community, back-end engineer for next-gen platform, and member of technical staff for LoveALocalBusiness.com From August 2011 to October 2011 (3 months) Menlo Park, CASoftware Engineer @ - Lead engineer on numerous user facing features for Community.intuit.com and LoveALocalbusiness.intuit.com (Ruby on Rails, HTML, CSS, jQuery) - Love A Local Business featured as 1 of 8 funding contests for big ideas on Mashable ( 09/2010 ) - Designed and implemented caching strategies that withstood 350+ million requests/week during tax season - Led continuous deployment efforts as we moved away from hours of release call to zero down time deployment - Spearheaded adoption of NoSQL solutions for scalability (MongoDB) - Presented technical presentations to rest of engineering staff on MongoDB and Map/Reduce - Experience in system administrator role tasked with keeping production site up 24/7 Designed and implemented first iteration of RESTful API for Community - Key contributor to 3 data center migrations, including 2 with high availability setups. Work included cross data center deployment recipes, data store replication, load testing, and server setup - MySQL real-time replication for offline analytics - Lead engineer in design and implementation of real-time user gaming system to incentivize engagement on Community that is similar to Badgeville and Foursquare - Lead engineer in site activity feed leveraging NoSQL storage (MongoDB), 60+ million requests/week. Deliverable resulted in 300% improvement in time to first response within 15 minutes in the first 2 months - Implemented database models, location-aware suggestion algorithm, caching strategies, front-end, integration with Facebook and Twitter for LoveaLocalBusiness.Intuit.com - Overhauled old deployment system to be fully automated. Spearheaded continuous deployment efforts resulting in elimination of release calls and downtime. Deployment time decreased from 2 hours to 2 minutes. Same system is being used to deploy over 3,000 times in staging - Lead engineer on new Intuit Small Business Blog built on Wordpress From November 2008 to August 2011 (2 years 10 months) Menlo Park, CAQA Software Engineer Intern @ Internship with Intuit's Quickbooks QA team. Projects: - Researched various mocking libraries for whitebox testing. Presented results to engineering community. - Co-authored web-based dynamic SQL query tool. Designed and implemented UI in HTML, CSS, and Javascript From June 2008 to August 2008 (3 months) Software Engineer Intern @ Intuit Quicken Health Group From June 2007 to August 2007 (3 months)

Master of Science, Software Engineering @ Carnegie Mellon University From 2010 to 2012 B.A., Computer Science, Economics @ University of California, Berkeley From 2004 to 2008 Kang Chen is skilled in: Ruby, Ruby on Rails, MongoDB, HTML, CSS, JavaScript, jQuery, AJAX, MySQL, Sinatra, Mac OS X, Unix, Git, Scrum, Agile, Technical Leadership, Open Source, TDD, Test Automation, Memcached, System Administration, Scalability, REST, Continuous Integration, Agile Methodologies, Java, Test Driven Development, Databases, JSON, Web Applications