• Built many parts of the real-time rule engine and back-end service used for AB Testing / Experimentation• Built all levels of the metadata service and ETL for scheduling, configuring, and querying experiments• Created several parts of the internal application UI used for configuring experiments• Worked with Product Managers to ensure experiment data is visible, useful, categorized, and queryable• Worked closely with Data Scientists to implement population variance reduction techniques• Collaborated with Data Engineers on how to ingest, interpret, and model experiments• Built the internal tool used by QA, Engineering, and Customer Support to view and edit customer detailsTechnologies: Cassandra, Redis, Dynomite, MySQL, Teradata, EVCache, Hive, Presto, Tomcat, Java, JUnit, Python, AWS, SQS, EC2, S3, Spark, Scala, Elasticsearch, JavaScript, React, Redux, NodeJS, Git, Stash

• Helped with the ad delivery infrastructure by leading security, performance, stability, and tracking projects• Conceived and built eBay’s patented Secure Expandable Ads Framework

Worked together with platform engineers to build an innovative Java-based presentation framework• Developed ways to give internal Java tools full control of browsers, without using Applets• Developed a tool to allow updates of eBay’s internationalized text repository directly on web pages• Wrote IDE plugins for searching code, object models, and a patented way to translate Java to CSSTechnologies: Oracle, MySQL, Java, Hive, PL/SQL, PERL, C, C++, OSGI, Flash, JavaScript, GWT, HTTPUnit, HTMLUnit, Selenium

Conceived, designed, and implemented numerous internal-use database tools• eBay’s test data creation system, heavily used by QA, Engineering, and Customer Support• Patented system to extract, manipulate, compare, and synchronize across database replicas• Tools used to reverse-engineer complex database transactions

Worked in a team of Quality Engineers to build eBay’s early automated web application testing systems• System to record back-box testing, turn actions into an automated test suite, then play tests back using multiple browsers, capture results, and automatically find and report differences• Tools that used a learning algorithm to replace manual testing of item catalog internationalization• Developed a patented algorithm for measuring above-the-fold page render time

Black and white box testing of the early Internationalized eBay sites, View and Sell Item pages, Feedback, Categories, and Attributes pages

• Tested several areas of EcoSCOPE, a network traffic analyzer• Wrote software to automate EcoSCOPE installation on all machines in the computer lab

• Created web pages, graphics for, and maintained the Patent Legal Team’s web site• Fixed hardware-related problems with co-workers’ computers and in the lab