* Rewrote client's Natural Language Processing system for Voluntary Carbon trading, adding over 1000 test cases, more than doubling the speed of typical queries, adding the ability to answer multiple subquestions at once

* Added a microservice to ingest multi-gigabyte ZIP files

* Handled all technical aspects of creating a new video events platform that can run events with over 300 participants at once* Worked with three cofounders in Australia on business, landing a first customer running multiple events per week often with hundreds of guests

Aug 2018 - Mar 2019: SWE on Go Cloud team* Designed, implemented and released (Jan 2 2019) a portable pubsub API. Design: https://bit.ly/2R7ZmnG. Code: https://bit.ly/2s99Nsf* Streamlined developer experience around testingApril 4, 2016-July 31, 2018: SWE on App Engine Runtimes team* Launched php72 runtime beta https://news.ycombinator.com/item?id=17810591* Lauched php72 alpha in Jan 2018* Automated build for php55 runtime

* Sped up key textmining operations such as deduplication by thousands of times by making better use of the Postgres database, enabling updates of the whole site* Added automated reports on data structuring quality* Added automated tests for the textmining daemon and event handling daemon* Stripped away complexity in the textmining daemon while improving its performance from multiple seconds per video to 50 msec per video

* Designed a dependency tracking system for denormalized view generation* Added atomic updating of sharded tables in our data warehouse* Created dashboard elements to display company performance metrics* Added an internal system to periodically evaluate comment spam filter performance with a team of reviewers* Created an internal dashboard to monitor abuse metrics* Wrote a suite of sawzall scripts for abuse detection* Added a feature to neutralize mass-produced spam accounts without alerting the spam farmers who make them* Converted comment pagination to a Twitter-style Show More button on the video watch page* Brought back pagination on the View All Comments page after it was broken by a database migration* Implemented a feature that combats brute-force password attacks* Added a comment bleeper for watch page comments* Eliminated YouTube's problem with chain comments* Added filters for comment spam and personal message spam

* Developed a new phone verification system with a failure rate less than one quarter of the legacy system it replaced* Developed a new GWT-based UI for spam investigations* Fought spam in the Google AdSense network by analyzing traffic on publisher sites

* Wrote a desktop client application to view brain cross sections together as stacks in 3D. It can be downloaded here: http://brainmaps.org/index.php?p=desktop-apps-stackvis* Developed an algorithm to compute probabilities of connections between pairs of brain areas from sparse experimental data* Wrote a pair of Mac applications to align and unwarp images for 3D reconstruction

* Developed programs on the Windows desktop and code within a Playstation game to improve rendering efficiency for 3D models

* Wrote a 2D vector field editor with feature detection, using complex polynomials and stereographic projection* Wrote a Clifford algebra calculator in Python

* Investigated an edge-collapse algorithm for simplifying tetrahedral meshes with associated scalar fields