Improving systems and improving people is a concise summary of my work at Stripe. Extending existing system with new functionality while making them easier to use and maintain was my "official" work. Improving people through one-on-one mentoring of junior engineers with a focus on navigating the process that emerges at large software companies was my "unofficial" role; there are a few developers who I still meet with on a regular basis.* Added support for grouping multiple accounts into Organizations, and developed a security model for sharing users and other resources among accounts within an Organization* Enabled search to work across all accounts within an Organization* Expanded the Know Your Customer (KYC) system used to collect personal information for user verification * Developed and deployed an architecture for triggering data collection based on events (account limits, time limits, binary values) * Augmented the event framework to work with long-term events that can trigger years into the future

Grew the search team - through internal mentoring and external hiring - to a group of seven spread across three functional areas. Designed the search architecture, and implemented a system for zero-downtime upgrades, idempotent indexing, and a flexible query language.* Delivered an ambitious upgrade to our search system by coordinating three functional teams (UI, service, hardware)* Developed a query language that enabled internal teams to efficiently find data for spam and abuse prevention* Enabled our data science teams to develop new features through efficient access to source code search* Solved several scaling issues allowing increased throughput to our search clusters and providing greater query access to the end user* Served as Boulder office manager for three years: point of contact for building management, planning monthly lunches and events, coordinating with teams visiting Boulder for on-site meetings

At this publisher oriented startup, I developed tools to on-board new publishers by crawling their back catalogue of publications and integrating that catalogue into LinkSmart's dynamic article linking system.* Automated publisher on-boarding process enabling new customers to be up and running in a day instead of a week* Implemented a relevance system to find pertinent articles for dynamic link insertion improving client click-through rates* Reduced service creation time from several hours to several minutes via Puppet infrastructure automation

Designed and developed a distributed computing framework, with accompanying web application, for ingesting weather forecast and observation data and computing verification statistics.* Reduced the time for weather verifications to be made available by an order of magnitude: 24 hours down to an hour* Created a map-based web application for displaying weather forecasts overlaid with weather verification statistics* Took ownership of operational tools such as the Jenkins continuous integration server, git server, deployment scripts, and server management scripts

Developed a new text categorization system based on a combination of latent semantic analysis processing, boolean queries, and related text metrics. Brought this application from research and design into a fast, scalable production system.* Improved accuracy of semantic analysis by developing a Ragel parser/tokenzier to process documents* Incorporated the parser/tokenizer into a new text categorization engine which improved throughput and reduced errors* Created a very easy to use HTTP proxy framework for communicating with back-end services

Designed and developed several software systems used for testing and validating spacecraft hardware and software. These systems include real-time simulation, closed loop control, and post-analysis software.* Developed a cross-platform unit testing framework in C++ for use with the VxWorks real-time operating system (later adopted as the standard unit testing library at Ball)* Led a small team of developers in the design and creation of a web application for storing digital “items” and discovering items based on tags and trust relationships* Created a closed-loop control tool to correct thermal motions in an optical testing and verification system* Created a post-analysis tool to validate the image processing and compression of a spacecraft avionics box* Built an image generation tool to provide input data to a spacecraft avionics box during testing and validation

Designed and implemented the architecture for a client/server security system using GPS satellite data as authentication tokens.* Refactored the system framework into a modular, multi-tier, message-based architecture which served to increase system flexibility and decouple software components* Created a thin-client monitoring program capable of streaming itself via Java RMI from a remote server and displaying on a local client machine* Developed an extensible architecture for communicating with GPS receivers via RS-232* Implemented a Java keystore (conforming to the KeyStoreSpi) using JDBC to manage PKI keypairs in an SQL database

Managed a three person development team through the design and creation of a distributed satellite data processing system.* Designed a JNI architecture for easy integration of legacy data processing algorithms* Developed a Java daemon for running and monitoring native algorithms and for distributing processing load across networked computing resources* Created a network communications layer with swappable transport protocol (RMI, CORBA)

Maintained and developed the Advanced Real-time Gaming Universal Simulator (ARGUS), a missile defense simulation project, at the Joint National Test Facility, Shriever AFB.* Extended ARGUS capabilities by creating new battle management logic* Designed and implemented a new missile interceptor propagation algorithm* Implemented a new memory allocation debugging tool