* Developed new code for Apache OpenJPA including portions of the JPA 2.0 and 1.0 specification. * Reviewed patches provided by OpenJPA committee.* Evaluated and promoted new committers to the project. * Release manager and branch maintainer for OpenJPA versions 1.0.x and 1.2.x.

* Led team responsible for Rate Shopping and Carrier Data Management for orders from Target.com * The rate shopping system handled up to 95% of digital sales from Target.com during Black Friday - Cyber Monday weekend 2018 with no downtime * Delivered $12,300,000 in savings in the first year of operation * Managed data and performed rate shopping for 1800 locations across four major carriers* Migrated deployment environment from OpenStack Virtual Machines to containers running in Kubernetes* Led the team that designed, developed and deployed a new promotional event forecasting application. * Wrote Scala programs using Apache Spark to perform ETL operations from Apache Hive databases on Hadoop to Cassandra. * Designed REST APIs to read from Cassandra using Ratpack. * Developed CI/CD framework for deploying Ratpack and Node JS applications in OpenStack using Chef and Jenkins.* Developed OAuth 2 authentication support for a homegrown Express JS application. * Led team responsible for unified inventory management application running on ExpressJS with Angular.

Full stack developer for Enterprise Forecasting applications responsible for the entire application lifecycle (cradle to grave).* Developed Spark ETL jobs to store forecasting information* Built and maintained Chef based deployment pipeline for Enterprise Forecasting Applications* Wrote Ratpack REST API to provide demand forecast data to in house inventory management user interface.

* Designed three tier application to re-score high stakes exams using RESTful APIs, AngularJS, Spring MVC and Tomcat.* Led team of developers responsible for enhancing implementing features and maintaining web applications in Java.* Advocated and led adoption of Git version control for new projects and acted as subject matter expert on migration for existing projects.* Extended and developed new Puppet scripts and implemented custom Ruby gems to provide a continuous delivery pipeline for Java servlet based web applications.* Redesigned the Question and Test Interoperability compiler application for more efficient resource usage and easier extensibility.* Enhanced a Swing test delivery application for use with assistive technology screen readers.

* Developed new stored procedures using TSQL to improve ingestion of medical images from other medical institutions.* Refactored existing stored procedures to improve performance and maintainability.* Worked with vendors to support a proprietary JEE image archive management application.* Improved monitoring capability for existing applications by developing custom Cron jobs and shell scripts.

* Designed and developed new features for JEE components in WebSphere Application Server. * Provided on site customer support for high-profile WebSphere Application Server customers, including bug fixes and custom software patches for their specific needs.* Introduced continuous integration into our development process using JetBrains TeamCity.* Subject matter expert for Apache Maven build system. * Provided low level design and implementation for Java Specifications (JSR) used in WebSphere Application Server. JSRs contributed to include: * Java Persistence API (JPA) * Java EE Connector Architecture (JCA) * Java Database Connectivity API (JDBC) * Diagnosed and resolved performance bottlenecks in WebSphere Application Server - primarily relating to database access, connection pooling and the JPA programming model. * Active Apache OpenJPA committer and Project Management Committee member. * Release manager for Apache OpenJPA 1.0 and 1.2.* Mentored a team of developers in becoming open source contributors and helped establish guidelines for leveraging Open Source Software in WebSphere Application Server.* Conducted source code pedigree reviews to ensure code contributed to Open Source projects does not violate patents.* Reviewed test plans for load and function test teams.* Worked with Fortune 500 customers to resolve application design problems and adopt best practices for JEE applications.* Developed utility programs in support of early access feature packs for new JEE specifications.

Developed new workloads testcases for iSeries (AS/400).Ensured Y2K compliance for lab systems.

Developed automated workloads testing framework for IBM iSeries (formerly AS/400) using Mercury Interactive WinRunner and Loadrunner.Developed new workloads testcases using WinRunner and LoadRunner. Maintained workloads testing systems on AIX and OS/400.