Keith D Gregory
Senior Technologist: over 30 years of industry experience, with a wide range of languages, platforms, and applications.
May 2018 – present
Wingspan, an IQVIA Company
Blue Bell, PA
Hired to advise and assist with Wingspan's migration of their SaaS product from self-managed data centers to AWS, and post-migration, to guide development teams in their use of cloud-native managed services. Expanded my role to oversee the continuous-build infrastructure.
- Designed and prototyped a video transcoding pipeline based on AWS Batch.
- Introduced the idea of using short-lived EC2 instances running Docker containers for development-phase QA testing, oversaw implementation.
- Introduced the idea of using virtual machines to provide a consistent developer environment.
Java, Scala, SQL (Postgres), Amazon Web Services (multiple)
Jan 2017 – Mar 2018
Lead Software Engineer
Member of the ClubOS development team, working on the company's health club CRM product. Primarily responsible for stability and scaling.
- Designed and built a reporting pipeline, responding to changes in the main OLTP database by updating denormalized reporting tables.
- Extended the reporting pipeline into a general Unified Log implementation that could be used to drive multiple asynchronous services (eg: populating the user search database).
- Introduced the use of generated CloudFormation templates for application deployment, to ensure consistency and minimize configuration.
- Orchestrated the migration of ClubOS infrastructure from EC2-Classic to EC2-VPC. Involved changing the deployments for 100+ EC2 instances and multiple large RDS database servers, with less than an hour total downtime.
Java, SQL (MySQL), Amazon Web Services (multiple)
Feb 2015 – Sep 2016
Senior Software Engineer
Member of RJMetrics' development team, working on the company's data management products.
- Led the design and implementation of the Pipeline back-end, a service for accepting data from large numbers of clients and batching that data into upserts to a client-managed Redshift database. Evaluated technologies and focused the team's efforts (along with writing a lot of code), leading to the product's three-month incept-to-available timeline.
- Redshift query optimization and planning, to support multiple tenants in the company's CloudBI product.
Clojure, SQL (Postgres), Apache Kafka, Amazon Redshift
Jan 2012 – Feb 2015
Fort Washington PA
Member of Chariot's consulting staff, working with client companies to design and build appropriate technology solutions to their business problems.
- A web-based system for managing new client relationships for a multinational law firm. Built using Java, Spring, JQuery, and AngularJS.
- Management systems for the cable industry. Built using Scala, Spring, and OSGi.
- Back-end for a mobile banking application. Built using Node.js, Rails, with relational (Postgres) and no-SQL (MongoDB) databases.
Jul 2010 – Dec 2011
Navteq Traffic Technologies Group
Member of the architecture team, providing design guidance and implementation assistance to the teams developing Navteq's real-time traffic products.
- Designed and built the map compiler framework, which transforms Navteq's base map data into application-specific artifacts. Challenges included large volume of data (over 100MM road segments), ability to migrate to different source databases, performance of source database, and need to regenerate artifacts using varying configurations. Solution used Ant for flexible build scripts, compressed XML for “base” map extract, and a compact in-memory representation of map data.
- Introduced use of location-aware memory-mapped binary artifacts for application data. These artifacts provide high-speed access with reduced impact to the Java heap, and support elastic scalability using hardware with limited memory.
- Initial design/prototype of the Dempsy elastic message processing framework. Based on the “actors” model, Dempsy was created to support (soft) real-time processing of traffic data based on large volumes of consumer GPS data.
Java, memory-mapped files, Hadoop, HBase, S4
Jan 1984 – Jun 2010
(in reverse chronological order)
GSI Commerce, King of Prussia, PA; Senior Software Developer/Tech Lead
Health Market Science, King of Prussia, PA; Senior Softwre Developer
Gestalt LLC, Camden NJ (contract)
Wellfound Technology Inc, Marietta GA; Senior Architect/Consultant
TIBCO Software Inc, InConcert division, Cambridge MA; Senior Architect
Mercator Software, Burlington MA (contract)
Parametric Technology Corp, Waltham MA (contract)
InConcert Inc, Cambridge MA (contract)
Fidelity Investments, Boston MA; Technical Advisor, Manager of Ad Hoc Programming
Symmetrix, Lexington MA; Associate
General Electric Aircraft Engines, Lynn MA (contract)
BBN Communications Corp, Cambridge MA (contract)
Strawberry Software, Watertown MA; Software Engineer
Keithley Instruments Data Acquisition & Control, Boston MA; Software Engineer
THINK Technologies, Lexington MA; Software Engineer
ALB cum laude, 2002; concentration in History
Annotated List of Open-Source Projects
- KDG Commons
- Yet another library of utility classes, in the mold of Apache Commons. Created because I found myself rewriting the same classes over and over, and the adoption delay for submissions to Apache Commons is quite long (although one of my classes did end up there).
- Practical XML
- Utility classes to enhance Java's default XML library. In addition to simple utility methods like “add a child and inherit parent's namespace,” provides a nice XPath wrapper and a library to convert between XML and a variety of other formats.
- Extensions to Apache Commons BCEL. At the present time, this is focused on supporting annotations.
- A tool for examining Java Web Applications to discover their URLs. Supports Spring 2, Spring 3 (annotation-driven), and basic servlets and JSPs.
- A set of tools for examining and cleaning Maven POM files. See also the series of blog posts that I wrote in July and August of 2012 about was to simplify Maven projects.
- Appenders for Log4J that support writing to multiple AWS destinations. Provides an alternative to Logstash or the Amazon logging agents, particularly when feeding the logs into ElasticSearch.
Author: Programming with Motif; Springer-Verlag, 1992
Co-author: Complete Turbo-C; Scott, Foresman, 1989
Presenter, Philadelphia Java Users Group:
- June 14, 2018: Building a Logging Pipeline in AWS (slides)
- May 17, 2017: Serverless Applications in Java (slides)
- March 26, 2014: JVM Internals (slides)
- November 14, 2012: Taming Maven (slides)
- November 9, 2010: Byte Buffers and Off-heap Memory (slides)
- October 14, 2009: Code Coverage (slides)
- December 12, 2007: Java Reference Objects (slides)
Presenter, Greater Philadelphia AWS User Group:
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