Keith D Gregory


Senior Technologist: over 30 years of industry experience, with a wide range of languages, platforms, and applications.


Jan 2017 – present


Philadelphia, PA

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.
  • Introduced the use of generated CloudFormation scripts for application deployment, with simplified and consistent 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, while minimizing downtime.

Java, SQL (MySQL), Amazon Web Services

Feb 2015 – Sep 2016


Philadelphia, PA

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

Chariot Solutions

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 multination 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.

Java, JavaScript, Ruby, Scala, Node.JS, Rails, Spring, AngularJS, JQuery, JQuery-UI

Jul 2010 – Dec 2011

Navteq Traffic Technologies Group

Malvern PA

Senior Architect

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

Jul 2009 – Jun 2010


Developed a product list service for eCommerce sites, allowing multiple users to share a single list for "collaborative shopping." A unique feature was its use of encrypted tokens containing the information needed to access the list, access permissions for a particular user, and a time limit. This enabled the list to be managed directly from the browser, without the need to log into a user's account.

Enhanced the Practical XML open-source library, adding conversions between XML, JSON, and bean-style Java classes.

Developed a queue benchmark for the Navteq Traffic Technology Group. This benchmark was designed to support multiple queue providers from with a core load generator that could be easily configured to test different consumer/producer/broker scenarios. To run the benchmarks, I used ad hoc clusters of Amazon EC2 instances, to match Navteq's heavily-virtualized data centers.

Java, HTML, JavaScript, JSON, XML, JMS, AMQP, HornetQ, Qpid, RabbitMQ

Mar 2007 – Jul 2009

GSI Commerce

King of Prussia PA

Solutions Architect

Initially hired as Senior Software Engineer/Tech Lead, responsible for design and implementation of enhancements to GSI's eCommerce platform, as well as mentoring junior staff and introducing process improvements. Participated in all phases of development life cycle. Maintained a high degree of client interaction, a high level of quality, and managed to meet or beat perpetually short deadlines.

Promoted to Solutions Architect, reporting directly to CTO. Responsible for working with clients to identify needs, along with initial design and prototyping of platform enhancements.

  • Technical lead for over 20 projects in 18 months, including two store launches; assisted numerous other projects. Clients included Aéropostale, Bath and Body Works, Levi's, and Zales Jewelers.
  • Developed an integration package for the Coremetrics web analytics package, consisting of a JSP taglib to generate data combined with a client-side JavaScript integration library to package that data in the format desired by particular clients.
  • Introduced development process improvements, including FindBugs for static analysis, Cactus for in-container testing, and Rhino for build-time JavaScript testing.

Java, JavaScript, JSP, JSP Taglib, Weblogic, Bazaarvoice, Coremetrics, Omniture SiteCatalyst

Mar 2005 – Mar 2007

Health Market Science

King of Prussia PA

Senior Software Developer

Developed Java-based applications to support HMS data acquisition and delivery.

  • Common Data Repository: a system to manage and transform large datasets, accessed via EJB. Responsible for a desktop client using Swing, automated load tools driven by JMS message queues, and Ant tasks allowing repeatable load scripts.
  • Prototype for a “next-generation” data matching system, using declarative rules expressed in XML to describe and relate data.
  • Entity Storage Manager: a system to efficiently store hierarchical datasets by replacing text with a compact, ID-based representation. Responsible for design (front-end and database) and implementation.

Acted as mentor for junior development staff, via one-on-one interaction as well as numerous “lunch and learn” sessions on topics ranging from Hibernate to Java bytecode.

Java, Swing, JSP, Servlet, Web Services, JBoss, Oracle, Maven, Ant

Mar 2004 – Mar 2005

Gestalt LLC

Camden NJ


Member of technical staff working on the Distributed Mission Interoperability Toolkit (DMIT) project, a DoD-sponsored web-service-driven set of applications providing integrated access to mission data.

  • Designed a client-side data model and transformation framework, allowing client code to remain consistent while server code was in constant flux.
  • Co-developed a Swing-based reference client for the DMIT services.
  • Developed a JSP-based web-application on the common client data model, using JSP taglibs to replicate Swing GUI components (pre-JSF).
  • Built numerous core GUI components to cover gaps in those provided with Java Swing.

Java, Swing, JSP, Servlet, Web Services, WebLogic, Oracle

Nov 2002 – Mar 2004

Wellfound Technology Inc

Marietta GA

Senior Architect

Member of Wellfound's consulting staff, with a lead role in the analysis, design and implementation of Enterprise Application Integration (EAI) solutions focused on the TIBCO product suite.

  • Mentored clients' technical staff on the design and implementation of EAI systems using the TIBCO product line (InConcert, IntegrationManager, BPM, ADB).
  • Provided leadership and mentoring in refactoring a client's J2EE application.
  • Analyzed and restructured a client's core database packages, reducing database load by 90% and improving end-user response time by more than 75%.

Oracle, SQL, PL/SQL, Java, TIBCO, InConcert, IntegrationManager

Sep 2000 – Jun 2002

TIBCO Software Inc, InConcert division

Cambridge MA

Senior Architect

Responsible for planning, designing, and (in many cases) implementing enhancements to the InConcert workflow server, a mature, cross-platform C++ application supporting multiple database back-ends. Feature roadmap was driven by input from both internal product management and direct customer communication.

Designed and prototyped a replacement server written in Java. Key features of this server:

  • Improved performance via multi-threading and object caching.
  • Ability to support multiple databases via object-relational mapping, with overrides for query optimization (pre-Hibernate).
  • Ability to run stand-alone (using TIBCO Rendezvous as communications layer) or inside J2EE EJB container.
  • Ability to support legacy clients via generated bindings.

Provided “crisis mode” support for clients, as well as mentoring and assistance to other departments within TIBCO.

C, C++, Java, SQL, PL/SQL, Oracle, TIBCO Rendezvous

Jan 1984 – Sep 2000

Mercator Software, Burlington MA (contract)

Parametric Technology Corp, Waltham MA; Software Engineer (contract)

InConcert Inc, Cambridge MA; Software Engineer (contract)

Fidelity Investments, Boston MA; Technical Advisor, Manager of Ad Hoc Programming

Symmetrix, Lexington MA; Associate

General Electric Aircraft Engines, Lynn MA; Software Engineer (contract)

BBN Communications Corp, Cambridge MA; Software Engineer (contract)

Strawberry Software, Watertown MA; Software Engineer

Keithley Instruments Data Acquisition & Control, Boston MA; Software Engineer

THINK Technologies, Lexington MA; Software Engineer


Harvard University

ALB cum laude, 2002; concentration in History

Skills Summary

  • Java
  • JavaScript/DHTML
  • SQL
  • C
  • Clojure
  • Ruby
  • Scala
  • Oracle
  • MySQL
  • Hypersonic/HSQLDB
  • Postgres
  • Redshift
  • Eclipse
  • NetBeans
  • Ant
  • Maven
  • CVS
  • Git
  • Mercurial
  • Subversion
  • Spring
  • Rails
  • AngularJS
  • JQuery / JQuery UI


Author: Programming with Motif; Springer-Verlag, 1992

Co-author: Complete Turbo-C; Scott, Foresman, 1989

Presenter, Philadelphia Java Users Group:

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Annotated list of open-source projects

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