Keith D Gregory


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


June 2019 – present

Chariot Solutions

Fort Washington, PA

AWS / Data Engineering Practice Lead

I returned to Chariot to improve its ability to compete for and deliver AWS-centric projects. Over time, Data Engineering became a larger part of our business, and my role grew to encompass it.

Internally, I had the following responsibilities:

  • Outreach: including blogging and speaking engagements.
  • Sales Support: including proposal development, assessments, and client meetings.
  • Developer Enablement: including internal training, mentoring, and serving as a backstop at client engagements.

And in addition, I was hands-on with the following projects:

  • A service to manage the location of corporate assets via IoT tags, alerting when the tagged assets moved. My role was primarily architectural, to help the team plan and then evolve the system based on client needs and data volumes.
  • Data engineering at an early-stage online gaming operator. Developed data pipelines based on AWS Kinesis and AWS Lambda, DBT models for AWS Redshift, worked with Marketing and other data consumers to ensure that their SQL was correct and efficient, and with engineering management to evolve the data platform to meet increasing volume and disparate needs.
  • A data warehouse platform for a regional bank. Used a combination of AWS services and custom code to extract data from multiple sources, store it as Parquet in an S3 data lake, then transform and expose via Redshift.

Java, Python, SQL (Postgres/Redshift/Athena), Amazon Web Services (multiple), DBT, Airflow, etc

May 2018 – June 2019

Wingspan, an IQVIA Company

Blue Bell, PA

AWS Architect

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


Philadelphia, PA

Lead Software Engineer

Senior 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 deployment drift.
  • Migrated 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


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 Stitch 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), resulting in three months from incept to customer usage of the MVP.
  • Redshift query optimization and planning, to support multiple tenants in the company's CloudBI product.

Clojure, Python, 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. Projects included:

  • 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 non-relational (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 a map compiler framework, which transformed 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.

Jan 1984 – Jun 2010

available here


Harvard University

ALB cum laude, 2002; concentration in History

Skills Summary

Primary Languages:
  • Python
  • Java
  • SQL
  • Postgres
  • Amazon Athena
  • Amazon Redshift
  • MySQL
  • CloudFormation
  • Terraform
  • Git
  • Eclipse
  • Maven
  • Airflow
  • Spark
  • Spring



Open-source projects focusing on increased programmer productivity with Java and AWS.

Personal and professional blog posts on technology, software development, and data engineering.

Presentations for regional user groups and conferences.

Co-organizer, Greater Philadelphia AWS User Group .

AWS Certifications: Solutions Architect Professional, Security Specialty.

Copyright Keith D Gregory, all rights reserved

Recruiters may not republish or redistribute this resume in any form without express written consent.