Thomas Callahan

Thomas Callahan

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VP Engineering - Customer Data Platform
Westlake, Ohio, United States

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work
Job
school
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Résumé

Jobs verified_user 0% verified
  • Hightouch
    VP Engineering - Customer Data Platform
    Hightouch
    Sep 2025 - Current (1 year 1 month)
    Engineering leader for Hightouch's Composable CDP — a Leader in the Gartner MQ, activating customer data for Fortune 50 brands without it ever leaving their warehouse. Beyond the CDP, I support platform initiatives across the company, such as owning our information security program and driving developer & AI productivity.
  • Nuna Inc
    VP Engineering - Value Platform
    Nuna Inc
    Jan 2023 - Aug 2025 (2 years 8 months)
    Led development for two organizations (~75 people). The first was cross-functional team of developers, analysts, and PMs delivering penny-accurate value-based payments to physicians using a Spark-based data pipeline on AWS. The second was a team building a platform and applications to support the Medicare Advantage bid process
    • Responsible for the people, planning, and execution for engineering to carry out the company’s strategy
    • Drove the collaboration to define our go-forward product & technical architecture
    • Owned prioritization and execution for our legacy customers, including creating a transparent roadmap we collaborated on with customers, reducing average open customer-reported bug count to 0 for the first time, an
  • Elastic
    Senior Director Of Engineering
    Elastic
    Aug 2022 - Aug 2023 (1 year 1 month)
    Led the Elasticsearch team through Elastic’s IPO, transformation to a platform team, and an initial SaaS offering.
    During this time we scaled the team from 40 to 80 people and shifted team culture to execute as a platform for the newly established Security, Observability, and Enterprise Search Solution teams
    • Established team practices to support our scale, including roadmapping, structured hiring/interviewing, design
    documentation, and career development – including the first “promo packet” practice at the company
    • Enabled Solution-defining features such as searchable S3 snapshots (reduced client storage costs by 50%), APM, and more by growing our project/stakeholder management skills across dozens of leaders
    •
  • Elastic
    Director Of Engineering
    Elastic
    Jan 2018 - Jan 2022 (4 years 1 month)
  • IBM
    Director & Architect, VB Platform Engineering
    IBM
    Jan 2016 - Jan 2018 (2 years 1 month)
    Led our platform team of 45 engineers responsible for over 70 million lives from 15+ EMR systems, identifying at-risk patients to enable better outcomes at lower cost. I drove hiring and delivery for the organization, including delivering major integrations with international teams.
  • Heureka Software
    Software Architect
    Heureka Software
    Jan 2015 - Jan 2016 (1 year 1 month)
    Design and implementation of the Heureka Intelligence Platform, an endpoint-centric information governance and risk compliance solution. I focused on driving a healthy and efficient technical culture as well as balancing business and engineering concerns. I was responsible for being the technical voice with respect to pre-sales customer meetings. I worked with an excellent team of developers to build a cloud offering for the HIP on Google Cloud using Docker and Kubernetes. We were among early users of GCP's k8s offering and scaled to tens of thousands of containers to stress test our platform.
  • Explorys an IBM Company
    Senior Software Engineer
    Explorys an IBM Company
    Jan 2014 - Jan 2015 (1 year 1 month)
    My primary role was on the Indexing team, focused on big data design and implementation -- primarily using Apache Hadoop & HBase. I specialized in performance optimization and rapid debugging of production issues across the stack. I provided technical leadership in the areas architecture, development, operations, and business intelligence. I also performed a DBA role for MySQL and Vertica.
  • Explorys an IBM Company
    Software Engineer
    Explorys an IBM Company
    Jul 2013 - Jan 2014 (7 months)
  • Case Western Reserve University
    Research Assistant
    Case Western Reserve University
    Jan 2009 - May 2013 (4 years 5 months)
    Probed and assessed over 1 million DNS resolvers on the Internet to assess topology, security, and protocol compliance
    Analyzed DNS and HTTP packet traces to study client and server behavior
    Leveraged open recursive DNS servers for information storage and peer-to-peer bootstrapping
    Proposed and prototyped new user-centric Internet naming system
  • I
    Summer Research Intern
    International Computer Science Institute
    Jan 2009 - Jan 2012 (3 years 1 month)
    Analyzed properties of DNS and HTTP traffic
  • W
    Consultant
    Westlake City School District
    Jan 2007 - Jan 2012 (5 years 1 month)
    Implemented Active-Directory based software deployment (and software packaging)
    Designed and implemented virtualized (VMWare), shared-storage (SAN) environment
    Deployed network monitoring system
    Performed group policy, DHCP, and DNS administration
    Led Exchange 2007 to 2010 migration
  • M
    Support Specialist and Intern
    Miami University SEASIT
    Jan 2004 - Jan 2008 (4 years 1 month)
    Led migration of division website to Typo3 content management system
  • W
    Student Technician
    Westlake City School District
    Feb 2002 - May 2006 (4 years 4 months)
    Performed computer maintenance and imaging
Education verified_user 0% verified
  • Case Western Reserve University
    M.S, PhD, Computer Science
    Case Western Reserve University
    Jan 2008 - Jan 2013 (5 years 1 month)
  • Miami University
    Bachelor of Science (B.S, Computer Science
    Miami University
    Jan 2004 - Jan 2008 (4 years 1 month)
Awards verified_user 0% verified
  • E
    Eagle Scout
Publications verified_user 0% verified
  • A
    On Measuring the Client-Side DNS Infrastructure
    ACM Internet Measurement Conference Oct
  • A
    On Modern DNS Behavior and Properties
    ACM SIGCOMM Computer Communication Review Feb
  • I
    Pssst, Over Here: Communicating Without Fixed Infrastructure
    IEEE InfoCom MiniConference Mar
  • A
    On Grappling with Meta-Information in the Internet
    ACM SIGCOMM Computer Communication Review Oct
  • P
    Assessing DNS Vulnerability to Record Injection
    Passive and Active Measurement Conference Mar
  • P
    A Longitudinal View of HTTP Traffic
    Passive and Active Measurement Conference Apr
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