Chief Technology Officer
Small Datum Llc
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Mark Callaghan Email & Phone Number
Chief Technology Officer
at
Small Datum LLC
1 work email found
@prounlimited.com
LinkedIn matched
✓ Verified May 2026
4 data sources
Profile completeness 100%
Current company
Small Datum LLC
Role
Chief Technology Officer
Location
United States, United States, United States
Who is Mark Callaghan? Overview
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Quick answer
Mark Callaghan is listed as Chief Technology Officer at Small Datum LLC, based in United States, United States, United States. AeroLeads shows a work email signal at prounlimited.com and a matched LinkedIn profile for Mark Callaghan.
Mark Callaghan previously worked as Member Of Technical Staff at Prounlimited and Software Engineer at Rockset. Mark Callaghan holds Ms, Computer Science from University Of Wisconsin-Madison.
Company email context
Email format at Small Datum LLC
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{first_initial}{last}@prounlimited.com
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AeroLeads found 1 current-domain work email signal for Mark Callaghan. Compare company email patterns before reaching out.
Profile bio
About Mark Callaghan
I focus on open source database architecture with expertise in MySQL, Postgres and RocksDB. I offer consulting via Small Datum LLC.
Listed skills include Python, Mysql, Sql, Scalability, and 23 others.
Current workplace
Mark Callaghan's current company
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Small Datum Llc
10 roles · 30 years
Mark Callaghan work experience
A career timeline built from the work history available for this profile.
Member Of Technical Staff
Current
Prounlimited
Onsite at Meta
Oct 2021 - Present
Chief Technology Officer
Current
Small Datum Llc
Sep 2020 - Present
Software Engineer
Jan 2021 - Jul 2021
Dec 2019 - Sep 2020
Tech Lead For Mysql Engineering
My focus is transaction processing and storage efficiency. My team supports large, sharded DBMS clusters that exceed 100M queries and disk reads per second. We continue to make MySQL much better. We have started to do the same for MongoDB and RocksDB, a write-optimized database engine. Our innovation with MySQL includes InnoDB compression for OLTP.
2009 - Jan 2019
Tech Lead For Mysql Engineering
We made MySQL much better for a very large and sharded MySQL cluster. Some of the features that we did first and ran at web scale include semi-sync replication, global transaction IDs, scalable read-write lock for InnoDB, user & table statistics, crash safe replication and roles.
2005 - 2009
~4 yrs
Software Engineer
2005 - 2005
Member Of Technical Staff
Fixed many bugs in the query execution engine and optimizer with a focus on bitmap indexes.Rewrote in-memory sort:* http://www.google.com/patents/US7680791* http://www.oracle.com/technetwork/middleware/bi-foundation/twp-general-sort-performance-10gr2--1-128075.pdfAdded IEEE754 datatypes (binary_float, binary_double)
1997 - 2005
~8 yrs
Software Engineer
Informix
Database internals
1996 - 1997
~1 yr
3 education records
Mark Callaghan education
Ms, Computer Science
University Of Wisconsin-Madison
Bs, Computer Science
San Diego State University
Computer Science
Rutgers University
FAQ
Frequently asked questions about Mark Callaghan
Quick answers generated from the profile data available on this page.
What company does Mark Callaghan work for?
Mark Callaghan works for Small Datum LLC.
What is Mark Callaghan's role at Small Datum LLC?
Mark Callaghan is listed as Chief Technology Officer at Small Datum LLC.
What is Mark Callaghan's email address?
AeroLeads has found 1 work email signal at @prounlimited.com for Mark Callaghan at Small Datum LLC.
Where is Mark Callaghan based?
Mark Callaghan is based in United States, United States, United States while working with Small Datum LLC.
What companies has Mark Callaghan worked for?
Mark Callaghan has worked for Small Datum Llc, Prounlimited, Rockset, Mongodb, and Facebook.
How can I contact Mark Callaghan?
You can use AeroLeads to view verified contact signals for Mark Callaghan at Small Datum LLC, including work email, phone, and LinkedIn data when available.
What schools did Mark Callaghan attend?
Mark Callaghan holds Ms, Computer Science from University Of Wisconsin-Madison.
What skills is Mark Callaghan known for?
Mark Callaghan is listed with skills including Python, Mysql, Sql, Scalability, Distributed Systems, Multithreading, Performance Tuning, and C++.
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