Software Engineer
Current
May 2022 - Present
AeroLeads people directory · profile
John Crenshaw Email & Phone Number
Software Engineer
at
Meta
1 work email found
@offerup.com
3 phones found area 804, 800, and 206
LinkedIn matched
✓ Verified August 2026
4 data sources
Profile completeness 86%
Who is John Crenshaw? Overview
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Quick answer
John Crenshaw is listed as Software Engineer at Meta, based in Mukilteo, Washington, United States. AeroLeads shows a work email signal at offerup.com, phone signal with area code 804, 800, 206, and a matched LinkedIn profile for John Crenshaw.
John Crenshaw previously worked as Founder, CEO at Mageguys and Sr. Software Development Engineer at Offerup.
Company email context
Email format at Meta
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{first}.{last}@offerup.com
86% confidence
AeroLeads found 1 current-domain work email signal for John Crenshaw. Compare company email patterns before reaching out.
Profile bio
About John Crenshaw
I am a highly skilled technologist and entrepreneur with extensive experience developing and rebuilding cutting edge solutions. I focus on developing a strong architectural foundation for new start-ups, scaling and platform migration for growth businesses, and technology and process repair or replacement for established organizations with failing or outdated technology infrastructure.I work closely with business or product owners as they try to satisfy their IT needs. Sometimes businesses have a substantial gap in IT understanding and infrastructure, and I know how to fill that gap, either by building/developing the right team, or by rolling up my own sleeves and getting dirty. I'm not afraid to do whatever it takes and at the end of the day the buck always stops here.I'm a workaholic, but someday I'll retire to a small house on a warm beach with a hammock between two palm trees.Specialties: Scalable Backend, Microservices, Cloud Computing, Data and Code Architecture, performance optimization (network, memory, compute), AI and Machine Learning, Software Security (esp. for web technologies), C++, Python, Swift, PHP, HTML5, MongoDB, Javascript, Advanced CSS, Git, SVN, SQL, SQLite, Zend Framework, Magento
Listed skills include Javascript, Web Applications, Mysql, Php, and 33 others.
Current workplace
John Crenshaw's current company
Company context helps verify the profile and gives searchers a useful next step.
10 roles
John Crenshaw work experience
A career timeline built from the work history available for this profile.
Founder, Ceo
Mageguys
My moniker as a freelance developer. When I'm not busy on something else (and sometimes when I am), I'll be keeping my skills sharp building something cool for somebody.
Sr. Software Development Engineer
May 2020 - May 2022
Principal Software Engineer
Aug 2017 - Apr 2020
Head Of Development
Proximitygrid
Designed and load tested servers, developed data integration, and engineered voice interface for Proximity Grid's geopublishing and realtime engagement platform.
Jun 2015 - Aug 2017
Senior Partner | Technology & Engineering
Fgi.Com
Rebuilt team and processes. Improved software architecture and development processes for scalability and performance, improved user experience, quality controls, and security.
Aug 2012 - Jan 2015
Co-Founder, Cto
Edstart
Managed all technology and engineering as we scaled ExitTicket from product launch to thousands of concurrent users. Our product, ExitTicket, was acquired by Gooru Learning and is now integrated into their core platform.
Aug 2012 - Jan 2015
Co-Founder, Chief Architect
Assembled and led a team of developers to build Donedesk, a social productivity platform for individuals and enterprises. I established the large technical perspective, especially code architecture and security. I designed the web application framework for Donedesk, which among other things ensures linear scalability and security by design. We use sharding and indexes with automatic detection of bad queries to improve scalability; syntaxless query abstraction and database layers to shut down injection against the database; backend independent filesystem abstraction and sessions to ensure transparent clustering; and more.Previously developed the Trog Bar.
Sep 2006 - Apr 2012
Programmer
Redesigned the merge functionality for Ancestral Quest. I also developed the Database Merge, GEDCOM Merge, and the latest IGI search functionality.
Feb 2005 - Sep 2006
Progammer
I worked mostly on parts of the Ancestral Quest user interface. I also developed the the research manager feature added in version 11.
Oct 2001 - Oct 2002
FAQ
Frequently asked questions about John Crenshaw
Quick answers generated from the profile data available on this page.
What company does John Crenshaw work for?
John Crenshaw works for Meta.
What is John Crenshaw's role at Meta?
John Crenshaw is listed as Software Engineer at Meta.
What is John Crenshaw's email address?
AeroLeads has found 1 work email signal at @offerup.com for John Crenshaw at Meta.
What is John Crenshaw's phone number?
AeroLeads has found 3 phone signal(s) with area code 804, 800, 206 for John Crenshaw at Meta.
Where is John Crenshaw based?
John Crenshaw is based in Mukilteo, Washington, United States while working with Meta.
What companies has John Crenshaw worked for?
John Crenshaw has worked for Meta, Mageguys, Offerup, Taunt, and Proximitygrid.
How can I contact John Crenshaw?
You can use AeroLeads to view verified contact signals for John Crenshaw at Meta, including work email, phone, and LinkedIn data when available.
What skills is John Crenshaw known for?
John Crenshaw is listed with skills including Javascript, Web Applications, Mysql, Php, Subversion, Software Design, Git, and Web Development.
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