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John O'Callaghan Email & Phone Number
Senior Staff Engineer
at
S3 Group
LinkedIn matched
✓ Verified August 2026
2 data sources
Profile completeness 86%
Current company
Role
Senior Staff Engineer
Location
Cork, County Cork, Ireland
Company size
Who is John O'Callaghan? Overview
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Quick answer
John O'Callaghan is listed as Senior Staff Engineer at S3 Group, a with 74 employees, based in Cork, County Cork, Ireland. AeroLeads shows a matched LinkedIn profile for John O'Callaghan.
Company email context
Email format at S3 Group
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S3 Group
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Profile bio
About John O'Callaghan
John O'Callaghan is a Senior Staff Engineer at S3 Group. He possess expertise in embedded software, embedded systems, rtos, device drivers, c and 22 more skills. Colleagues describe him as "Worked with John on several projects, always a pleasure to work with, excellent engineer."
Listed skills include Embedded Software, Embedded Systems, Rtos, Device Drivers, and 23 others.
Current workplace
John O'Callaghan's current company
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S3 Group
1 role
John O'Callaghan work experience
A career timeline built from the work history available for this profile.
-
Senior Staff Engineer
Team & coworkers
Colleagues at S3 Group
Other employees you can reach at s3group.com. View company contacts for 74 employees →
АС
Александр Ситников
Colleague at S3 GroupTula, Russia, Russian Federation
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SA
Saad Ahmed
Colleague at S3 GroupPakistan
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AJ
Akalo Jerry
Colleague at S3 GroupNigeria
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SR
Sukanya Reddy
Colleague at S3 GroupEwan, New Jersey, United States
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KP
Kamila Piechota
Colleague at S3 GroupSan Jose, California, United States
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RA
Razi Ahmed
Colleague at S3 GroupKolkata, West Bengal, India
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LO
Liam O'Leary
Colleague at S3 GroupIreland
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AP
Aparna Prasad
Colleague at S3 GroupOdisha, India
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ST
Sharad Thik
Colleague at S3 GroupSangli, Maharashtra, India
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BM
Britto Messi
Colleague at S3 GroupFremont, California, United States
View →
Александр Ситников
Colleague at S3 GroupTula, Russia, Russian Federation
View →
SA
Saad Ahmed
Colleague at S3 GroupPakistan
View →
AJ
Akalo Jerry
Colleague at S3 GroupNigeria
View →
SR
Sukanya Reddy
Colleague at S3 GroupEwan, New Jersey, United States
View →
KP
Kamila Piechota
Colleague at S3 GroupSan Jose, California, United States
View →
RA
Razi Ahmed
Colleague at S3 GroupKolkata, West Bengal, India
View →
LO
Liam O'Leary
Colleague at S3 GroupIreland
View →
AP
Aparna Prasad
Colleague at S3 GroupOdisha, India
View →
ST
Sharad Thik
Colleague at S3 GroupSangli, Maharashtra, India
View →
BM
Britto Messi
Colleague at S3 GroupFremont, California, United States
View →
FAQ
Frequently asked questions about John O'Callaghan
Quick answers generated from the profile data available on this page.
What company does John O'Callaghan work for?
John O'Callaghan works for S3 Group.
What is John O'Callaghan's role at S3 Group?
John O'Callaghan is listed as Senior Staff Engineer at S3 Group.
Where is John O'Callaghan based?
John O'Callaghan is based in Cork, County Cork, Ireland while working with S3 Group.
What companies has John O'Callaghan worked for?
John O'Callaghan has worked for S3 Group.
Who are John O'Callaghan's colleagues at S3 Group?
John O'Callaghan's colleagues at S3 Group include Александр Ситников, Saad Ahmed, Akalo Jerry, Sukanya Reddy, and Kamila Piechota.
How can I contact John O'Callaghan?
You can use AeroLeads to view verified contact signals for John O'Callaghan at S3 Group, including work email, phone, and LinkedIn data when available.
What skills is John O'Callaghan known for?
John O'Callaghan is listed with skills including Embedded Software, Embedded Systems, Rtos, Device Drivers, C, Software Development, Object Oriented Design, and Linux.
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