Cillian Collins
Senior Associate Cybersecurity Engineer
Dublin, Ireland
Summary
👤
Senior🎓
Top SchoolCillian Collins is a Senior Associate Cybersecurity Engineer based in Dublin with nine years of software engineering experience and a strong focus on web application security. He moved through progressive engineering roles at Workday after internships at TitanHQ and has freelanced as a security researcher for HackerOne, finding critical vulnerabilities in high-profile targets like Sony and Twitter. An active CTF competitor and blogger (m0z.ie), he blends hands-on offensive research with pragmatic secure-development practices. Cillian’s background combines formal computer science training from the University of Galway with real-world incident discovery and remediation experience, making him adept at both finding and fixing security gaps before they reach production.
9 years of coding experience
5 years of employment as a software developer
Bachelor of Science (Honours) Computer Science and Information Technology, Bachelor of Science (Honours) Computer Science and Information Technology at University of GalwayLeaving Certificate, Leaving Certificate at Coláiste Iognáid
English, Irish, German
Stackoverflow
728reputation
52kreached
35answers
0questions
Github Skills (35)
enumerate10
pentest8
scanning8
directories8
web-application-security8
infosec7
security7
xyz7
firebase7
tomcat6
angular6
xss6
python-requests6
htaccess6
csrf6
Programming languages (4)
Github contributions (5)
ECSCIreland/ECSCIreland.github.io
Jun 2023 - Jan 2025
Website for ireland.re
Contributions:2 PRs, 50 pushes in 1 year 6 months
Cillian-Collins/subscraper
May 2020 - Jul 2020
Reconnaissance tool which scans javascript files for subdomains and then iterates over all javascript files hosted on subsequent subdomains to enumerate a list of subdomains for a given URL.
Contributions:32 commits, 5 PRs, 29 pushes in 1 month
web-application-securityenumeratebugbountysecurityhosted
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