John Farrelly
CTO at Bullet HQ
Dublin, Ireland
Summary
👤
Senior🎓
Top SchoolJohn Farrelly is a seasoned technology leader and CTO based in Dublin with 10+ years designing and operating large distributed systems across telecoms, finance, marketing and SaaS. He blends hands-on engineering—building data pipelines that process billions of events and microservice-based AI runtimes—with product-focused leadership, most recently leading Bullet’s all-in-one accounting and payroll platform. His background includes technical leadership at HubSpot and generative AI work at Shutterstock, and he holds a First Class M.Sc. in Artificial Intelligence, which informs pragmatic ML-informed system design. A founder-turned-CTO, he consistently prioritizes secure, intuitive tools that reduce operational overhead for customers while mentoring teams on engineering best practices.
10 years of coding experience
20 years of employment as a software developer
M50 Enterprise Programme Entrepreneurship/Entrepreneurial Studies, M50 Enterprise Programme Entrepreneurship/Entrepreneurial Studies at Technological University DublinM.Sc. in Artificial Intelligence Artificial Intelligence, M.Sc. in Artificial Intelligence Artificial Intelligence at Munster Technological UniversityComputer Systems Software, Computer Systems Software at University of Limerick
Stackoverflow
7,359reputation
763kreached
128answers
31questions
controller
top-5%
java
top-1%
spring-security
top-5%
spring-mvc
top-1%
spring
top-1%
abstract
top-5%
Github Skills (152)
stylus10
spring-mvc10
java10
spring10
image10
linux9
sql9
ai9
api9
connected-components9
database9
boost9
rust9
image-processing9
controller9
Programming languages (9)
Github contributions (5)
johnnyleitrim/mutation-testing-demo
Feb 2017 - Feb 2019
Contributions:17 commits, 28 pushes, 1 branch in 1 year 11 months
johnnyleitrim/cpmp-ls-ga
May 2021 - Dec 2021
Local Search & Genetic Algorithm implementations to solve the Container Pre-Marshalling Problem
Contributions:16 PRs, 26 pushes, 17 branches in 7 months
solveimplementationsmarshallinggeneticlocal-search
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