John Farrelly
Summary
👤
SeniorJohn 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
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 (121)
stylus10
spring-mvc10
boost10
java10
spring10
django9
linux9
sql9
ai9
api9
database9
controller9
amazon-cloudfront9
jakartaee9
spring-security9
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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