Ronan O'Sullivan
About
I'm a software engineering leader with over 25 years of experience spanning enterprise software, cloud platforms, telecommunications, and embedded systems, including more than 15 years in engineering leadership.
My background combines hands-on software development with leading globally distributed engineering teams. I've worked across the full software lifecycle, from low-level C/C++ development, real-time operating systems, and embedded platforms to large-scale Java enterprise applications, SaaS platforms, and cloud infrastructure.
Throughout my career, I've focused on solving difficult technical problems, improving how engineering teams operate, and delivering reliable software for enterprise customers. My experience includes leading cloud migrations, modernizing legacy platforms, improving CI/CD and release processes, and managing engineering organizations across multiple countries.
One of my major projects involved leading a zero-downtime upgrade initiative that reduced enterprise software rollout timelines from six months to six weeks while eliminating customer-impacting upgrade outages.
I'm particularly interested in engineering leadership, software architecture, developer productivity, emerging technologies, and the practical application of AI in software development.
Based in southern New Hampshire, I enjoy connecting with other technology professionals, sharing experiences, and contributing to the local technology community.
Additional Info
25+ years in software engineering: Experience across embedded systems, telecommunications, enterprise applications, and cloud-based software.
15+ years in engineering leadership: Led globally distributed teams of up to 25 people, including engineering managers, software engineers, and DevOps professionals.
Zero-downtime software upgrades: Led a cross-functional initiative that reduced enterprise deployment timelines from six months to six weeks.
Cloud and platform modernization: Led enterprise SaaS migrations, database modernization, and initiatives to transition monolithic applications toward microservices.
Strong technical foundations: Extensive experience in Java, C/C++, Linux/Unix, embedded systems, build systems, and complex software troubleshooting.
Security and reliability: Led engineering initiatives supporting PCI DSS, HIPAA, GDPR, vulnerability remediation, and improved production reliability.
Global engineering experience: Worked in Ireland, Norway, and the United States, leading teams across North America, Europe, and Asia-Pacific.