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Sean O'Halloran

@seanohalloran

I build reliable infrastructure through automation, observability, hardware troubleshooting, and performance benchmarking.

United States

Message

What I'm looking for

I'm looking to improve system reliability and operational efficiency through troubleshooting, automation, observability, hardware, networking, and adaptable technical problem-solving.

At Bloomberg LP, I built Python and Shell automation to detect infrastructure anomalies, improve availability, and reduce manual inspection across distributed systems.

I've developed boot-time benchmarking tools for CPU, memory, and disk I/O, presented hardware-health findings to stakeholders, and served as a primary contact for observability dashboards and search queries in Splunk, Humio, and Grafana. I also led QA for a proprietary SQLite-based database system, creating regression and verification tools that maintained 100% data integrity during quarterly releases.

My background spans data center operations, server and network troubleshooting, desktop support, cloud services, and hands-on hardware maintenance. I'm motivated by solving problems, improving reliability, and using technology to bring people together.

Experience

Work history, roles, and key accomplishments

Systems Reliability Engineer

Bloomberg LP

May 2007 - Feb 2026 (18 years 9 months)

Engineered automation scripts for anomaly detection, developed benchmarking tools, and led observability initiatives with Splunk, Humio, and Grafana. Spearheaded QA for a SQLite-based database system and optimized alerting with Regex filtering.