Stef Nestor is a Senior Principal Support Engineer with 9 years of experience specializing in data architecture, security automation, governance, privacy, and monitoring, currently based in the Salt Lake City area. At Elastic and previously at MX, Stef built proactive security and data programs—founding fraud monitoring that detected large-scale credential stuffing, automating onboarding with role-based access controls, and cutting platform outages and escalations dramatically. He combines hands-on engineering (including contributions to the high-profile open-source Elasticsearch project and x-pack security) with product-minded automation that prevents multi-million-dollar failures and speeds recovery. Comfortable in fast-paced, autonomous environments, Stef brings a pragmatic blend of incident prevention, observability, and documentation that scales across teams. Outside of work he’s an avid hiker and philosopher who finds balance in hammocks and puppies—reflecting a thoughtful approach to resilient systems.
Free and Open Source, Distributed, RESTful Search Engine
Role in this project:
Back-end Developer
Contributions:99 reviews, 54 commits, 206 PRs in 1 year 7 months
Contributions summary:Stef contributed to the Elasticsearch project by addressing several areas, including error formatting, CAT nodes aliasing, and documentation links. Their work involved modifications to core server components, such as rest actions and shard limit validators. A significant portion of their contributions focused on improving the clarity of error messages and documentation, enhancing the user experience and maintainability of the system. The user also modified the x-pack security plugin.
Contributions:8 PRs, 59 pushes, 5 branches in 3 years 8 months
nestor
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Stef Nestor - Senior Principal Support Engineer at Elastic