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James Crnkovich
Member of Technical Staff, RunSybil

James earned a B.S. in civil and environmental engineering from Carnegie Mellon in 2018, followed by an M.S. in 2019. He spent five years in data science roles at the CIA, starting as a Data Scientist in 2019, moving to Senior Data Scientist in 2021, and finishing as Chief of Data Science for South and Central Asia from 2022 to 2024, before moving to Meta as a Data Scientist in 2024. At Meta, he worked on developing techniques to measure the quality of the cybersecurity benchmarks used to evaluate Meta’s Llama 3, Llama 4, and other open-source models prior to their release. He joined RunSybil in 2025 as a Member of Technical Staff. His background in applied data science, quantitative measurement, and designing effective benchmarks shapes his work at RunSybil where he builds the experimentation frameworks the team uses to measure Sybil's performance.

Articles by
James Crnkovich
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AI Engineering
June 18, 2026

Sybil Is a Funnel: Our Approach to A/B Testing Complex Agentic Systems

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