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We will describe a component of the Intelligent Data Delivery Service being developed in collaboration with IRIS-HEP and the LHC experiments. ServiceX is an experiment-agnostic service to enable on-demand data delivery specifically tailored for nearly-interactive vectorized analysis. This work is motivated by the data engineering challenges posed by HL-LHC data volumes and the increasing popularity of python and Spark-based analysis workflows. ServiceX gives analyzers the ability to querydoi:10.5281/zenodo.3598780 fatcat:sxivxzvv4zcbncntzidp3yvheu