Hail is a Spark-based framework for genomic computing at scale. We have explored the application of deferred evaluation to the construction of an interface between R and Hail. The interface implements standard base R and Bioconductor APIs on top of Hail by constructing expressions in Hail's interface language and evaluating them using sparklyr. Users require no special knowledge of Hail or Spark. We will describe the design of the interface and demonstrate the manipulation of a Hail-backed SummarizedExperiment object, the core abstraction for genomic data in Bioconductor.