We have an opening for a Finite Element and HPC - Postdoctoral Researcher to perform research and development of finite element (FEM) discretizations and automatic differentiation (AD) algorithms in support of LLNL multiphysics high-performance computing (HPC) applications based on the MFEM finite element library. Of particular interest are applications involving high-order Arbitrary Lagrangian Eulerian (ALE) radiation-hydrodynamics as well as structural mechanics with contact running on large GPU system like LLNL's El Capitan. This position will be part of the MFEM team in the Numerical Analysis & Simulations Group of the Center for Applied Scientific Computing (CASC) Division within LLNL's Computing Directorate. You will Collaborate with a broad spectrum of scientists at LLNL on a joint research effort to enable differentiable simulations in large-scale multi-physics simulation codes. Research new algorithms for efficient and scalable high-order finite element meshing, discretizations and solvers in the context of differentiable multi-physics HPC applications. Implement and test the new methods in the MFEM finite element library, targeting flexible user interface, applicability to variety of applications, and parallel GPU scalability. Work with LLNL application teams to incorporate, evaluate and improve the performance of the new differentiable algorithms in specific applications. Document complex research and development progress via technical reports, journal publications, and conference presentations. Perform other duties as assigned.