Rajeev Jain

Rajeev Jain

Principal Specialist, Research Software Engineering at Argonne [CV]

Rajeev Jain

Principal Specialist, Research Software Engineering at Argonne National Laboratory. Since 2009, I’ve built high‑performance, reliable research software with domain scientists across cancer data science, climate computation, multiphysics simulation, urban systems, and nuclear reactor modeling.

I work across fields and teams to turn complex problems into dependable software. I like clear goals, simple designs, and fast feedback: build, test, measure, improve. Most of my work sits at the boundary between research and production.

  • Projects span cancer data science, climate tools, multiphysics codes, urban systems, and reactor modeling.
  • Grateful to have worked with great people; I try to keep things simple, practical, and useful.
  • Prefer small, steady steps over big promises; measure outcomes and improve.

For fun: I like to bike 🚴, play pickleball 🏓, and learn about crypto ₿.

Read more about my background →

Projects

  • UXarray — Unstructured climate grids toolkit (Python), up to 60× faster on key workloads. Details →
  • CANDLE/Supervisor — Scalable DL workflows for drug response across supercomputers. Details → · R&D 100 (2023)
  • FLASH‑X — Async HDF5 I/O and verification for multiphysics; >20% I/O speedups. Details → · R&D 100 (2022)
  • Urban ECP — Coupled microclimate + building energy modeling for city‑scale insights. Details →
  • NEAMS SIGMA/MeshKit/RGG — Reactor core mesh tools; cut modeling time from weeks to hours. Details →
  • Arizona State University — RA/TA: FEM-based blast mitigation and instruction in structural engineering. Details →

Selected Publications

  • UXarray: Extending Xarray for Enhanced Support of Unstructured Grids. EGU General Assembly 2025 (2025). DOI
  • CANDLE/Supervisor: A workflow framework for machine learning applied to cancer research. BMC Bioinformatics (2018). DOI
  • High-resolution coupled physics solvers for analysing fine-scale nuclear reactor design problems. Phil. Trans. R. Soc. A (2014). DOI
  • Representation and evolution of urban weather boundary conditions in downtown Chicago. Journal of Building Performance Simulation (2020). DOI
  • Creating geometry and mesh models for nuclear reactor core geometries using a lattice hierarchy-based approach. Engineering with Computers (2012). Link

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