Summary
John Heemstra is a Senior Software Engineer with 11+ years in high-performance computing and a long track record at Cray/HPE building and triaging networking and deployment software for supercomputers. He blends deep hands-on skills in C, assembly, Linux kernel drivers, MPI, Python, and Ansible with DevOps and LEAN philosophies, often operating as a tech lead or hands-on manager. At HPE he has driven bare-metal Kubernetes deployments and currently triages Slingshot host software including Libfabric and the Cassini NIC driver. His background in psychology, physics, and mechanical/electrical engineering gives him a systems-thinking edge and strong emotional intelligence when leading small teams and reporting to senior executives. He has repeatedly modernized operational practices—e.g., overhauling triage processes and building automated install/test tooling—that enabled peak system performance at scale. Based in Fennville, Michigan, he prefers engineering-driven environments and excels at turning low-level networking and kernel work into reliable, deployable systems.
11 years of coding experience
25 years of employment as a software developer
Bachelor of Science Computer Science, Bachelor of Science Computer Science at Michigan Technological University
Engineering, Engineering at Grand Rapids Community College