Lead Engineer - Software & HPC Engineering

We're seeking a Lead HPC Engineer - or an experienced Senior HPC Engineer ready to step up - to take ownership of a large-scale, high-performance computing environment.

You'll support and evolve an HPC cluster of over 10,000 cores, ensuring reliability, performance, and scalability for workloads ranging from single high-precision runs to thousands of parallel simulations.

Working within the Software & HPC Engineering team, you'll collaborate closely with computational scientists, data engineers, and IT specialists to deliver a robust platform that underpins cutting-edge research and development.

Key Responsibilities

• Maintain and optimise HPC hardware, working with external vendors where required
• Manage core system software and ensure platform stability
• Monitor performance, troubleshoot issues, and drive continuous improvements
• Oversee backups of critical data and system configurations
• Schedule and perform maintenance aligned with user activity
• Profile workloads and enhance system efficiency
• Communicate system status, updates, and major issues to stakeholders
• Capture user requirements and contribute to upgrade and capacity planning
• Support procurement processes and vendor negotiations
• Produce clear documentation for both technical teams and end users
• Collaborate across engineering and IT teams on shared infrastructure

Current Environment

You'll be working with a modern HPC stack, including:

• Large-scale multi-vendor server infrastructure (AMD EPYC, Intel Xeon)
• High-speed networking (100Gb LAN) and high-performance storage systems
• Linux-based environments (AlmaLinux, Ubuntu)
• Distributed file systems (Lustre, GlusterFS, NFS)
• HPC tooling including Slurm, Ansible, and monitoring frameworks
• Development ecosystems supporting C++, Fortran, MPI, and Python

Essential:

• Degree in Computer Science (or equivalent experience)
• Strong expertise in Linux, HPC systems, storage, and networking
• Experience with MPI and scientific computing environments (C++, Fortran)
• Familiarity with job schedulers and workload management systems
• Scripting skills (Shell, Python) and version control (Git)
• Ability to design, implement, and support complex HPC systems
• Strong analytical thinking and problem-solving skills
• Excellent communication and collaboration abilities

Desirable:

• Deep expertise in HPC optimisation and performance profiling
• Experience with configuration management tools (e.g. Ansible)
• Knowledge of containerisation (e.g. Singularity, Apptainer)
• Experience working with secure or air-gapped environments
• Familiarity with HPC accounting systems and SQL databases
• Experience supporting and training end users

Rullion celebrates and supports diversity and is committed to ensuring equal opportunities for both employees and applicants.

Are you ready to play a key role in one of the most ambitious technological challenges of our time? We are a pioneering UK-based deep-tech company developing next-generation solutions at the cutting edge of advanced physics, simulation, and machine learning. Our work is focused on unlocking scalable, clean energy through breakthrough approaches, supported by world-class computational capabilities and innovative engineering. Alongside our core mission, we collaborate with leading organisations across advanced industries, applying our proprietary simulation tools and technologies to solve complex, high-impact challenges. This is a rare opportunity to join a highly skilled, mission-driven team working at the forefront of science and engineering innovation.