Senior Modelling Engineer; CPU group

The Future of AI is Built on Arm. Are you fascinated by how cutting-edge CPUs are engineered to power every corner of the technology world? Do you want to contribute to the momentum that’s transforming how people work, play, and connect?

At Arm, your work will impact billions of lives. If you’re passionate about building technology that powers everything from smartphones to supercomputers, we’d love to meet you!

As a Sr CPU Performance Modelling Engineer, you’ll be at the heart of designing Arm’s power-efficient CPUs for the next generation of workloads. You’ll define and deliver critical performance and power metrics, apply innovative analysis techniques, and uncover opportunities to push processor and cache performance even further. Beyond engineering, you’ll also play a key role in mentoring junior engineers and collaborating across global teams to refine and optimise our shared practices.

You’ll join forces with CPU engineering teams across the UK to evaluate and enhance the performance features of world-class micro architectures. Working with workloads that mirror what future CPUs will run, you’ll continuously evolve our methodologies to ensure they remain best-in-class.

If you’re excited by the idea of peering under the hood of CPUs, understanding their inner workings, and pushing their limits, this role is for you. It’s an exceptional opportunity to be part of a world-leading CPU performance optimisation team.

• Analyse and report CPU/IP performance across the full development cycle.
• Collaborate with designers and performance engineers to improve power, performance, and area (PPA) of IPs.
• Develop and enhance infrastructure that employs emulators, simulators, and FPGAs to evaluate performance and power.
• Provide actionable insights to customers, architects, and marketing teams on how IPs perform across different scenarios and use cases.

• Strong grasp of CPU micro-architecture concepts (pipelines, caches, predictors, MMUs).
• Hands-on experience with low-level embedded C or assembly for coding, testing, optimisation, and debugging.
• Proficiency in Linux environments with strong scripting skills (Shell, Python, or Perl)

• Solid background in CPU performance analysis using industry benchmarks.
• Familiarity with HDL languages (Verilog/VHDL) and RTL simulator/emulator environments.
• Exposure to hardware design and/or CPU performance modelling.
• Understanding of the Arm instruction set architecture and assembly language.
• Familiarity with compilers and code generation techniques.
• Broader knowledge of system architecture.
• A strong academic background with a degree in Computer Science, Electronic Engineering, or a related field.

Arm is committed to global talent acquisition, offering an attractive relocation package. With offices around the world, Arm is a diverse organisation of dedicated, creative and talented engineers. By enabling a dynamic, inclusive, meritocratic, and open workplace, where all our people can grow and succeed, we encourage our people to share their unrivaled contributions to Arm's success in the global marketplace.

Please note that no relocation package is available for this role.

If skilled worker sponsorship is required, Arm will meet costs associated with sponsorship for the employer only. All fees associated with the individual’s application e.g. visa application fee and Immigration Health Surcharge, will be the responsibility of the successful candidate.

At Arm, we want to build extraordinary teams. If you need an adjustment or an accommodation during the recruitment process, please email  To note, by sending us the requested information, you…