Senior Software Engineer — Runtimes and Architecture

Salary: £45,000 - 80,000 per year

Requirements:

• We are looking for a flexible, inquisitive engineer with an interest in compilers, language runtimes, and CPU architecture.
• We need a flexible, problem-solving approach and a commitment to extend the breadth and depth of knowledge.
• We require experience working on language runtimes, compilers, or similar technologies.
• We require strong programming skills in at least one of C, C++ or Rust.
• We require familiarity with computer architecture and microarchitecture concepts such as cache hierarchies and CPU pipelines, preferably relating to AArch64.
• Nice to have: proficiency in one or more of Java, JavaScript, Python, Rust or WebAssembly.
• Nice to have: familiarity with assembly language and low-level development for AArch64.
• Nice to have: familiarity with Linux performance analysis tools and system-level performance tuning.
• Nice to have: familiarity with build systems and CI.
• Nice to have: experience contributing to open-source projects.

Responsibilities:

• We study existing, new, and proposed extensions to the Arm architecture to determine their applicability and optimal use by modern language runtimes and compilers.
• We work with Arm architects to help shape future architecture features.
• We work with runtime engineers to ensure features are used effectively in real-world language implementations.
• We analyse architecture features and identify opportunities for their use in language runtimes and compilers.
• We work with architects to suggest or improve proposals where appropriate.
• We own and are accountable for specific investigations, with guidance where appropriate.
• We collaborate with colleagues across Arm to improve the Arm architecture and ensure it is effectively used.
• We contribute to open-source software projects and engage with open-source communities.
• We contribute to documentation efforts, including internal documentation and external blog posts, to communicate findings.
• We help develop tooling and automation to support these activities.

Technologies:

• ARM
• Support
• Java
• JavaScript
• Linux
• Python
• Rust
• WebAssembly
• AI
• Architect

More:

We are part of the larger CE-SW Runtimes team, focused on improving modern language support on the Arm architecture, from JavaScript to Rust. We work closely with colleagues across the organisation and with open-source communities to tackle challenges in enabling the future of computing. With us, you will have the opportunity to learn about and influence the latest Arm architecture features, collaborate with diverse compiler and runtime teams, and contribute to language implementations used by millions of developers worldwide. We support a hybrid working model designed to balance high performance and personal wellbeing, with team-specific patterns shaped around the needs of the work. We are an equal opportunity employer committed to mutual respect, inclusion, and fair treatment for all applicants and colleagues. We also support recruitment adjustments and accommodations where needed, and if skilled worker sponsorship is required, we cover employer sponsorship costs.

last updated 34 week of 2026