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At Fractile, we're taking a revolutionary approach to computing to run the world's largest language models 100x faster than existing systems. Our fast-growing team is working at the cutting edge of the latest AI developments in both hardware and software. Want to get involved? We are looking for Senior Software Engineers with excellent embedded development skills to work on the runtime software of our ground-breaking AI accelerators. You can be based in either our London or Bristol offices. In this role, you will: Develop highly-optimised embedded software for Fractile's innovative AI accelerator hardware Contribute to wider system software, and our Linux kernel driver Work with hardware, lower-level software, and ML engineers in a highly collaborative hardware-software co-design methodology It would be great if you have: Proven deeply embedded software experience A good understanding of computer architecture and performance optimisation techniques Excellent C/C++ skills and solid experience of industry standard development tools and technologies Experience of writing optimising assembly code, ideally for RISC-V An creative and innovative mindset, and a willingness to take ownership and drive results in a fast-paced environment Computer Science, Electronic Engineering, Maths, Physics, or related degree and 3+ years of industry experience You may also have: Experience of working with GPUs or other machine learning accelerators Experience developing with Rust Knowledge of contemporary machine learning techniques and technologies Previous experience in a startup or small team environment

SII Group delivers Digital Services, IT, Engineering, and Consulting to diverse industries, enabling digital transformation through our commitment to Growth, People, and CSR. With over 16,000 professionals across 21 countries, we're recognised as a "Great Place to Work" for fostering a high-trust culture. Our core values of Trust, Transparency, and Quality drive our work package delivery, ensuring we meet and exceed client expectations as a committed partner. Since 2016, SII UK has supported top Aerospace & Defence, Aviation, Transportation, and Finance clients, empowering digital transformation with industry-leading engineering expertise. Let's Tech Together is our promise to encourage innovation and teamwork. We support our engineers with development opportunities and a collaborative, inclusive environment where every voice is valued and empowered. 'sTechTogether THE OPPORTUNITY We are seeking a highly experienced Senior Software Engineer with professional experience to join our team delivering large-scale, distributed, and safety-critical software systems. This role is ideal for an engineer who thrives in complex environments, values engineering rigour, and enjoys working across the full software lifecycle. You will play a key role in the design, development, integration, and assurance of high-integrity software, working closely with architects, project management, and wider engineering teams to ensure delivery against cost, quality, and schedule. KEY RESPONSIBILITIES: Design and develop distributed systems using C/C++ and Java Deliver software across the full lifecycle, from design to deployment Develop and debug software on Linux and Windows targets Apply high-integrity coding practices, including unit testing and static analysis Support software safety activities, including Software FMEA and safety compliance Produce clear, accurate technical documentation Contribute to CI/CD pipelines, build systems, and configuration management Collaborate with architects, project management, and engineering teams to deliver to cost, quality, and schedule. ESSENTIAL SKILLS & EXPERIENCE: Strong experience in C/C++ and Java Experience with Linux-based development Knowledge of software architectures and TCP/IP networking Unit and wider software testing Static analysis and secure/high-integrity coding standards (e.g. MISRA, JSF , AUTOSAR) CI/CD tools (e.g. Jenkins, Git) Containers and orchestration (Docker, Kubernetes) This role requires SC clearance (UK Eyes Only). DESIRABLE SKILLS: UML modelling and software design tools (e.g. Rhapsody, Enterprise Architect) Model-driven development and MATLAB/Simulink DevOps, Infrastructure as Code (e.g. Ansible), and GPU programming Software assurance, SBOM tooling, and cyber security awareness BENEFITS: Competitive Basic Salary 6% Employers Contribution + 6% as a salary sacrifice Private Medical Insurance, Life Cover and Income Protection 25 days holiday 10 days full sick pay per year Cycle to Work & TechScheme Corporate access to the Udemy platform If you're applying for a role requiring security clearance, please be aware that foreign or dual nationality is not an automatic bar, however certain posts may have restrictions which could affect those who do not have sole British nationality or who have personal connections with certain countries outside the UK. Software Integration & Verification Engineer SII Services Limited Cody Technology Park Ively Road Farnborough GU14 0LX