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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Infrastructure Site Reliability Engineer - **Company:** Radiant - **Location:** UK - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Artificial Intelligence, Intelligent Platform Management Interface, Bash Shell, BIOS, Ubuntu (Operating System), System Configuration, Dynamic Host Configuration Protocol, Linux, Domain Name System (DNS), Firmware, InfiniBand, Python (Programming Language), Linux System Administration, Routing, Performance Tuning, Reliability Engineering, Ansible, Prometheus, TCP/IP, Virtual Local Area Networks, Computer Networking Systems, High Performance Computing, Grafana, Kubernetes, Information Technology, Bare Metal - **Published:** September 5, 2026 - **Apply:** https://startup.jobs/infrastructure-site-reliability-engineer-radiant-8352619 ## About the Role * 5+ Years Proven experience in globally scaled, performance-intensive environments operating to a 24/7 support model * Expert-level Linux administration, especially Ubuntu distributions * Proficiency in system tuning, disk I/O optimization, and hardware-level performance tweaks * Familiarity with Out of Band management tools (IPMI, Redfish, PXE, etc.) * Strong networking fundamentals: TCP/IP, DNS, DHCP, VLANs, routing, switching * Strong experience with infrastructure scripting and automation (Bash, Python, Ansible) * Deep understanding of observability principles and tools (Prometheus, Grafana) * Hands-on experience operating orchestration platforms (Kubernetes, MAAS, Tinkerbell) * Strong grasp of ITSM and service operation best practices * Excellent communication and mentorship skills * Comfortable interfacing with internal stakeholders and external customers * Bonus: Knowledge of HPC workloads and GPU-based infrastructure * Bonus: Experience with InfiniBand networks and HPC performance tuning Nice to have: * Bachelor or Masters Level degree in Computer Science, Engineering or related field, or equivalent experience. * LPIC Certifications * ITIL Foundation level qualification or equivalent experience How you work: * You approach problems with a systems mindset - balancing practical execution with long-term scalability * You elevate the team, setting high standards for technical quality and engineering excellence. * You hold yourself and others accountable - giving direct feedback and expecting the same * You take initiative, owning challenges end-to-end and proactively driving solutions. * You invest in others, mentoring to build both capability and confidence. * You communicate clearly - translating complexity into clarity across engineering and business audiences ## Description We're looking for an experienced Infrastructure Site Reliability Engineer to run and evolve our infrastructure stack. You'll contribute across bare-metal, virtualization, and orchestration layers, keeping things stable and secure 24/7 x 365 - all while mentoring teammates, improving process and automation as well as helping translate deep technical concepts for a wide range of collaborators and customers. What You'll Do : * Deploy and operate resilient, scalable infrastructure supporting AI/HPC workloads * Optimize Linux system configuration, BIOS/firmware, kernel, and disk subsystem for performance * Configure, monitor and manage bare-metal infrastructure using IPMI, Redfish, etc * Build and maintain automation scripts and infrastructure as code to support platform lifecycle, as well as simplifying troubleshooting for Incident resolution and provision of tooling for our support organisation * Apply ITSM frameworks: Incident, Major Incident, Change Management, and service improvement. * Maintain and enhance 's observability stack: Prometheus, Grafana, and custom monitoring integrations * Operate and support services in 24x7 production environments, including on-call rotation * Contribute to Incident postmortem analyses, root cause analysis, document learnings, and automate remediations * Mentor junior engineers and act as an Operational requirements consultant to other departments * Communicate technical decisions clearly to non-technical stakeholders and customers * Uphold a culture of: do, document, automate * Willingness to cross train with Platform Engineering/Platform SRE to fully support both our infrastructure and platform stacks. * Willingness to cross train with HPC Engineering, supported by NVIDIA to enhance our * HPC supportability offering ## Related Videos - [An Applied Introduction to eBPF with Go](https://www.wearedevelopers.com/videos/1075-an-applied-introduction-to-ebpf-with-go) - [Shipping Faster with Less: Render on Cloud Hosting, AI Workloads, and the Future of DevOps](https://www.wearedevelopers.com/videos/1894-shipping-faster-with-less-render-on-cloud-hosting-ai-workloads-and-the-future-of-devops) - [Docker network without Docker](https://www.wearedevelopers.com/videos/1418-docker-network-without-docker) - [10M Data Records Lost, Underwater Computing, and Psychedelic Fish - Matthias Geniar](https://www.wearedevelopers.com/videos/1908-10m-data-records-lost-underwater-computing-and-psychedelic-fish-matthias-geniar) - [Turning Container security up to 11 with Capabilities](https://www.wearedevelopers.com/videos/718-turning-container-security-up-to-11-with-capabilities) - [SRE Methods In an Agency Environment](https://www.wearedevelopers.com/videos/348-sre-methods-in-an-agency-environment) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [The Most Popular IT Jobs on the Market](https://www.wearedevelopers.com/magazine/376-the-most-popular-it-jobs-on-the-market) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [IT Salaries in UK](https://www.wearedevelopers.com/magazine/288-it-salaries-in-uk)