Senior Platform Engineer

Salary: £65,000 - £75,000 Location: Remote, but within the UK Please note: We are unable to sponsor international visas at this time. About Nexus Mods Established in 2001, Nexus Mods is the largest video game modding platform on the internet - a household name in the PC gaming ecosystem. 71M+ registered members 800K+ mods for 4,000+ games 21B+ mod downloads We’re currently focused on product modernisation, driving growth and building infrastructure for the next 10 years of community-powered modding. Our Role: We're looking for a Senior Platform Engineer with deep knowledge of frontend build tooling, JavaScript ecosystems, and SPA deployment. You'll bridge the gap between our frontend engineering teams and our infrastructure, ensuring that the build, test, and deployment pipeline for our frontend applications is fast, reliable, and well-supported. You'll still be a Platform Engineer, working within the Platform Engineering team, but your specialism will be the frontend stack. Build, maintain, and improve our Kubernetes platform, including cluster management, workload reliability, and resource optimisation. Own and improve CI/CD pipelines across all services, with particular ownership of frontend application pipelines (build speed, caching, reliability, developer feedback loops). Write and maintain Infrastructure as Code (Terraform) for provisioning and managing cloud resources. Manage and evolve our GitOps workflows (FluxCD) for continuous delivery. Build and improve observability: monitoring, alerting, dashboards, and logging across all services, including frontend-specific observability (error tracking, performance monitoring, Core Web Vitals). Design and maintain the deployment strategy for SPAs and SSR applications, including CDN configuration, cache invalidation, and asset delivery. Build and maintain frontend-specific developer tooling: build configurations, local development environments, preview environments, and service templates. Collaborate with frontend engineers across all delivery pods to understand pain points and reduce friction in their workflows. Establish and maintain golden paths for frontend service creation, ensuring new projects start with sensible defaults for builds, deploys, testing, and monitoring. Manage package management strategy: npm/yarn/pnpm configuration, internal package registries, dependency management, and security scanning. Create and maintain self-service tooling, templates, and golden paths that enable delivery pods to work independently. Respond to infrastructure incidents, participate in on-call rotations, and contribute to post-incident reviews. Write clear documentation and runbooks so other engineers can understand and operate the infrastructure. Support delivery pods with infrastructure queries, troubleshooting, and guidance. Contribute to security hardening, cost optimisation, and capacity planning. Mentor other engineers on frontend build and deployment best practices. Occasionally embed with a delivery pod for a sprint to support a specific initiative. Requirements: Strong understanding of JavaScript/TypeScript build tooling and ecosystems (Webpack, Vite, esbuild, Turbopack, or similar). Experience with npm/yarn/pnpm package management, dependency resolution, and registry configuration. Experience building and optimising CI/CD pipelines for frontend applications (build times, caching strategies, artifact management). Deep understanding of how SPAs are built, bundled, and deployed to production (static hosting, CDN configuration, cache invalidation). Experience with Node.js in a production context (SSR, build servers, tooling). Familiarity with containerising frontend applications and deploying them to Kubernetes. Experience with monitoring and observability for frontend applications (error tracking, performance monitoring, Core Web Vitals). Understanding of CDN configuration, edge caching, and asset delivery optimisation. Comfortable with Linux, shell scripting, and general infrastructure concepts. Experience with Infrastructure as Code (Terraform or similar). Bonus Skills: Experience with Next.js or similar SSR/SSG frameworks in production deployment. Familiarity with monorepo tooling (Nx, Turborepo, or similar). Experience with GitLab CI or similar CI/CD platforms. Understanding of GitOps workflows (FluxCD, ArgoCD). Experience with Kubernetes beyond just deploying frontend apps (general cluster understanding). Familiarity with Cloudflare (Workers, Pages, R2, CDN configuration). Experience with feature flags, A/B testing infrastructure, or canary deployments for frontend. Understanding of accessibility testing and automated visual regression testing in CI. Experience with browser performance profiling and optimisation at the infrastructure level. Familiarity with design systems and component library build/publish pipelines.