Lead Site Reliability Engineer

London, Waterloo (Hybrid, 4 days in-office - Wednesday is our set work from home day, though you can come in on Wednesday too if you wish) We are disrupting one of the world's largest asset classes, property. With £2Bn+ assets on our platform and 30,000+ users across 70 countries, we're building the future of asset ownership and in doing so, are able to address wealth inequality. Our product simplifies property investing from start to finish, making real estate investment accessible to everyone. WHAT YOU'LL LOVE DOING: - Working in cross-functional product teams, taking infrastructure and reliability initiatives from concept to production. - Navigating ambiguity in a fast-moving environment where ownership and freedom are core to how we operate. - Building and maintaining robust, scalable infrastructure across our GCP cloud environment. Working with Kubernetes, Terraform, Cloudflare, and modern observability tooling to ensure our platform runs smoothly. - Collaborating closely with engineering teams to design CI/CD pipelines, improve deployment practices, and champion reliability as a core engineering principle. - Helping to define SRE practices for a high-growth fintech platform. Mentoring other engineers as we scale our teams and impact. WHAT YOU'LL BE DOING: - Designing, implementing, and maintaining our cloud infrastructure on Google Cloud Platform (GCP), ensuring scalability, reliability, and security. - Owning our Kubernetes clusters and containerization strategy - from Docker image optimization to cluster management and deployment orchestration. - Building and evolving our Infrastructure as Code using Terraform, creating modular, testable, well-documented configurations that scale with our rapid growth. - Managing and optimizing our Cloudflare infrastructure, including Workers for edge computing, DNS, CDN, security policies, and performance optimization. - Deploy AI powered product features in isolated and secure serverless environments. - Implementing comprehensive monitoring and observability using Prometheus and Grafana, defining SLIs/SLOs, and proactively identifying issues before they impact users. - Designing and maintaining CI/CD pipelines with appropriate quality gates, testing strategies, and deployment techniques (blue-green, canary) to enable fast, safe releases. - Ensuring security best practices across our infrastructure - from network design and access controls to secrets management and vulnerability scanning. - Working with engineering teams to improve application reliability, performance, and observability through instrumentation and architectural guidance. - Enabling developer productivity through self-service tooling, clear documentation, and automation of operational tasks. WHAT WE'RE LOOKING FOR: Essential: - 5+ years in SRE, DevOps, or platform engineering roles with production-grade infrastructure experience - Strong hands-on experience with Google Cloud Platform (GCP) - Expert-level knowledge of Kubernetes and Docker - you've deployed, managed, and troubleshot production clusters - Proficiency in Terraform for infrastructure as code - Experience with Cloudflare services, including Workers, DNS, CDN, and security features - Experience implementing and managing observability stacks with Prometheus and Grafana - Strong understanding of CI/CD principles, pipeline design, and deployment strategies - Experience with cloud networking, security groups, VPCs, and network peering - Solid scripting skills (Shell, Python, or similar) Desirable: - Experience with blue-green or canary deployment techniques - Familiarity with programming languages like Go or TypeScript - Background in implementing security automation and quality gates - Experience with configuration management tools - Understanding of SRE principles: SLIs, SLOs, error budgets, and blameless postmortems - Experience with edge computing and serverless architectures - Track record of mentoring engineers and fostering a culture of reliability What w