Senior Infrastructure Engineer

Position Summary The Infrastructure Engineer (L4) is the Hosting team's subject matter expert for VMware NSX-T and platform networking, and a well-rounded engineer across the wider VMware private cloud stack. The role owns NSX-T design standards, escalation and capability uplift within the team, while contributing to the day-to-day engineering and operation of the full private cloud estate — vSphere, vSAN, VCF, backup and disaster recovery — for customers with demanding availability and recovery expectations. Role Mission Claranet’s strategy is to build long term, trusted relationships with customers by delivering secure, resilient, and high quality managed services. The Senior Infrastructure Engineer underpins this mission by ensuring critical infrastructure services are engineered, operated, and evolved to meet stringent regulatory, availability, and recovery expectations. Essential Roles & Responsibilities Infrastructure Engineering Design, implement, and support complex infrastructure solutions across on‑premises, private cloud (VMware) environments including VMware NSX-T Lead planning, execution and disaster recovery activities from a VMware platform and networking perspective. Ensure infrastructure services are available, performant, and operating as designed Support the team to operate enterprise‑grade backup, recovery, and data protection solutions, ensuring alignment with RPO/RTO requirements Senior Technical Leadership Act as the recognised NSX-T authority within the Hosting team Own NSX-T design standards, reference architectures, patterns and build documentation Deliver structured knowledge transfer, training and mentoring to raise NSX-T capability across the team, reducing single-person dependency Represent platform networking in design authority, change advisory and architecture forums Own the NSX-T upgrade and lifecycle roadmap across the estate Act as senior technical escalation points for infrastructure and networking related incidents and changes Lead root cause analysis for major incidents Mentor junior engineers and support skills development across the team Customer Delivery & Engagement Act as a customer‑facing technical lead during complex implementations and migrations Support pre‑sales activities including solution design, validation, and technical assurance Provide confident, credible technical communication to senior customer stakeholders Ensure customer solutions are delivered to time, cost, quality, and regulatory expectations Service Transition & Lifecycle Management Work closely with Project Management and Service Delivery teams to ensure smooth transition into live service. Ensure infrastructure services are fully documented, tested, and operationally ready Support lifecycle activities including upgrades, refreshes, and decommissioning Participate in on‑call rotations and support out‑of‑hours activities where required Continuous Improvement & Product Development Identify and deliver improvements to infrastructure, platforms, tooling, and processes Support product and service development including vendor selection, testing, and operationalisation Maintain and improve documentation, runbooks, and knowledge artefacts Financial Services & Regulatory Compliance Ensure infrastructure and backup services comply with financial services regulations and frameworks (e.g. FCA, PRA, DORA, ISO 27001, SOC) Design and operate solutions that support operational resilience, business continuity, and disaster recovery Maintain audit‑ready documentation, recovery evidence, and control records Support regulatory audits, customer assurance activities, and risk assessments Ensure data protection, encryption, access control, and segregation requirements are met Governance & Reporting Maintain accurate technical documentation, diagrams, and recovery artefacts Contribute to service reporting, risk tracking, and improvement actions Support governance forums, service reviews, and technical design authorities Ensure infrastructure metrics support compliance and assurance needs Position Specifications Behavioural Competencies – Organisational & Behavioural Fit Senior technical presence with confidence and gravitas Calm, methodical, and decisive under pressure Strong sense of ownership and accountability Proactive, improvement‑focused mindset Excellent communicator with technical and non‑technical audiences Willingness to lead from the front and mentor others Critical Competencies – Technical Fit Essential: Proven experience as a senior infrastructure engineer supporting VMware mission‑critical environments Deep, hands-on experience designing, implementing and operating VMware NSX-T / NSX 4.x in production, including Tier-0 and Tier-1 gateways, edge nodes and edge clusters, segments and overlay/VLAN transport zones, and NSX Manager lifecycle and upgrades Distributed Firewall and micro-segmentation policy design, plus gateway firewalling and NAT Dynamic routing and peering between NSX and physical fabric (BGP, ECMP, VRF), and NSX load balancing / IPsec & L2 VPN Troubleshooting overlay networking end to end (Geneve/TEP, MTU, uplink profiles, traceflow, packet capture) Strong understanding of operational resilience, DR, and business continuity requirements Ability to analyse, design, implement, and support solutions to time, cost, and quality targets Excellent written and verbal communication skills, including customer‑facing engagement Relevant technical qualifications or equivalent experience (e.g. VCP-NV, CCNA/CCNP) Desirable: Experience within a managed service provider (MSP) or regulated services environment Automation and infrastructure-as-code for VMware platforms — PowerCLI, Terraform, Ansible or equivalent — and comfort scripting repeatable operational tasks Experience in backup and recovery technologies, including enterprise backup platforms and recovery testing Knowledge of backup platforms such as Veeam, Commvault, Rubrik, or similar Knowledge of Azure and hybrid integration Experience with service transition and ITIL‑aligned delivery models Familiarity with PCI‑DSS and other financial services security standards Advanced technical certifications (e.g. VMware, Cisco, Veeam) Shift & Working Pattern: Standard business hours, with participation in an on call rota (1 in 4, compensated) Occasional weekend engineering coverage will be required, typically limited to a small number of planned weekends per year, to support business continuity, resilience testing, or disaster recovery activities Benefits At Claranet, we go the extra mile with our people—because we believe in building a workplace where everyone feels valued and supported. Our flexible benefits package includes: Pension Scheme: Employer-matched contributions to help you plan for the future. Comprehensive Healthcare Coverage: Access to private medical care for your peace of mind and wellbeing. Discounted Gym Memberships: Prioritise your fitness with exclusive rates at leading gyms. Personalised Wellbeing Support: App-based resources and services available 24/7 Enhanced Annual Leave: 25 days of holiday, increasing to 27 days with service, plus bank holidays and a day off for your birthday. Continuous Learning & Development: Ongoing opportunities to grow your skills and advance your career. What makes us unique is Team Claranet, our internal community that supports causes close to our employees’ hearts. We offer paid charity leave, support local charities across our offices, and host annual fundraising events, all backed by a dedicated committee. We’re proud founding members of TC4RE (Technology Community for Racial Equality) working collectively to build a more diverse and inclusive tech industry. About Claranet Founded at the beginning of the dot com bubble in 1996, our CEO Charles Nasser had a light bulb moment to develop a truly customer-focused IT business. Since then, Claranet has grown from an Internet Service Provider (ISP) in the UK to being one of the leading business modernisation experts, who deliver solutions across 11+ countries. Equal Opportunities Statement Diversity, equity and inclusion are at the heart of what we value as an organisation. Claranet is an equal opportunities employer and all qualified applicants will receive consideration for employment without regard to race, religion, sex, sexual orientation, age, disability or any other status protected by law. Our recruitment team are happy to support any reasonable adjustments that are needed within the recruitment process. Ready to take the next step in your career with Claranet? Click ‘apply’ – we can’t wait to meet you! To view full job description please visit our careers page