{"id":3551491,"url":"https://alion.io/job/claranet-infrastructure-engineer-l4-nsx","title":"Infrastructure Engineer L4 - NSX","company":{"id":51503,"name":"Claranet","domain":"claranet.com","url":"https://alion.io/company/claranet","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"onlyfy","truth_index":null},"role":"DevOps","role_family":"DevOps","seniority":null,"employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["London, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":65000,"max":85000,"currency":"GBP","period":"year","gross":null,"usd_annual":113955},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"BGP","optional":false},{"name":"ISO 27001","optional":false},{"name":"VLAN","optional":false},{"name":"VMWare","optional":false}],"status":"live","first_seen_at":"2026-10-30T16:53:54Z","employer_posted_date":null,"last_verified_at":"2026-10-30T16:53:54Z","board_verified":false,"closed_at":null,"days_open":6,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":6},"description":"Position Summary\nThe 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. \nRole Mission\nClaranet’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. \nEssential Roles & Responsibilities \nInfrastructure Engineering\nDesign, implement, and support complex infrastructure solutions across on-premises, private cloud (VMware) environments including VMware NSX-T\nLead planning, execution and disaster recovery activities from a VMware platform and networking perspective.\nEnsure infrastructure services are available, performant, and operating as designed\nSupport the team to operate enterprise-grade backup, recovery, and data protection solutions, ensuring alignment with RPO/RTO requirements\nSenior Technical Leadership\nAct as the recognised NSX-T authority within the Hosting team\nOwn NSX-T design standards, reference architectures, patterns and build documentation\nDeliver structured knowledge transfer, training and mentoring to raise NSX-T capability across the team, reducing single-person dependency\nRepresent platform networking in design authority, change advisory and architecture forums\nOwn the NSX-T upgrade and lifecycle roadmap across the estate\nLead root cause analysis for major incidents\nFinancial Services & Regulatory Compliance\nEnsure infrastructure and backup services comply with financial services regulations and frameworks (e.g. FCA, PRA, DORA, ISO 27001, SOC)\nDesign and operate solutions that support operational resilience, business continuity, and disaster recovery\nSupport regulatory audits, customer assurance activities, and risk assessments\nPosition Specifications\nBehavioural Competencies – Organisational & Behavioural Fit\nSenior technical presence with confidence and gravitas\nCalm, methodical, and decisive under pressure\nStrong sense of ownership and accountability\nExcellent communicator with technical and non-technical audiences\nCritical Competencies – Technical Fit\nEssential:\nProven experience as a senior infrastructure engineer supporting VMware mission-critical environments\nDeep, 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\nDistributed Firewall and micro-segmentation policy design, plus gateway firewalling and NAT\nDynamic routing and peering between NSX and physical fabric (BGP, ECMP, VRF), and NSX load balancing / IPsec & L2 VPN\nTroubleshooting overlay networking end to end (Geneve/TEP, MTU, uplink profiles, traceflow, packet capture)\nStrong understanding of operational resilience, DR, and business continuity requirements\nShift & Working Pattern:\nStandard business hours, with participation in an on call rota (1 in 4, compensated)\nBenefits\nAt 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: \nPension Scheme: Employer-matched contributions to help you plan for the future.\nComprehensive Healthcare Coverage: Access to private medical care for your peace of mind and wellbeing.\nDiscounted Gym Memberships: Prioritise your fitness with exclusive rates at leading gyms.\nPersonalised Wellbeing Support: App-based resources and services available 24/7\nEnhanced Annual Leave: 25 days of holiday, increasing to 27 days with service, plus bank holidays and a day off for your birthday.\nContinuous Learning & Development: Ongoing opportunities to grow your skills and advance your career.\nWhat 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. \nWe’re proud founding members of TC4RE (Technology Community for Racial Equality) working collectively to build a more diverse and inclusive tech industry. \nAbout Claranet\nFounded 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. \nEqual Opportunities Statement\nDiversity, 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. \nReady to take the next step in your career with Claranet? 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