Infrastructure Engineer L4 - NSX

Claranet; City Of London; On-site; GBP 65,000 - 95,000; Full time

Benefits offered by this job

Pension Scheme

Healthcare Coverage

Discounted Gym Memberships

Wellbeing Support

Enhanced Annual Leave (25–27 days)

Job summary

Claranet is seeking a Senior Infrastructure Engineer (L4) to lead NSX‑T design standards and the day‑to‑day operation of our private cloud stack, including vSphere, vSAN, and DR capabilities. You will own the NSX‑T roadmap, drive upgrades, and mentor the team while ensuring high availability and regulatory compliance.

The role combines hands‑on engineering with technical leadership, requiring a calm, accountable, and communicative approach to complex incidents and change drives within a

Qualifications

• Proven senior infrastructure engineer in VMware environments.
• Deep hands-on NSX-T 4.x production experience.
• Experience designing, implementing and operating private cloud platforms.
• Strong understanding of DR, RPO/RTO and business continuity.

Responsibilities

• Design, implement, and support complex infrastructure solutions across on‑premises and 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.
• Provide knowledge transfer and mentoring to raise NSX‑T capability across the team.

Skills

VMware NSX-T

vSphere/vSAN

Platform networking

Disaster recovery

Root cause analysis

Technical leadership

Incident response

On-call readiness

Job description

Full job description

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
• Lead root cause analysis for major incidents

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
• Support regulatory audits, customer assurance activities, and risk assessments

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
• Excellent communicator with technical and non-technical audiences

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

Shift & Working Pattern:

• Standard business hours, with participation in an on call rota (1 in 4, compensated)

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.