At a Glance
- Tasks: Design and support complex infrastructure solutions using VMware NSX-T in a dynamic environment.
- Company: Join Claranet, a leading IT business focused on customer relationships and innovative solutions.
- Benefits: Enjoy flexible benefits, including healthcare, gym discounts, and enhanced annual leave.
- Other info: Be part of a diverse team committed to community support and continuous learning.
- Why this job: Make a real impact in a role that combines technical expertise with leadership opportunities.
- Qualifications: Experience with VMware NSX-T and a strong understanding of infrastructure engineering required.
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.
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
- 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.
Ready to take the next step in your career with Claranet? Click ‘apply’ – we can’t wait to meet you!
Infrastructure Engineer L4 - NSX in London employer: Claranet Limited Careers
As a leading employer in the cybersecurity sector, we pride ourselves on fostering a collaborative and innovative work culture that empowers our SOC Automation Engineers to thrive. Located in a vibrant tech hub, we offer competitive benefits, continuous professional development opportunities, and a commitment to work-life balance, ensuring our employees can grow their careers while making a meaningful impact in enhancing security for our clients.
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We think you need these skills to ace Infrastructure Engineer L4 - NSX in London
Some tips for your application 🫡
Show off your coding skills:When applying for a software engineering role, it's super important to showcase your coding skills. Make sure your CV includes your tech stack, any relevant programming languages you’re comfortable with, and examples of projects you've worked on. If you have a GitHub profile, link it up! We love to see code in action.
Tailor your portfolio:For a full-time role, we’d expect to see some solid examples of your work in your portfolio. Make sure to include at least two or three projects that highlight your problem-solving skills and your ability to work with different technologies. Focus on the projects that are most relevant to the position at Claranet Limited Careers.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at Claranet Limited Careers and how your skills align with the role. Show us your passion for software development. We dig enthusiastic candidates who understand the value of collaboration and continuous learning!
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How to prepare for a job interview at Claranet Limited Careers
✨Brush Up on Your Coding Skills
For a full-time software engineering role, it's crucial that we stay sharp with our coding abilities. Expect technical questions that might involve solving problems on the spot or discussing algorithms. Practise on platforms like LeetCode or HackerRank to get comfortable with the types of questions that often come up.
✨Know Your Tools and Frameworks
Make sure we’re well-acquainted with the tools and technologies listed in the job description. Familiarise ourselves with any specific frameworks or programming languages mentioned. If Claranet Limited Careers uses React or Node.js, for instance, be ready to discuss how we’ve used them in previous projects or coursework.
✨Showcase Your Projects
Bring along a portfolio that highlights our best work. This could be code samples, GitHub repositories, or any side projects we’ve built. Make sure we can talk through our thought process for each project, especially the challenges we faced and how we solved them—this shows our problem-solving skills in action.
✨Prepare for Behavioural Questions
While technical skills are key, full-time positions also require cultural fit. Be ready to discuss our previous experiences and how we handle teamwork, conflict, and deadlines. Brush up on the STAR method—Situation, Task, Action, Result—to clearly articulate our past experiences when discussing how we've contributed to a team.
