3rd Line / IT Infrastructure Engineer

Systems Consultant (3rd Line / Infrastructure) - Hybrid Working - £55,000!

Role : Systems Consultant

Location : London (Hybrid – 3 days onsite / 2 days remote)

Salary : £45,000 - £50,000 (DOE)

A highly respected London-based Managed Service Provider is looking for a Systems Consultant / 3rd Line Infrastructure Engineer to join their growing Infrastructure Services team. This role is ideal for an experienced 2nd or 3rd Line Engineer within an MSP who wants to move into a more consultative, customer-facing infrastructure position, working with modern cloud-first and security-led environments. You'll play a key role in supporting and improving client infrastructure while developing deeper expertise across Microsoft cloud, security, and enterprise infrastructure technologies.

The Role

As a Systems Consultant, you’ll operate as a senior escalation point within the infrastructure team, supporting complex technical environments across multiple clients. You’ll work closely with Service Desk, Professional Services, and Account Management teams to ensure the stability, security, and scalability of client IT environments. This position also offers the opportunity to develop into a technical authority or future infrastructure architect within a fast-growing MSP.

Key Responsibilities

• Act as a 3rd line escalation point for complex infrastructure incidents
• Troubleshoot and resolve business-critical technical issues, including root cause analysis
• Support and contribute to major incident management and post-incident reviews
• Deliver proactive infrastructure improvements, including monitoring, patching, and optimisation
• Provide technical oversight for changes, upgrades, and infrastructure improvements
• Contribute to automation, platform standardisation, and service improvements
• Support security posture, backup, business continuity, and disaster recovery solutions
• Develop into a Subject Matter Expert (SME) for key technologies and vendor platforms
• Provide mentorship and guidance to 1st and 2nd Line engineers
• Maintain clear technical documentation and communicate effectively with customers
• Occasional client site visits may be required for workshops, escalations, or technical meetings.

Technical Environment

You’ll be working across modern cloud and infrastructure technologies, including:

• Microsoft 365
• Microsoft Azure (IaaS, identity, networking, security)
• Windows Server
• Active Directory / Entra ID
• Group Policy
• Virtualisation (VMware / Hyper-V)
• Advanced networking (VPNs, routing, switching, firewalls)
• Backup disaster recovery platforms
• Automation scripting
• Cyber security technologies and controls

Experience Required

• 2–3 years in a 2nd / 3rd Line or Infrastructure role
• Experience working within an MSP or multi-client IT environment
• Strong troubleshooting and root cause analysis skills
• Comfortable supporting complex infrastructure environments
• Experience across Microsoft cloud and on-prem infrastructure

Desirable Skills

• Microsoft certifications (e.g. Azure Administrator – AZ-104)
• Experience with Microsoft 365 administration and identity services
• Exposure to AWS or Google Cloud
• Experience with RMM and PSA tools
• Knowledge of backup platforms (e.g. Veeam, Datto)
• Exposure to SIEM / SOC tools
• Understanding of AI tools such as Microsoft 365 Copilot
• Linux administration experience

The client is looking to fill this opportunity immediately, so please apply ASAP or feel free to drop me an email with any questions to owen @ serlimited . com. SER-IN