3rd Line Infrastructure Engineer

🔒 Confidential Employer
Posted 19 March 2026
LOCATION
London
TYPE
Full-time
LEVEL
Mid-Senior level
SALARY
£55,000 / year
CATEGORY
IT Infrastructure
This employer holds a UK Home Office sponsor license — sponsorship for this specific role is at the employer’s discretion

SKILLS

M365 Azure IaaS PaaS Cyber Security Networking Infrastructure

FULL DESCRIPTION

3rd Line Infrastructure Engineer

London/hybrid. to £55k + benefits

This is a great opportunity to join an award-winning IT Managed Service Provider with a 20+ year track record and ambitious growth plans. The company provides cloud-first, secure solutions and services, primarily using Microsoft products, and has a fantastic client base across a wide range of industries.

Third Line Infrastructure Engineer - the opportunity

This is a great opportunity to join an award-winning IT Managed Service Provider with a 20+ year track record and ambitious growth plans.  The company provides cloud-first, secure solutions and services, primarily using Microsoft products, and has a fantastic client base across a wide range of industries.

This role sits in a talented Infrastructure team and would be a great platform for someone with 3rd-line support experience to take on more consulting-led responsibilities and to progress their career path towards a senior technical consulting or architecture role.

The company is committed to supporting professional growth and development and this role will present great opportunities to sharpen your technical expertise, particularly in cloud and security technologies.

Third Line Infrastructure Engineer - responsibilities

  • Act as 3rd-line point of escalation for complex and business-critical incidents
  • Take ownership of major/critical incidents, including post-incident review
  • Support onboarding of new clients and contribute to proactive service delivery
  • ​Contribute technical oversight for improvements and changes
  • Develop subject matter expertise in selected products, working closely with vendors
  • Consult internally on new product developments
  • Support and mentor engineers from 1st & 2nd line team
  • Communicate clearly with internal and external stakeholders
  • Maintain high quality technical documentation

Third Line Infrastructure Engineer - requirements

  • Experience in an IT Managed Service Provider environment (essential)
  • Track record in complex multi-client or multi-site environments
  • Very strong analytical and problem-solving skills.
  • Excellent knowledge of Microsoft products including M365 and Azure
  • Strong Cloud skills - IaaS, PaaS etc
  • Good understanding of cyber security principles
  • Strong networking and infrastructure skills
  • Microsoft certifications would be beneficial as would AI tools (Copilot) experience

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To find out more or for an informal  chat in confidence, please get in touch: [contact hidden]; [contact hidden]

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