Senior Infrastructure Engineer

83zero Ltd; Gloucester; Hybrid; GBP 70,000 - 95,000; Full time

Job summary

83zero Ltd. is seeking a Senior Infrastructure Engineer to drive Microsoft Modern Workplace & Security across varied customer environments. You will lead complex projects, design secure Microsoft ecosystems, and mentor engineers while engaging with customers at both business and technical levels.

The role emphasizes hands-on engineering with a focus on Defender, Purview, Sentinel, and zero-trust principles, including remediation, standardization, and automation using PowerShell.

Qualifications

• Strong Microsoft 365 engineering experience.
• Entra ID / Intune / Endpoint Security expertise.
• Experience in MSP or multi-customer environments.
• Microsoft security tooling experience.
• Certifications MS102 / MD102 / SC / AZ desirable.

Responsibilities

• Lead complex technical projects and escalations.
• Design secure Microsoft environments and reference architectures.
• Improve engineering standards and service quality across engagements.
• Mentor engineers and share best practices.
• Support migrations and modern workplace transformations for clients.
• Work directly with customers at business and technical levels.

Skills

Microsoft 365 engineering

Entra ID

Intune

Endpoint Security

PowerShell

Automation

Customer-facing consulting

Tools

Defender

Purview

Sentinel

Job description

Senior Infrastructure Engineer - Modern Workplace & Security

Gloucestershire (Hybrid)

Looking for a genuinely strong Microsoft Modern Workplace & Security Engineer who wants to work across complex customer environments, influence technical direction, and operate as a trusted technical advisor.

This is a hands‑on senior engineering role with a strong focus on:

• Microsoft 365 architecture & optimisation
• Entra ID & Conditional Access
• Intune & Endpoint Management
• Microsoft Security stack (Defender / Purview / Sentinel)
• Zero Trust & secure design principles
• Tenant remediation & standardisation
• Copilot, SharePoint & collaboration tooling
• PowerShell & automation
• Customer‑facing consulting & technical leadership

You’ll be:

• Leading complex technical projects & escalations
• Designing secure Microsoft environments
• Improving engineering standards & service quality
• Mentoring engineers & sharing best practice
• Supporting migrations & modern workplace transformations
• Working directly with customers at both business & technical levels

Ideal background:

• Strong Microsoft 365 engineering experience
• Entra ID / Intune / Endpoint Security expertise
• Experience in MSP or multi-customer environments
• Microsoft security tooling experience
• Comfortable leading conversations with customersMS102 / MD102 / SC / AZ certifications highly desirable