TRCI-26-05465

Microsoft 365 (Exchange Online & Entra ID) L3 Support / Migration Engineer

Contract role in Brussels for a senior Microsoft 365 engineer providing advanced (Level 3) operational support and technical expertise across Exchange Online and Microsoft Entra ID, with a strong focus on Microsoft 365 tenant migrations, integrations and carve-outs. The engineer acts as a technical reference for collaboration services, performs complex troubleshooting and root cause analysis, supports mailbox lifecycle and mail flow/authentication topics, produces runbooks/procedures, and drives automation/industrialisation (PowerShell) while aligning with internal standards and working with architecture, cybersecurity, identity and operations teams.

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Position summary

Location: Belgium
Workplace: Hybrid
Employment: Contract
Experience: Minimum 7 years and Maximum 10 years

Apply now

Role overview

Why This Role Matters.

Your Impact

Deliver Enterprise Value

Help organisations solve complex business problems through modern technology, consulting expertise and measurable outcomes.

Collaboration

Work Across Teams

Collaborate with consultants, architects, engineers and client stakeholders throughout the project lifecycle.

Growth

Learn Continuously

Gain exposure to enterprise technologies, certifications, mentoring and real-world project experience.

Career Path

Grow With Ubique

Build a long-term consulting career with opportunities to take on greater responsibility and leadership over time.

Responsibilities

What You'll Be Doing.

Every role at Ubique contributes directly to solving meaningful business challenges for our clients.

The mission/role is to provide advanced technical expertise on Exchange Online, Microsoft Entra ID and Microsoft 365 migration activities.

Act as a technical reference within the One Collaboration team, supporting operational teams, local ITs and Group entities while ensuring alignment with ENGIE standards and operational practices.

Provide Level 3 support for complex incidents and requests related to Exchange Online, Entra ID and Microsoft 365 services.

Support operational teams with advanced troubleshooting, root cause analysis and escalation management.

Contribute to service quality improvement, knowledge management and operational governance.

Provide expert knowledge on Exchange Online, Entra ID, identity integrations and Microsoft 365 administration.

Contribute to tenant migrations, carve-outs and integration projects, including assessment, preparation, execution and stabilisation activities.

Support mailbox lifecycle management, mail flow, permissions, authentication and identity-related topics.

Collaborate with architecture, cybersecurity, identity and operational teams on complex technical subjects.

Produce and maintain technical procedures, specifications, runbooks and operational documentation.

Standardise recurring activities and promote best practices across the organisation.

Follow Microsoft roadmap evolutions and assess their operational impact on ENGIE services.

Technology stack

Tools & Technologies.

The platforms and technologies you'll use to build modern, enterprise-grade solutions.

Microsoft 365

Required

M365

Required

Exchange Online

Required

EXO

Required

Microsoft Entra ID

Required

Entra ID

Required

Azure AD

Required

AAD

Required

Identity management

Required

App registrations

Required

OAuth

Required

OpenID Connect

Required

SAML

Required

Conditional Access

Required

Mail flow

Required

Exchange transport rules

Required

MX

Required

SPF

Required

DKIM

Required

DMARC

Required

Requirements

Skills & Experience.

We value curiosity, collaboration and continuous learning. If you don't meet every requirement but believe you can make an impact, we'd still love to hear from you.

Essential

Required Qualifications

Exchange Online administration and troubleshooting (hands-on, L3)

Microsoft Entra ID (Azure AD) advanced knowledge (identity management, app registrations, permissions)

Microsoft 365 administration

Microsoft 365 migrations (tenant migration/integration, carve-outs)

Advanced troubleshooting, root cause analysis, escalation management

Mail flow, mailbox lifecycle management, permissions

Authentication and identity integrations

PowerShell scripting and automation for Microsoft administration

Technical documentation (procedures, runbooks, specifications)

ITSM process familiarity (incident/request/problem)

Fluent English (written and spoken)

Preferred

Nice to Have

ServiceNow familiarity

Microsoft 365 security/governance/compliance understanding

Relevant Microsoft certifications (e.g., Microsoft 365, Entra/Identity)

What you'll gain

More Than Just A Job.

We're committed to helping every team member grow professionally, personally and technically while working on meaningful projects.

Global Exposure

Collaborate with international clients and multicultural teams on enterprise programmes.

Continuous Learning

Expand your expertise through mentoring, certifications and hands-on project experience.

Career Growth

Take ownership, develop leadership skills and grow your consulting career over time.

Flexible Working

Hybrid and remote collaboration designed around trust and delivering exceptional outcomes.

People First

Join a supportive culture where collaboration, respect and long-term relationships come first.

Enterprise Projects

Work on meaningful technology initiatives for leading organisations across industries.

Apply

Apply for Microsoft 365 (Exchange Online & Entra ID) L3 Support / Migration Engineer

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