Senior Microsoft 365 Engineer

Optiver's Global Enterprise Clients team owns the global Microsoft 365 platform — collaboration, messaging, identity, and mobile access — that our entire worldwide workforce runs on every day. It's treated as critical production infrastructure, not a back-office system. You'll join an established, distributed group of senior Microsoft 365 engineers spread across our global offices, operating a single global platform, in a hands-on role with real architectural influence: engineers here design solutions, validate them with peers, and implement them directly. Observability, continuous capability uplift, CI-driven change, and self-healing automation are central to how we keep this platform reliable at scale.

What you'll do

·Set direction and design standards for our global Microsoft 365 platform across collaboration, messaging, identity, and device access

Lead arcitectural decisions end-to-end — design, peer validation, implementation — driving change from inception through global rollout and adoption, with full ownership of global deliverables

Drive systemic simplification, reducing legacy patterns, hybrid complexity, and accidental architecture

Define and operate our collaboration and content platforms, including information architecture, governance, permissions, and lifecycle management

Own enterprise messaging architecture, including global mail flow, routing, hybrid integration, and coexistence

Architect identity and access foundations, covering authentication models, access control, lifecycle management, and hybrid integration

Define and own mobile access architecture for iOS and Android

Architect the Azure foundations that support Microsoft 365, identity, automation, monitoring, and remediation

Treat observability as non-negotiable — design deep monitoring, alerting, and telemetry, using tooling that surfaces systemic risk and informs decisions

Own BAU operations for the platform, including incidents, degradations, change execution, and continuous improvement

Design, implement, and operate self-healing automation that closes the loop between detection, remediation, and prevention

Build and maintain production-grade automation using industry-standard tooling, including AI-assisted development where it accelerates delivery without reducing ownership

What you'll get

You'll join a culture of collaboration and excellence, surrounded by curious thinkers and creative problem-solvers. Motivated by a passion for continuous improvement, you'll thrive in a supportive, high-performing environment alongside talented colleagues, collectively tackling some of the toughest challenges in the financial markets.

In addition, you'll receive:

The opportunity to work alongside best-in-class professionals from over 40 different countries

Highly competitive compensation package, including a global profit-sharing pool and performance-based bonus structure

401(k) match up to 50%

Comprehensive health, mental, dental, vision, disability, and life coverage

25 paid vacation days alongside market holidays

Extensive office perks, including breakfast, lunch and snacks, regular social events, clubs, sporting leagues and more

Who you are

7+ years' experience as a senior Microsoft 365 engineer or architect, owning and operating mid-to-large enterprise platforms

Deep hands-on expertise in SharePoint Online platform engineering and Exchange Online mail flow, including hybrid scenarios

Strong command of identity and access architecture, including Entra ID / Azure AD and Entra ID Connect (Conditional Access, tenant restrictions, B2B, RBAC, enterprise apps, service principals, app proxy)

Proven track record simplifying complex hybrid environments

Strong PowerShell engineering skills and comfort with Microsoft Graph, Azure CLI, Terraform, and GitHub-based Infrastructure-as-Code workflows

Highly proficient with Log Analytics and KQL

Comfortable designing and operating Azure resources — policies, subscriptions, workbooks, storage accounts, VNETs, Traffic Manager

Experience defining and owning MDM/Intune policy and configuration for iOS and Android, across both BYOD and corporate-managed settings

Comfortable debating architecture with senior peers and backing decisions with data

A clear, trusted communicator and technical mentor who raises the bar for others

Thrives in a high-ownership, continuous-improvement environment, with demonstrated experience owning initiatives end-to-end — from conception through implementation, rollout, skills transfer, and sustained operation

Able to autonomously run and deliver global projects across a distributed team and time zones, and drive change without heavy oversight

Experience that helps

Tertiary qualification in Computer Science or a related field; recent (~3 years) Microsoft certification in Azure or M365

Background in an enterprise environment with heavy Microsoft platform adoption — Financial Services, Logistics & Transportation, Resources & Mining, Big Tech/SaaS/Cloud, or as a Managed Service Provider or Microsoft integration partner — particularly in large-user-base, campus-style environments

Prior experience at Principal Consultant or Architect level, in presales design and engineering, or in project management

Exposure to Microsoft 365 Defender and threat protection, Purview or advanced compliance tooling, Logic Apps/Power Automate/workflow platforms, or building and maintaining AI Copilot agents

Experience in a trading firm or other ultra-low-tolerance production environment

Who we are

At Optiver, our mission is to improve the market by injecting liquidity, providing accurate pricing, increasing transparency and stabilising the market no matter the conditions. With a focus on continuous improvement, we prioritise safeguarding the health and efficiency of the markets for all participants. As one of the largest market making institutions, we are a respected partner on 100+ exchanges across the globe.

Our differences are our edge. Optiver does not discriminate on the basis of race, religion, color, sex, gender identity, sexual orientation, age, physical or mental disability, or other legally protected characteristics.