Senior Horizon Engineer

As a global market maker, Optiver trades hundreds of thousands of financial instruments on exchanges around the world. By continuously providing quotes – both bids to buy and offers to sell – we play a vital role in the healthy functioning of markets.  

We are looking for a Senior Horizon Engineer to improve and evolve our global, large-scale Omnissa Horizon environment. This is a hands-on, execution-focused role with strong emphasis on platform automation, repeatability, and data-driven decision making. You will be responsible not only for keeping the platform stable, but for improving how it is operated over time through automation, standardization, and evidence-based optimization.

This is a specialist Horizon engineering role, not a generic Modern Workplace position.

What you'll do

• Operate and support production VMware Horizon (Omnissa) environments


• Own and execute Horizon platform upgrades (agents, pods, components) with minimal user impact


• Troubleshoot and remediate performance, stability, and user-experience issues using metrics and evidence, not guesswork


• Diagnose and resolve authentication and login-related issues (AD, GPOs, certificates, SSO, MFA integrations)


• Design and implement repeatable processes using PowerShell-first automation, APIs, and infrastructure-as-code principles where applicable


• Use monitoring and operational data to drive capacity planning, tuning, and remediation decisions


• Work closely with infrastructure, networking, and security teams on cross-domain issues and improvements


• Analyse and address resource contention across compute, memory, storage, network, and vGPU where applicable


• Participate in remediation initiatives related to performance degradation, login latency, session instability, and user-impacting incidents


• Continuously reduce manual operational effort through scripting, standardisation, and platform improvements

Who you are

• A senior, hands-on Horizon engineer with 7+ years of real production experience


• Comfortable taking ownership of both technical outcomes and operational quality


• Experienced in applying automation and infrastructure-as-code thinking to improve reliability and consistency (even if not everything is fully codified)


• Data-driven in how you troubleshoot, optimize and justify changes


• Execution-focused, with a strong bias toward fixing root causes rather than symptoms


• Calm and methodical under pressure, especially during incidents


• Clear communicator who can explain technical decisions using evidence and impact

Who we are

At Optiver, our mission is to constantly improve the market by injecting liquidity, providing accurate pricing, increasing transparency and acting as a stabilizing force no matter the market conditions. With a focus on continuous improvement, we participate in the safeguarding of healthy and efficient markets for everyone who participates. As one of the largest market making institutions, we are a trusted partner of 70+ exchanges across the globe.

What you’ll get

You’ll join a culture of collaboration and excellence, where you’ll be 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, working collectively to tackle the toughest problems in the financial markets.

In addition, you’ll receive:

• A performance-based bonus structure, enabling all of our employees to benefit from our global profit pool.


• The opportunity to work alongside best-in-class professionals from over 50 different countries.


• 25 paid vacation days in your first year, increasing to 30 from your second year onwards.


• Training opportunities, discounts on health insurance, and fully paid first-class commuting expenses.


• Extensive office perks, including breakfast, lunch and dinner, world-class barista coffee, in-house physio and chair massages, organized sports and leisure activities, and Friday afternoon drinks.


• Training and continuous learning opportunities, including access to conferences and tech events.

How to apply

Apply directly via the form below. If you have any questions feel free to contact our Recruitment team via our recruitment inquiry form.

Diversity statement

Optiver is committed to diversity and inclusion.