Senior C# UI Engineer – Trading Systems Amsterdam • Optiver

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Optiver is seeking a Senior C# UI Engineer to help shape the next generation of our global trading and research interfaces. This is a hands-on technical leadership role focused on building performant, intuitive, and scalable user interfaces that interact seamlessly with our C++-based backend microservices.

Our UIs are built using an in-house, high-performance C# framework that abstracts much of the complexity of our systems, enabling developers to rapidly build robust tools for traders and researchers. Your role will be to both leverage and extend this framework — working at the intersection of C#, C++, and real-time data to deliver world-class applications.

You will collaborate closely with developers, traders, and quantitative researchers to understand their workflows, design effective user experiences, and ensure reliability and speed in a low-latency trading environment.

WHAT YOU’LL DO

• Design and build high-performance UI applications using C# on top of Optiver’s proprietary in-house framework.

• Extend and enhance the UI framework itself to improve usability, performance, and flexibility for other developers.

• Integrate with complex C++ backend microservices, ensuring efficient communication, real-time data handling, and consistent APIs.

• Architect scalable and modular UI components that handle large data volumes and update in real time.

• Collaborate closely with traders, researchers, and engineers to design solutions that improve decision-making speed and reliability.

• Lead and mentor engineers, contributing to code quality, design reviews, and engineering best practices.

• Drive innovation in performance optimization, architecture, and tooling to further simplify and scale our UI development ecosystem.

WHO YOU ARE

• Expertise in C# / .NET with a strong track record of building high-performance desktop applications (e.g., WPF, WinForms, or custom frameworks).

• Strong understanding of C++ and ability to interoperate effectively with C++ services and APIs.

• Proven experience designing and maintaining complex software frameworks and modular UI systems.

• Deep understanding of multithreading, concurrency, and real-time data processing.

• Demonstrated ability to lead technical initiatives, guide other developers, and make sound architectural decisions.

• Strong problem-solving skills and ability to operate effectively in a fast-paced, highly collaborative environment.

• Experience in financial systems or real-time data applications is advantageous but not required — excellence in performance and scalability is what matters most.

While not required, experience in the following areas would be a plus:

• Contributing to internal developer tools, frameworks, or SDKs used across teams.

• Designing low-latency data visualizations or working with distributed systems and networked applications.

• Hands-on experience with C++/CLI, inter-process communication (IPC), or native interop between C# and C++.

• Familiarity with trading systems, quantitative research platforms, or real-time analytics applications.

Some interesting blogs

• Performance challenges as a C# Engineer at Optiver
• Data Visualisation at Optiver

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.

• Competitive relocation packages and visa sponsorship where necessary for expats.

HOW TO APPLY

Are you interested in furthering your career on one of the most dynamic and exciting trading floors in Europe?

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

Please note:

• We do not require any assistance from third-parties including agencies in the recruitment of this role

• We cannot accept applications via email’

DIVERSITY STATEMENT

Optiver is committed to diversity and inclusion.