Principal C# Software Engineer

WHO WE ARE

Optiver is a global market maker founded in Amsterdam, with offices in London, Chicago, Austin, New York, Sydney, Shanghai, Hong Kong, Singapore, Taipei and Mumbai. Established in 1986, today we are a leading liquidity provider, with close to 2,000 employees in offices around the world, united in our commitment to improve the market through competitive pricing, execution and risk management. By providing liquidity on multiple exchanges across the world in various financial instruments we participate in the safeguarding of healthy and efficient markets. We provide liquidity to financial markets using our own capital, at our own risk, trading a wide range of products: listed derivatives, cash equities, ETFs, bonds and foreign currencies.

Optivers Sydney office is one of the primary players within Asian markets, trading a range of products. Established in 1996, we're an active participant on the Hong Kong, Korea, Singapore, Taiwan and Japan exchanges, and act as Optivers APAC head office. 

 WHAT YOU'LL DO

Were looking for a Principal C# Software Engineer to design and build high-performance desktop GUIs that power real-time decision-making across our trading and research teams. In this role, youll develop responsive, Windows-based interfaces that surface complex data clearly and intuitively. Youll work closely with traders, researchers, and backend engineers to translate sophisticated requirements into elegant, high-performance visualisations. Your work will directly impact trading performance and operational efficiency, delivering reliable applications that handle real-time data at scale while maintaining exceptional responsiveness and usability.

Responsibilities:

• Design, build, and maintain high-performance Windows desktop applications using C# and modern .NET

• Develop intuitive, responsive UIs for real-time and complex data visualisation

• Collaborate with traders, researchers, and engineers to translate requirements into effective tools

• Own features end-to-end, from design through to deployment and monitoring

• Ensure performance and reliability through strong architecture, async programming, and optimisation

• Diagnose and resolve issues related to performance, threading, and memory

• Contribute to shared UI components, frameworks, and engineering best practices

• Continuously improve usability, workflows, and overall user experience

WHO YOU ARE

We need our next engineer to be someone with:

• Strong proficiency in C# and .NET, with 7+ years experience building production desktop applications

• Experience developing responsive, high-performance UIs using WPF, WinForms, XAML, or similar

• Solid understanding of MVVM (or similar patterns), UI architecture, asynchronous programming, and threading

• Experience debugging, profiling, and optimising desktop applications (e.g. memory usage, concurrency, rendering performance)

• A strong problem-solving mindset with a focus on performance, scalability, and reliability

• Ability to work independently, lead projects, and prioritise effectively

• Strong communication skills across both technical and non-technical audiences

• A Bachelors or Masters degree in Computer Science or a related field

WHAT YOU'LL GET

Youll join a culture of collaboration and excellence, where youll be surrounded by curious thinkers and creative problem solvers. Driven by a passion for continuous improvement, youll thrive in a supportive, high-performing environment alongside talented colleagues, working collectively to tackle some of the most complex problems in the financial markets.

In return for your expertise, you will have access to a range of Optiver perks, including:

• A performance-based bonus structure unmatched anywhere in the industry. We combine our profits across desks, teams and offices into a global profit pool, fostering a truly collaborative environment

• The chance to work alongside diverse and intelligent peers in a rewarding environment

• Training, mentorship and personal development opportunities

• Daily breakfast, lunch and an in-house barista

• Gym membership plus weekly in-house chair massages

• Regular social events, including a company trip every two years

• Guided relocation, a competitive relocation package and visa sponsorship where necessary

Optiver is committed to

Questions? Get in touch with the recruitment team at