Principal C# Software Engineer - High Performance Trading Technology

A leading global proprietary trading firm is looking for a Principal C# Software Engineer to join its high-performance engineering team in Sydney .

This role sits at the intersection of trading, real-time systems, and desktop engineering - focused on building sophisticated front-office applications used directly by traders and researchers across global financial markets. You’ll design and develop high-performance Windows desktop applications that visualise large volumes of real-time market and trading data with exceptional speed, responsiveness, and usability.

You will:

• Build modern C# / .NET desktop applications powering real-time trading workflows

• Develop responsive UI and visualisation tools for complex market data

• Work closely with traders, quantitative researchers, and eng ineers

• Own projects end-to-end from design through deployment

• Optimise systems for performance, scalability, threading, and reliability

• Influence UI frameworks, engineering standards, and architecture decisions

What They’re Looking For

• 7+ years of C# / .NET engineering experience

• Strong desktop UI development experience (WPF, WinForms, XAML, etc.)

• Strong understanding of async programming, threading, MVVM, and performance optimisation

• Experience building highly responsive, production-grade applications

• Excellentproblem-solving and communication skills

• Ability to operate independently in fast-moving environments

Why Join?

1. This is an opportunity to join one of the world’s most sophisticated trading technology environments, working on systems that directly impact live trading performance across global markets.
2. The firm offers a highly collaborative engineering culture, strong technical ownership, excellent compensation, and the opportunity to work alongside some of the strongest technologists and quantitative professionals in the industry.
3. Sydney-based role with relocation support available for the right candidate.

If you’re interested in learning more about this firm and role, please apply today with a copy of your resume or a link to your LinkedIn profile, for a chance to learn more!

BAH Partners specialize in placing the leading technology and quantitative talent into Asia Pacific’s premier financial and technology-driven organizations. If you would like more information, or to confidentially discuss your career options, please contact me at [email protected]

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