C# Developer - Trading Technology - Leading HFT

Senior C# Developer - Trading Technology

Company Overview:

Our client is a leading global quantitative trading and technology-driven investment firm with a strong presence across international financial markets.
The firm combines advanced technology, quantitative research, and trading expertise to develop sophisticated systems that support complex trading strategies. Known for its collaborative culture and flat structure, the business offers engineers direct exposure to front office stakeholders and the opportunity to make a measurable impact.

Role Overview:

An experienced C# Developer is sought to join a front office trading technology team based in Sydney. This role will focus on designing, building, and supporting business-critical applications used by traders, quantitative researchers, and technology teams. The position offers exposure to both server-side systems and user-facing applications within a fast-paced trading environment.

Key Responsibilities:

• Design, develop, and maintain business-critical trading and market-data applications.
• Partner closely with traders, quantitative researchers, and engineers to gather requirements and deliver solutions.
• Build highly available and scalable systems supporting real-time trading workflows.
• Develop both backend services and desktop user interfaces.
• Own the full software development lifecycle, from analysis and design through to production deployment and support.
• Drive improvements in system performance, reliability, automation, and operational efficiency.
• Contribute to technical architecture and engineering best practices.
• Mentor junior engineers and support the growth of the wider development team.

Key Requirements:

• Bachelor's degree or higher in Computer Science, Engineering, Mathematics, or a related technical discipline.
• Strong commercial experience developing applications in C#/.NET.
• Experience building high-performance server-side systems, ideally including multi-threaded development.
• Experience developing desktop applications, preferably using WPF or similar frameworks.
• Solid understanding of object-oriented design principles and software engineering best practices.
• Experience working across the full software development lifecycle.
• Strong communication skills with the ability to collaborate directly with front office stakeholders.
• Ability to thrive in a fast-moving, high-performance environment.
• Experience troubleshooting, profiling, and optimising application performance.
• Strong attention to detail and commitment to software quality.

Nice to Have:

• Experience with .NET Core and Linux-based deployments.
• Knowledge of HTML, JavaScript, or modern web development frameworks.
• Experience with React and/or TypeScript.
• Exposure to real-time distributed systems or messaging technologies.
• Previous experience within trading, capital markets, or financial technology environments.
• Agile software delivery experience.

Location & Work Setup:

Sydney, Australia
Primarily office-based, working closely with traders, researchers, and engineering teams in a highly collaborative environment.

Why Join:

• Work directly alongside traders and quantitative researchers on business-critical technology.
• Gain exposure to complex, real-time systems operating in global financial markets.
• Join a highly technical and collaborative engineering culture.
• Influence architecture, technology decisions, and product direction.
• Strong compensation, benefits package, and long-term career growth opportunities.
  

Desired Skills and Experience

An experienced C# Developer is sought to join a front office trading technology team based in Sydney. This role will focus on designing, building, and supporting business-critical applications used by traders, quantitative researchers, and technology teams. The position offers exposure to both server-side systems and user-facing applications within a fast-paced trading environment.