C# Developer - Trading Technology

Selby Jennings; Sydney; On-site; AUD 140,000 - 190,000; Full time

Job summary

Selby Jennings is seeking a Senior C# Developer to join a core trading technology group building server-side and desktop applications for front-office users in Sydney. You will partner with traders, researchers and engineers to deliver reliable software for trading analytics, market data, monitoring and real-time communication.

You should have a strong background in C# and the .NET ecosystem, experience with desktop and server-side development, and a passion for performance, reliability and

Qualifications

• Strong experience in C# and the .NET ecosystem.
• Experience with server-side and desktop applications.
• Solid object-oriented design and profiling knowledge.
• Experience delivering multithreaded, high-performance systems.
• Ability to communicate with technical and non-technical stakeholders.
• Bachelor's degree or higher in a technical field.

Responsibilities

• Design, develop and maintain C# applications for live trading.
• Build reliable server-side services and desktop interfaces.
• Own projects across the full development lifecycle.
• Collaborate with traders and researchers to implement solutions.
• Improve availability, performance and maintainability.
• Evaluate technologies and contribute to engineering practices.
• Support a high-performing engineering culture through code reviews and mentoring.

Skills

C#

.NET

Multithreading

OO Design

Performance

Communication

Education

Bachelor's degree in CS or related

Tools

WPF

Linux

React/TypeScript

Job description

Senior C# Developer, Core Trading Technology

Company Overview

A leading global quantitative trading firm is expanding its technology capability in Australia. The business brings together software engineers, quantitative researchers and traders to develop sophisticated systems supporting activity across global financial markets.

The environment is highly technical, collaborative and engineering-led. Teams work closely with front-office users, operate with a strong sense of ownership and solve complex problems where software quality, availability and responsiveness are critical.

Role Overview

This position will join a core trading technology group responsible for applications used throughout the front-office trading environment. You will design and develop server-side systems and desktop interfaces, partnering directly with traders, quantitative researchers and fellow engineers to deliver reliable software supporting trading analysis, market data, monitoring and real-time communication.

Key Responsibilities

• Design, develop and maintain business-critical C# applications used within a live trading environment.
• Build reliable server-side services and intuitive desktop user interfaces.
• Own projects across the full development lifecycle, from requirements analysis and technical design through testing, deployment and production support.
• Work directly with traders and quantitative researchers to translate complex requirements into practical technology solutions.
• Enhance systems supporting trading analytics, market and reference data, trade monitoring and real-time messaging.
• Improve application availability, performance and maintainability through sound engineering, automation and tooling.
• Evaluate relevant technologies and contribute to the ongoing evolution of the team's development practices.
• Support a high-performing engineering culture through collaboration, code reviews and mentoring.

Key Requirements

• Strong professional experience developing applications in C# and the .NET ecosystem.
• Experience with both server-side development and client-side or desktop applications.
• Solid knowledge of object-oriented design, software architecture and application profiling.
• Practical experience building concurrent or multithreaded systems.
• Understanding of performance, reliability and operational considerations for business-critical applications.
• Experience taking software through the complete development lifecycle.
• Strong analytical ability and excellent attention to detail.
• Confident communication skills, with the ability to work effectively with technical and non-technical stakeholders.
• Ability to deliver high-quality work in a fast-moving, time-sensitive environment.
• Bachelor's degree or higher in computer science, engineering or another relevant technical discipline.
• Experience supporting or mentoring less-experienced engineers.

Nice to Have

• Experience with WPF or another modern desktop user-interface framework.
• Knowledge of web technologies such as HTML, JavaScript, React or TypeScript.
• Experience deploying modern .NET applications into Linux environments.
• Exposure to low-latency, event-driven or real-time messaging systems.
• Previous experience in trading, financial markets or another performance-sensitive environment.

Location & Work Setup

Sydney, Australia. The role works closely with front-office and engineering stakeholders, so regular office-based collaboration is expected. Specific flexibility can be discussed during the recruitment process.

Why Join

• Build technology that has direct and visible impact on front-office decision-making.
• Work on technically challenging systems where performance, resilience and accuracy matter.
• Collaborate directly with experienced engineers, quantitative researchers and traders.
• Take meaningful ownership across design, delivery and production outcomes.
• Join a well-supported environment offering competitive compensation, comprehensive benefits and opportunities for continued technical growth.

Desired Skills and Experience

This position will join a core trading technology group responsible for applications used throughout the front-office trading environment. You will design and develop server-side systems and desktop interfaces, partnering directly with traders, quantitative researchers and fellow engineers to deliver reliable software supporting trading analysis, market data, monitoring and real-time communication.