Lead C# Developer - Core Trading Technology

Susquehanna International Group; Sydney; On-site; AUD 180,000 - 250,000; Full time

Job summary

Susquehanna International Group in Sydney, NSW, seeks a Lead C# Developer for Core Trading Technology. You will lead analysis, design and development in a fast-paced front office trading environment, while mentoring a team of engineers and remaining hands-on in technical direction.

The role covers server-side systems and UI development, working with traders, quants and technology teams to deliver reliable, high-performing software.

Qualifications

• Bachelor's degree or higher in a technical or related discipline.
• 10+ years of C# experience across server-side systems with strong multi-threading and UI development.
• Proven experience leading or managing a development team, including mentoring engineers.
• Deep knowledge of software design, OO principles, profiling and performance tuning, multi-threading, and UI development on both client and server sides.
• Track record of delivering complex, business-critical systems through full SDLC, ideally in Agile environments.
• Strong interpersonal and communication skills with traders, quants, developers and senior management.
• Ability to meet deadlines and make decisions under pressure in a fast-paced environment.
• Excellent attention to detail and accuracy.

Responsibilities

• Lead and manage a team of developers, setting priorities, allocating work and removing blockers.
• Mentor and coach junior and mid-level developers through code reviews and career development.
• Contribute to hiring, onboarding and performance feedback.
• Own the analysis, design and development of business-critical applications from requirements to production release.
• Set technical direction and architecture standards for performance and resilience.
• Uphold engineering best practices including code quality, testing, CI/CD and operability.
• Remain hands-on for prototyping, complex multi-threading and critical code reviews.
• Partner with traders, quants and technology stakeholders to understand needs and communicate status.

Skills

C# programming

Multi-threading

Leadership

Mentoring

UI development

Agile

Education

Bachelor's degree in a technical field

Tools

WPF

.NET Core

Linux deployment

Tibco RV

Job description

Lead C# Developer - Core Trading Technology

Susquehanna International Group – Sydney NSW

As a C# Lead Developer in the Core Trading Technology team, you will lead the analysis, design and development of applications in a Front Office trading environment. The software spans server-side systems and user interfaces. You will manage and mentor a team of developers while remaining hands‑on in the technical direction of the platform. You will work closely with traders, quantitative researchers and technology teams to turn requirements into reliable, high‑performing software covering almost all aspects of the trading environment.

The Sydney Core Trading Technology team owns a rich mix of proprietary software focused on highly available applications, including trading analysis tools, market and static data feeds, trade monitoring and real‑time messaging, all used to support trading decisions.

Responsibilities

Leadership and people

• Lead and manage a team of developers, setting priorities, allocating work and removing blockers.
• Mentor and coach junior and mid-level developers through code reviews, pairing, and career development.
• Contribute to hiring, onboarding, performance feedback and succession planning.
• Foster a high‑performing, collaborative and accountable engineering culture.

Technical delivery

• Own the analysis, design and development of business‑critical applications, from requirements gathering through to production release and support.
• Set technical direction and architecture standards, and make sound design trade‑offs across performance, resilience and maintainability.
• Establish and uphold engineering best practice, including code quality, testing, profiling, CI/CD and operational readiness.
• Remain hands‑on where it matters: prototyping, tackling complex multi‑threading and performance problems, and reviewing critical code.

Stakeholders and improvement

• Partner with traders, quants and senior technology stakeholders to understand needs, set expectations and communicate delivery status and risks.
• Drive continuous improvement of the team’s capability and applications through technology, automation and process.
• Stay curious about new technologies and assess where they can add value to the trading platform.

Essential qualifications and experience

• Bachelor’s degree (or higher) in a technical or related discipline.
• 10+ years of C# experience across server‑side systems (with strong multi‑threading) and client‑side development.
• Proven experience leading or managing a development team, including mentoring junior engineers and developing talent.
• Deep knowledge of software design, object‑oriented principles, profiling and performance tuning, multi‑threading, and UI development on both client and server sides.
• Track record of delivering complex, business‑critical systems through the full software development life cycle, ideally in an Agile environment.
• Strong interpersonal and communication skills, with the ability to engage traders, quantitative analysts, developers and senior management.
• Ability to meet deadlines and make sound decisions under pressure in a fast‑paced environment.
• Excellent attention to detail and accuracy.

Advantageous

• WPF experience.

Experience running and deploying .NET Core applications on Linux.

• Experience with real‑time applications, especially Tibco RV.
• Experience in a front‑office trading or financial markets environment.

What You’ll Bring to the Team

• A balance of hands‑on technical credibility and people leadership.
• The ability to build trust with both engineers and business stakeholders.
• A commitment to raising the bar for the team’s skills, tooling and delivery practices.