C# Trading Systems Developer - GDS

Scaleup; Sydney; On-site; AUD 120,000 - 190,000; Full time

Job summary

Scaleup in Sydney seeks high-performance software engineers for the Equites desk within a dedicated trading environment. You will work directly with traders, gather requirements, and architect real-time systems across regional markets and futures.

Expect to move from monolithic code toward a modern, distributed architecture using C# microservices on Linux, with 80% backend and 20% UI. Strong CS fundamentals and passion for trading are essential.

Qualifications

• Strong experience in building high-performance systems, preferably in finance or trading.
• Deep understanding of memory management, data structures, and concurrency.
• Experience delivering low-latency, concurrent software in complex environments.

Responsibilities

• Architect and deploy real-time systems that run across regional markets and futures.
• Collaborate directly with traders, gathering requirements and owning the lifecycle from ideation to production.
• Build a modern C# microservices platform on Linux with high-performance thin-client UI.

Skills

C#

C++

Java

Multithreading

Education

Computer Science degree

Job description

Are you tired of building systems that get lost in corporate bureaucracy? In this opportunity, you won’t get lost in fact it will be your engineering directly drives the P&L.

We are looking for high-performance Software Engineers to join the Equites desk of a Sydney based HFTC.

This is not a standard corporate development role. There are no Business Analysts or Project Managers here.

You will sit directly with the traders, gather your own requirements, architect the solutions, and deploy systems that execute in real-time across regional markets and futures.

Whether you are a battle-tested trading systems veteran or an elite Computer Science fundamentalist looking to break into high-frequency finance, if you understand how to build highly concurrent systems from the ground up, we want to talk to you.

You will be stepping into a true systems engineering environment, moving away from monolithic legacy code to build out a modern, highly distributed trading architecture.

• The Stack:Building a completely new C# microservices platform running on Linux, alongside high-performance thin-client WPF applications.
• The Split:80% complex, highly concurrent backend engineering, 20% UI.
• The Environment:Fast-paced Delta One / Prop Trading. You will own the full lifecycle, from trader ideation to deployment and 2nd/3rd line support.

What We Are Looking For

We are hunting for engineers who understand what happensunder the hood, not just how to string frameworks together.

• Core Systems Engineering:Deep, commercial expertise in building applications withC#, or C++. Minimum 2 – 3 years + experience ideally in financial services (with a passion to work in trading is a must)
• If you are an elite low-latency Java developer, we provide a 1-2 month cross-training bridge to master our C# stack.
• Comp Sci Fundamentals:Absolute mastery of memory management, data structures, multithreading, and concurrency.
• Autonomy & Communication:The ability to push back, ask the right questions, and thrive in an environment where you interact directly with aggressive, fast-moving traders.
• The Foundation:A pure Computer Science degree (or equivalent deeply technical foundation).
• Finance knowledge is highly regarded butnotstrictly required for Junior/Mid-level applicants (we can teach you the markets, but we cannot teach you how to write highly concurrent code.)

Please note: This is a software engineering role that borders on low-level systems engineering. It is not suitable for purely web-focused Full-Stack developers (React/Angular/Web Forms) or Python/Data Analysts.

Why this role?

• Zero Red Tape:Flat hierarchy. No massive requirement documents. See your code impact the traders in days, not months.
• Continuous Evolution:Work alongside some of the sharpest quantitative and engineering minds in the Sydney market.
• Elite Compensation:Top-tier base salaries coupled with an aggressive, performance-driven bonus structure aligned with a premier proprietary trading firm.
• The role is on-site 100% of the time, working alongside traders in one of the best offices in Sydney
• Incredible employee retention rate
• Food is taken care of with fully catered meals provided daily
• End of trip facilities