If you believe everyone should be able to achieve their financial potential, you’ll enjoy contributing to CMC Markets’ vision of delivering the ultimate trading experience while progressing your career in the fintech industry with a global leader in CFD trading and share investing.

As a Senior Software Engineer, you will play a key role in diagnosing and optimising performance across .NET and modern .NET applications that support business-critical systems, working hands-on with complex, high-throughput platforms to analyse code, databases, and infrastructure to improve scalability, reliability, and efficiency. Collaborating closely with Engineering and DevOps teams, you’ll gain end-to-end exposure to high-performance production environments, contribute to architectural reviews and modernisation initiatives, and mentor engineers to elevate performance standards—growing personally and professionally with a company expanding globally and continuously evolving its product offering.

Why You'll like working here

Just some of the reasons you’ll love working here include:

• Leave benefits: Enjoy your birthday off to spend time with family and friends, on us! Utilise a free annual charity day to give back to your community.

• $0 Trades: Staff & family trading accounts with CMC Markets Invest have access to the best brokerage rates in the market - $0 trades for all domestic and international equity orders!

• Continuous learning: Our L&D offering covers both technical and performance training, ensuring you're always learning new skills.

• Unlimited access to a dedicated benefits & wellbeing hub where you can save money through various retailer discounts, and make use of a variety of resources that will enhance your physical and mental wellbeing.

• Collaboration: We believe that great things happen when smart people work together, that’s why we’ve made the decision to work five days in the office.

• Office perks: Help yourself to free breakfast cereals, condiments, and coffee to fuel your workday. Our culture club provides opportunities for everyone whether you’re into fitness, pizza making classes, socialising or bringing out your competitive side in trivia or lawn bowls!

What you’ll be working on

Performance & Optimization

• Help improve the performance of .NET applications by identifying and fixing issues across application, database, and infrastructure layers.
• Work with web, service, and background systems to improve speed, reliability, and efficient use of resources.
• Suggest and implement practical improvements such as better asynchronous patterns, caching, and smarter design choices.

Design & Modernization

• Contribute to design discussions to ensure systems are scalable, maintainable, and performant.
• Be involved in modernising legacy .NET systems and exploring newer technologies.

What will help you be successful?

• 5+ years’ experience with .NET Framework (4.x), C#, and performance diagnostics in production systems.
• Strong understanding of .NET Framework and .NET Core runtime behaviour, including performance tuning and concurrency.
• Experience using profiling and debugging tools such as PerfView, dotTrace, Visual Studio Profiler, and ETW.
• Hands-on experience optimising Entity Framework and database queries.
• Familiarity with CI/CD pipelines, performance baselining, and load testing tools (e.g. JMeter, k6).

The things we live by

CMC Markets is powered by our people. We are an equal opportunities employer and are committed to creating a diverse and inclusive workplace, where our people feel confident to be themselves, feel valued and are able to do their best work. We don’t just value differences and unique perspectives, we seek them out and we invite them in, because we know it will lead to better outcomes for everyone

Click on the link to find out more about the things we live by at CMC Markets CMC Markets - Culture Video  

We’re always on the lookout for great people, so even if you don’t feel you are a 100% fit, apply with your up-to-date CV and we’ll consider you for this role and any other suitable opportunities across the business. 

 We look forward to hearing from you! 

Please be vigilant when applying for jobs online. CMC Markets will never request personal identification details, such as Date of Birth or Tax File Number prior to an offer being made. If your initial application is successful, regardless of whether you've applied directly or through an approved recruiter, you will always liaise with a representative from CMC's Talent Acquisition team. We will only discuss a role you have formally applied for via phone or email (CMC Markets email address); and never via Facebook or Telegram.