Software Engineer - Trade Platform

Software Engineer - Trade Platform Job Description Build solutions that power a leading property marketplace We're looking for a Software Engineer to join our Trade Platform Team , where you'll help develop and support the systems that power customer subscriptions, billing, product entitlements, and agency integrations across Domain. Working primarily with C# and .NET , you'll contribute to business-critical platforms that manage customer billing and usage charges, subscription tiers, premium listing experiences, and agency booking services. Your work will directly impact how customers interact with our products and how listings are promoted across the platform. What You'll Do Develop, enhance, and maintain software solutions using C# and .NET. Support systems responsible for customer billing, usage charging, and subscription management. Build functionality that enables premium product features, including listing prioritisation, promotional placements, and customer entitlements. Maintain and improve agency booking APIs and integrations. Design, develop and support scalable applications from concept through to production. Collaborate with Product, Engineering and business stakeholders to deliver customer value. Troubleshoot, diagnose and resolve production issues across critical systems. Contribute to code quality, testing, security and engineering best practices. Participate in a shared on-call roster supporting business-critical applications. Continuously improve platform performance, reliability and scalability. Ideally You'll Have Commercial experience developing applications with C# and .NET. Experience building and consuming RESTful APIs and integrations. Strong understanding of software engineering fundamentals and design principles. Experience working with SQL databases and distributed systems. Knowledge of cloud platforms such as AWS, Azure or GCP. Experience delivering solutions that are scalable, reliable and maintainable. A collaborative mindset and ability to work effectively within Agile teams. Strong problem-solving and troubleshooting skills. A passion for continuous learning and improving engineering practices. Why Join Us? Work on platforms that directly impact customers and revenue. Be part of a collaborative team with experienced engineers who enjoy sharing knowledge. Tackle complex technical challenges at scale. Contribute to products used by thousands of customers every day. Enjoy opportunities to learn, grow and develop your technical expertise. What’s in it for you Working at CoStar Group means you'll enjoy a culture of collaboration and innovation that attracts the best and brightest across a broad range of disciplines. We offer you generous compensation and performance-based incentives. As well as having an outstanding working environment, other perks include extra days of annual leave, leadership development programs, LinkedIn Learning, Perkbox discounts and much more! At CoStar, we recognise the positive value of diversity and promote equality. We aim at all times to recruit the person who is most suited to the job and welcome applications from people of all backgrounds including but not limited to; people of all genders, of all ages, sexual orientations, ethnicities, nationalities, religions and beliefs. About Domain (part of the CoStar Group) Domain is a leading property technology and services marketplace that is home to one of the largest portfolios of property brands in Australia, including the Domain, Allhomes and Commercial Real Estate (CRE) platforms. In 2025, Domain became part of CoStar Group - a global leader in commercial real estate information, analytics, online marketplaces and 3D digital twin technology. We are dedicated to digitising the world’s real estate, empowering all people to discover properties, insights, and connections that improve their businesses and lives. Equity, Diversity & Inclusion Domain is enthusiastically and unapologetically committed to fostering an equitable, inclusive work culture which reflects our customers and communities. We are proactively looking for candidates from all lived experiences, including people with disability, and people of all ages, ethnicities, cultures (including Aboriginal and Torres Strait Islander Peoples), faiths, sexual orientations, and gender identities (including trans and non-binary people). We are committed to providing an equitable recruitment process for people with disability. If you require adjustments during the process we’re here to support. If you wish to receive this job advertisement in an accessible format, or have a confidential chat about workplace adjustments, please contact our Equity, Diversity and Inclusion team at or leave a message on 1300 858 356 and we will get back to you. What’s Next? We’ll give your application the thoughtful attention it deserves and get back to you as soon as possible. If there’s a match, one of our recruitment consultants will reach out—so keep your phone handy! We’re genuinely excited about the chance to work together and make a meaningful impact. CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing