Senior Software Engineer

Job Description: Responsibilities: Technical Excellence & Innovation Build high-quality, scalable, reliable, and performant solutions with engineers and tech leads.Champion engineering best practices and contribute to system health and technical debt improvements.Drive engineering efficiency and collaborate with tech leads to improve processes and systems. Leadership & Collaboration Mentor junior engineers in solution design and development.Develop a strong understanding of the product and business domain.Work with Product Managers to ensure solutions meet customer and business needs. Operations Participate in on-call rotations and respond to incidents.Continuously improve processes and software quality to reduce incidents. Qualifications: Required Technical Skills: Deep expertise in at least one of: Node.js (TypeScript), React (TypeScript), or Python — and comfortable across all threeWorking knowledge of .NET (C# preferred) — you don't need to be an expert, but you can read, review, and contribute to .NET codebases when neededStrong understanding of REST API design, security best practices, and authentication patterns (JWT, OAuth2, JWKS)Extensive experience with relational databases (PostgreSQL) — including schema design, query optimization, and migrationsProven ability to apply Clean Architecture or similar structured design patterns in a production codebaseStrong experience with AWS (EC2, SQS, S3, CloudFront) and cloud-native patternsExperience designing and working with asynchronous/event-driven systems (message queues, background workers)Track record of delivering high-quality features in an Agile environment using Git, CI/CD, Jira, and Confluence Nice-to-have: Experience with Auth0 or enterprise identity providers (SSO, M2M, multi-tenant auth)Experience with observability tooling — New Relic, Mixpanel, CloudWatchA security-first mindset — input validation, token verification, least privilege, avoiding common OWASP vulnerabilitiesExperience leading or significantly contributing to a platform migration or re-architectureFamiliarity with containerisation (Docker) and Kubernetes or Helm deployments Experience Experience designing software solutions for scaleWorking with Tech Leads to optimize engineering practices.Experience working with one of the common Cloud Platforms such as AWS, Azure, and/or GCPExperience implementing DevOps practices and CI/CDMentoring junior engineers and collaborating with cross-functional teams.Microservices architecture and relational/non-relational databases. Why join us? We’re the right size business for you to make a real impact, with a workplace culture where you can be you. Perks of the role include: Discover your ideal work-life balance with our approach to a hybrid set-up – whether it's making the most of working remotely or from our officeAccess to LinkedIn Learning, giving you learning opportunities to upskill and work on your personal growthGovernment-mandated benefitsHMO + 1 free dependent upon regularizationLeave creditsQuarterly bonus incentives Company Overview CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index and the NASDAQ 100, CoStar Group is on a mission to digitize the world's real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We've continually refined, transformed, and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. About Domain: 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 (NASDAQ: CSGP), a global leader in commercial real estate information, analytics, online marketplaces and 3D digital twin technology. Together, Domain and CoStar Group is dedicated to digitising the world's real estate, empowering all people to discover properties, insights, and connections that improve their businesses and lives. 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. 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 edi@domain.com.au or leave a message on 1300 858 356 and we will get back to you. CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing.