Senior Engineer

Senior Engineer - Identity Platform Job Description 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 marketplace reaching 7 million Australians each month, making it one of the country’s most recognised and trusted property platforms. Domain operates the Allhomes and CRE ‘commercial real estate’ platforms and provides product and solutions to consumers, agents, government and enterprise to digitise every step of the property journey. Learn more about Domain: About the Role The Senior Engineer role within our Identity Platforms plays a crucial role in supporting and driving our company's strategy by: Enables secure innovation by building and maintaining robust Authentication and Authorisation systems. Enhances operational security through the implementation of best practices in identity and access management (IAM). Ensures scalability and reliability of identity systems, supporting our commitment to customer trust and business continuity. Drives digital transformation by championing the adoption of modern identity solutions and secure-by-design principles. Improves time-to-market by developing efficient and reusable identity solutions. Enhances security and compliance in our identity infrastructure. Technical Skills Deep expertise in identity platforms (e.g., Okta, Auth0, WorkOS) and developing custom authentication systems Advanced knowledge of OAuth2, OpenID Connect, SAML, RBAC, ABAC, and REBAC for secure access management Proficiency in languages like C#, TypeScript, or Python with experience in implementing secure coding practices Mastery of Infrastructure as Code (IaC) tools (e.g., Terraform, AWS CDK) for deploying identity solutions Expertise in deploying identity services on containerised platforms like Kubernetes, ensuring scalability and reliability Advanced knowledge of CI/CD tools and practices, with a focus on integrating security checks and shift-left testing principles Extensive experience with RESTful APIs, GraphQL, and secure API management for Authentication and Authorisation services Strong understanding of identity system architectures, including microservices, serverless computing, and event-driven designs Comprehensive knowledge of cloud security, OWASP guidelines, DevSecOps, and advanced cryptographic practices Proficiency with monitoring tools like Elastic and OpenTelemetry for identity system health monitoring and proactive threat detection Experience with major cloud platforms (AWS, Azure, GCP), focusing on implementing cloud-native identity and access management solutions Experience in creating and managing developer portals, API gateways, and identity self-service platforms for streamlined integration Soft Skills Excellent problem-solving and analytical skills Strong communication skills, with the ability to explain complex security and identity concepts to both technical and non-technical stakeholders Proven ability to work effectively in cross-functional teams Self-motivated with a passion for continuous learning and staying updated with the latest identity, security, and cloud trends Qualifications Bachelor's degree or higher in Computer Science, Software Engineering, Cybersecurity, or a related field, or equivalent professional experience Advanced cloud certifications (e.g., AWS Certified Security - Specialty, Google Professional Cloud Security Engineer) 5+ years of experience in identity engineering, security engineering, or related roles, with a strong focus on authentication and authorisation systems 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. Apply now to help us drive progress in diversity, equity, and inclusion. We are devoted to fostering a diverse and supportive work environment and warmly welcome applications from Aboriginal and Torres Strait Islander peoples. If you have any accessibility needs or require accommodations during the application process, please let us know, and we will ensure you receive the support you need. Equity, Diversity & Inclusion Domain Group 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 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. #J-18808-Ljbffr