The Senior Engineer drives high-quality software development and innovation, serving as a key driver of
technical direction within Domain's Residential Consumer web teams. This pivotal role involves
architecting scalable, highly performant user interfaces and supporting back-end systems, writing and
reviewing code, and ensuring all technical solutions align with the broader Domain Strategy. Leveraging
deep expertise across front and backend technology stacks the engineer will lead the development of
complex features and champion frontend quality standards to solve real customer problems and enhance
our website.
The Senior Engineer plays a crucial role in mentoring and guiding more junior team members, fostering a
culture of continuous improvement and engineering excellence. By leading by example and providing
support, this role helps build a strong, cohesive squad team capable of tackling complex challenges and
delivering high-quality software products. The Senior Engineer also collaborates closely within their cross-
functional squad team, working closely with leaders and business analysts to ensure that software
solutions are aligned with customer value and business needs.
Problem-Solving and Technical Expertise
Responsible for the entire lifecycle of medium-sized projects: engineering design, development, test, production, and deployment and subsequent fixes and improvements.
Finds solutions to unsolved, loosely defined, highly technical problems.
Consistently writes, co-writes, and reviews documentation and production-ready code that is clear, concise, tested, and easily understood by others.
Proficient in multiple languages, frameworks, and tools.
Quick and effective in identifying and resolving issues,



balancing trade-offs between speed, quality, and technical debt.
Approaches work with a security lens and actively looks for security vulnerabilities both in code and when providing code reviews.
System Thinking
Understands the big picture and system-wide impact, aligning with and contributes to domain-wide architecture, security and technology standards.
Designs solutions with scalability and future needs in mind.
Optimises for performance, maintainability, and security, actively looks for security vulnerabilities both in code and when providing code reviews.
Contribute to the System Health and Tech debt backlog for their respective owned service.
Collaborate with Lead Engin
Mentorship and Leadership
Mentors and guides junior team members, fostering a culture of continuous improvement and engineering excellence.
Encourages collaboration and team alignment, ensuring the squad develops high-quality solutions.
Builds a deep understanding of their product and business domain.
Collaborates with Product Owners to ensure that solutions are aligned with business and customer needs.
Required Experience
Degree in Computer Science / Software Engineering or related field
Deep expertise in at least one programming language and stack, with strong preference for Node.js / TypeScript in backend systems




Solid experience designing and operating GraphQL APIs (schema design, resolvers,
Experience with Apollo GraphQL (Apollo Server and related tooling); Apollo Federation is a nice-to-have
Strong understanding of synchronous and asynchronous integration patterns (REST/GraphQL APIs, events/messaging)
Experience operating a GraphQL platform used by multiple teams/consumers, with a focus on reliability, performance, and developer experience
Familiar with GraphQL frameworks such as Yoga, Apollo (Preferred)
Experience with query cost analysis, rate limiting, depth limiting in GraphQL
Authentication & authorization patterns in GraphQL
Experience with AWS + Docker + ECS, with an understanding of platform evolution toward Kubernetes (nice-to-have)
Hands-on experience leveraging AI coding assistants to improve engineering productivity and
Experience designing software solutions built for high scale and high traffic websites.
DevOps practices, CI/CD, and infrastructure-as-code
Strong practical experience with cloud services technologies such as containerised deployment, DynamoDB, ElasticSearch/OpenSearch
Familiarity with containerization technologies like Docker. Experience working effectively within Agile environments.
[NICE TO HAVE] Experience with C# .NET
[NICE TO HAVE] Python to support our legacy services
[NICE TO HAVE] Apollo Federation and/or other schema composition approaches
Hands on experience with AWS
Experience with AI-assisted engineering workflows
AWS (or other Cloud Platform) Certification
CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing
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📌 Senior Software Engineer - Backend/Graphql (New South Wales)
🏢 Costar Group
📍 New South Wales