Senior Software Engineer - Backend/GraphQL at CoStar Group in Sydney (AU)

Job description

• <br>
• 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.

Responsibilities

• ● 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.
• ● 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
• ● 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.

Requirements

• ● 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
• ● Strong experience designing and operating GraphQL APIs (schema design, resolvers,
• performance, caching, observability, versioning/deprecation)
• ● 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
• code quality.
• ● 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
• ● Experience building production AI/LLM systems
• ● AWS (or other Cloud Platform) Certification
• <br>

Skills

Required

• Node.js / TypeScript
• GraphQL
• Apollo GraphQL
• REST/GraphQL APIs
• events/messaging
• query cost analysis
• rate limiting
• depth limiting
• Authentication & authorization patterns
• AWS
• Docker
• ECS

Preferred

• Apollo Federation
• Yoga
• Kubernetes
• C# .NET
• Python
• AI coding assistants
• AI-assisted engineering workflows
• Production AI/LLM systems