Senior Backend Engineer (GraphQL/Node.js) - Lead

CoStar Group, Inc.; Sydney; On-site; AUD 130,000 - 170,000; Full time

Job summary

CoStar Group, Inc. is seeking a Senior Engineer to drive high-quality software development across our Residential Consumer web teams.

You will architect scalable user interfaces and supporting back-end systems, lead complex feature development, and mentor junior engineers to uphold engineering excellence. In this role, you will work with Node.js/TypeScript, GraphQL, Apollo, AWS, Docker, and CI/CD practices to deliver high-traffic web solutions.

Qualifications

• 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).
• 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

Responsibilities

• Own the entire lifecycle of medium-to-large features: design, development, testing, production, and enhancements.
• Architect scalable, high-performance frontend and backend components.
• Lead code reviews and maintain high standards of code quality and security.
• Mentor junior engineers and foster a culture of continuous improvement.
• Collaborate with product owners and cross-functional teams to deliver customer-focused solutions.
• Ensure reliability, performance, and security across GraphQL services and integrations.

Skills

Node.js

TypeScript

GraphQL

Apollo GraphQL

REST

AWS

Docker

ECS

Kubernetes (nice-to-have)

CI/CD

DynamoDB

ElasticSearch/OpenSearch

DevOps

Python (nice-to-have)

C# .NET (nice-to-have)

AI-assisted coding

Tools

AWS tooling

GraphQL tooling

Apollo Server

Docker

Job description

CoStar Group, Inc. is seeking a Senior Engineer to drive high-quality software development across our Residential Consumer web teams.

You will architect scalable user interfaces and supporting back-end systems, lead complex feature development, and mentor junior engineers to uphold engineering excellence. In this role, you will work with Node.js/TypeScript, GraphQL, Apollo, AWS, Docker, and CI/CD practices to deliver high-traffic web solutions.