Senior Software Engineer - Cloud-Native .NET Platform

Domain; Sydney; On-site; AUD 140,000 - 170,000; Full time

Job summary

Domain Holdings Australia, part of the CoStar Group, is seeking a Senior Engineer in Sydney to drive innovation and deliver high-quality software solutions. You will own the full project lifecycle—from design to deployment—while mentoring junior team members within a cross-functional squad that partners with Product Owners to maximise customer value.

You will work with .NET, React/TypeScript and cloud platforms (AWS, Azure, GCP), embrace security, scalability and observability, and help shape

Qualifications

• Experience with .NET, React, TypeScript or similar frontend technologies.
• Experience with cloud platforms such as AWS, Azure or GCP.
• Experience with microservices and event-driven architectures.
• Experience with API and asynchronous integration patterns such as SNS/SQS and Kafka.
• Experience with SQL data stores (PostgreSQL, MySQL/Aurora) and NoSQL (DynamoDB, Redis).
• Experience with DevOps practices, CI/CD, and infrastructure-as-code.
• Experience designing software solutions for scale.
• Experience mentoring more junior engineers.
• Experience working in cross-functional teams (Product, Design and Tech).
• Experience integrating with third-party platforms, partner APIs or external services.
• Experience with observability and production support.
• Experience with product analytics, reporting or campaign performance data.

Responsibilities

• Responsible for the entire lifecycle of projects: engineering design, development, test, production, deployment, and subsequent fixes and improvements.
• 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.

Skills

C# /.NET

ASP.NET Core

Frontend: React & TypeScript

Cloud platforms (AWS, Azure, GCP)

Microservices & event-driven

API & async integration (SNS/SQS,Kafka

SQL Databases (PostgreSQL, MySQL/Auror

NoSQL (DynamoDB, Redis)

DevOps / CI/CD / IaC

Design for scale / performance / sec

Observability & production support

Product analytics / reporting data

Education

Degree in Computer Science / Software Engineering or related field

Tools

React

TypeScript

AWS

Azure

GCP

Docker

Kubernetes

Terraform

CI/CD tooling

Job description

Domain Holdings Australia, part of the CoStar Group, is seeking a Senior Engineer in Sydney to drive innovation and deliver high-quality software solutions. You will own the full project lifecycle—from design to deployment—while mentoring junior team members within a cross-functional squad that partners with Product Owners to maximise customer value.

You will work with .NET, React/TypeScript and cloud platforms (AWS, Azure, GCP), embrace security, scalability and observability, and help shape