Senior Software Engineer - Audience Amplification

CoStar Group; Sydney; On-site; AUD 150,000 - 190,000; Full time

Job summary

Domain Holdings Australia (Domain), part of the CoStar Group, is seeking a Senior Software Engineer for the Audience Amplification Platform in Sydney. You will own the full project lifecycle from design and development to testing, deployment, and ongoing improvements.

The role emphasizes mentoring junior engineers and collaborating with a cross-functional squad and Product Owner to maximize customer value. You will bring deep expertise in C#/.NET, ASP.NET Core, and modern frontend tech, with

Qualifications

• Experience with .NET, React, and TypeScript or similar frontend technologies.

Responsibilities

• Owns the full lifecycle of medium-sized projects from design to deployment and improvements.

Skills

C# / .NET

ASP.NET Core

React

TypeScript

Cloud platforms

Microservices

Event-driven architecture

API design

Kafka/SNS-SQS

SQL data stores

NoSQL databases

DevOps / CI/CD

Education

Degree in Computer Science / Software Engineering or related field

Tools

AWS

Azure

GCP

PostgreSQL

MySQL/Aurora

DynamoDB

Redis

Job description

Senior Software Engineer - Audience Amplification

This is a full-time, permanent role with Domain Holdings Australia (Domain), part of the CoStar Group, based in Sydney. The Senior Engineer is pivotal in supporting the delivery of our Domain Strategy by driving innovation and ensuring the development of high-quality software solutions. They are responsible for the entire lifecycle of medium-sized projects: engineering design, development, test, production, deployment, and subsequent fixes and improvements. By leveraging advanced technical skills and a deep understanding of software engineering principles, the Senior Engineer contributes to the creation of robust, scalable, and efficient applications that align with our strategic goals. This role involves writing and reviewing code, as well as architecting solutions that meet both current and future business needs. 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 the Product Owner to ensure that software solutions are aligned with customer value and business needs.

Squad Mission

The Audience Amplification Platform team sits within the Agent Division and is responsible for Domain Group’s digital marketing innovation, powering the next generation of property advertising beyond our owned platforms. The team builds and supports Domain’s social platform products, enabling high-impact campaigns across Facebook, Instagram, Google and other leading digital channels. Our mission is to make every campaign smarter, more transparent and more effective for our customers.

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.

Technical Skills

• Deep expertise in C# / .NET and ASP.NET Core.
• Understands shift-left testing and how to implement it in practice
• Familiar with Functional and Object Oriented programming
• Familiar with Cloud Design patterns, TDD, BDD and Domain Driven design
• Familiar with modern Application Security Practices (OWASP)
• Degree in Computer Science / Software Engineering or related field

System Thinking

• Understands the big picture and system-wide impact, aligning with and contributing to Domain-wide architecture, security and technology standards.
• Designs solutions with scalability and future needs in mind.
• Optimises for performance, maintainability, and security, and actively looks for security vulnerabilities both in code and when providing code reviews.
• Contributes to the System Health and Tech Debt backlog for their respective owned service.
• Collaborates with Lead Engineers and Tech Leads on improving processes and system change.
• Finds solutions to unsolved, loosely defined, highly technical problems.

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.

Ideally, you will have:

• 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.

What’s in it for you?

The opportunity to work for Domain, now part of CoStar Group, a global leader in commercial real estate information, analytics, online marketplaces and 3D digital twin technology. We are dedicated to digitising the world’s real estate, empowering all people to discover properties, insights, and connections that improve their businesses and lives.

Domain 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 [e-mail] or leave a message on 1300 858 356 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