Senior Software Engineer - Audience Amplification Platform

CoStar Group, Inc.; Sydney; On-site; AUD 140,000 - 180,000; Full time

Job summary

CoStar Group, Inc. is seeking a Senior Software Engineer for the Audience Amplification platform. You will own end-to-end delivery, mentor juniors, and shape scalable software aligned with product value and customer outcomes.

You will work across .NET, React, TypeScript, and cloud-native architectures, contributing to secure, robust systems with a focus on quality and continuous improvement within a cross-functional squad.

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.
• Degree in Computer Science / Software Engineering or related field.

Responsibilities

• Responsible for the entire lifecycle of projects: engineering design, development, test, production, and deployment and subsequent fixes and improvements.
• 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.
• Identify and resolve issues, balancing speed, quality, and technical debt.
• Approaches work with a security lens and reviews code for vulnerabilities.

Skills

C# / .NET

ASP.NET Core

React

TypeScript

Cloud platforms

AWS

Azure

GCP

Microservices

Event-driven architectures

APIs & asynchronous patterns

SQL & NoSQL databases

DevOps / CI/CD

Infrastructure as code

Security practices (OWASP)

Testing - shift-left

OO & Functional programming

Domain-Driven Design

Education

Degree in Computer Science / Software Engineering

Tools

PostgreSQL

MySQL/Aurora

DynamoDB

Redis

Kafka

SNS/SQS

Job description

CoStar Group, Inc. is seeking a Senior Software Engineer for the Audience Amplification platform. You will own end-to-end delivery, mentor juniors, and shape scalable software aligned with product value and customer outcomes.

You will work across .NET, React, TypeScript, and cloud-native architectures, contributing to secure, robust systems with a focus on quality and continuous improvement within a cross-functional squad.