Senior Software Engineer, CRE Platform — Build Scalable Tech

costar; New South Wales; On-site; AUD 140,000 - 180,000; Full time

Job summary

Domain is seeking a Senior Software Engineer to join a tight-knit team building the CRE platform. You will design, build, and evolve scalable, production-grade software powering a commercial property marketplace in Australia.

You’ll collaborate with product, design and engineering peers to deliver reliable, high-performance solutions and influence technical direction and best practices. You will mentor peers, champion code quality and testing, and drive improvements in performance and developer

Qualifications

• Strong experience shipping production-grade software and making critical architectural trade-offs.
• Expertise in .NET/C# development.
• Experience building and supporting cloud-native applications within AWS.
• Strong understanding of modern front-end technologies including React, Next.js, TypeScript, and JavaScript.
• Experience with relational databases and distributed systems.
• Knowledge of CI/CD, Test Driven Development (TDD), and software engineering best practices.
• Strong problem-solving skills and an ownership mindset.
• Ability to collaborate effectively with both technical and non-technical stakeholders.

Responsibilities

• Work collaboratively within a cross-functional team to deliver high-quality software solutions.
• Design, develop, and maintain scalable applications and services.
• Build clean, maintainable, and rigorously tested code.
• Deliver impactful features and essential fixes directly to production.
• Contribute to system architecture, technical design, and engineering best practices.
• Mentor engineers and champion high standards for code quality, testing, and delivery.
• Identify opportunities to improve performance, reliability, and developer experience.
• Help drive continuous improvement across the team and platform.

Skills

Production-grade software

Architectural trade-offs

Ownership mindset

Collaboration

Mentoring

Code quality & testing

Tools

.NET/C#

AWS (Lambda, ECS, EKS, DynamoDB)

OpenSearch

Databases (PostgreSQL/MySQL/SQL Server)

TypeScript/JavaScript

React/Next.js

CI/CD

Test Driven Development

Job description

Domain is seeking a Senior Software Engineer to join a tight-knit team building the CRE platform. You will design, build, and evolve scalable, production-grade software powering a commercial property marketplace in Australia.

You’ll collaborate with product, design and engineering peers to deliver reliable, high-performance solutions and influence technical direction and best practices. You will mentor peers, champion code quality and testing, and drive improvements in performance and developer