Senior .NET Engineer: Lead, Architect & Mentor

Domain Group; Sydney; On-site; AUD 140,000 - 180,000; Full time

Job summary

Domain Holdings Australia, part of CoStar Group, is seeking a Senior Engineer based in Sydney to drive Domain Strategy through high-quality software delivery. You will own the full lifecycle of medium-sized projects, from design to deployment, mentor junior engineers, and collaborate with cross-functional squads alongside the Product Owner to ensure customer value and business alignment.

The role demands deep expertise in C#/.NET, ASP.NET Core, and modern frontend tech (React/TypeScript), with

Qualifications

• Degree in Computer Science / Software Engineering or related field.
• Experience with C#/.NET and ASP.NET Core.
• Strong frontend experience with React and TypeScript.

Responsibilities

• Own the full project lifecycle from design to deployment and maintenance.
• Write, review, and co-author clear production-ready code and documentation.
• Mentor junior engineers and contribute to engineering best practices.

Skills

C# / .NET

ASP.NET Core

React

TypeScript

Cloud platforms

Microservices

Kafka

PostgreSQL/MySQL

Education

Degree in Computer Science / Software Engineering

Tools

AWS

Azure

GCP

CI/CD

Job description

Domain Holdings Australia, part of CoStar Group, is seeking a Senior Engineer based in Sydney to drive Domain Strategy through high-quality software delivery. You will own the full lifecycle of medium-sized projects, from design to deployment, mentor junior engineers, and collaborate with cross-functional squads alongside the Product Owner to ensure customer value and business alignment.

The role demands deep expertise in C#/.NET, ASP.NET Core, and modern frontend tech (React/TypeScript), with