Overview

Senior Software Engineer to join the Keystone Squad within our Agent Workflows crew. You'll work across a React TypeScript frontend and Ruby on Rails backend, delivering features and infrastructure used daily by thousands of agents across Australia and New Zealand. Strong TypeScript and React experience is essential. Solid backend engineering and the ability to ramp up quickly on Rails are equally important. You are expected to own design, build tests, monitor production after shipping, and help engineers around you improve as a force multiplier.

What you’ll do

- Rails internals: Deep understanding of ActiveRecord, background job processing (Sidekiq), RESTful API design, and modular architectural patterns including service objects and Rails engines. Strong candidates with experience in comparable frameworks (Python/Django, Elixir/Phoenix) who can ramp up on Rails quickly are welcome.
- Database expertise: Query optimisation, complex joins and views, indexing strategies, query plan analysis, schema and data migrations; working knowledge of constraints, triggers, and stored procedures.
- Security: Rails and web security best practices including OWASP Top 10, data protection, user authentication and authorisation patterns.
- Testing: Comprehensive test coverage across unit, integration, and end-to-end layers using RSpec and Cypress; writes tests that build confidence, not just coverage.
- Observability: Structured logging, error handling, and APM tooling (New Relic or equivalent); knows how to read what is happening in production.
- Frontend (primary): Deep, production-proven experience with React including hooks, Context API, and state management patterns; TypeScript for type-safe development; performance optimisations including memoization, lazy loading, and code splitting.
- Infrastructure: Comfortable with AWS services, CI/CD pipelines with automated testing and deployment,



Terraform basics, and secrets management best practices.

Essential

- 5+ years in software engineering with meaningful senior-level experience in production systems.
- Strong TypeScript and React: you can own frontend features end-to-end with confidence, from component design to production monitoring.
- Solid backend engineering in Ruby on Rails, or a comparable framework (Python/Django, Elixir/Phoenix) with a willingness to ramp up on Rails quickly.
- Deep PostgreSQL experience: query optimisation, indexing, migrations, and performance analysis.
- Demonstrated ability to design solutions upfront, with examples of design docs, ADRs, or architectural decisions you've led.
- A track record of improving team quality through code reviews, mentoring, documentation, or process improvement.
- Comprehensive testing practice across unit, integration, and end-to-end layers (Jest, RSpec, Cypress or equivalent).
- Comfortable with production observability tooling (New Relic, CloudWatch, or equivalent).
- Robust written communication: clear PRs, tickets, and technical documentation.

Nice to have

- Prior Ruby on Rails experience in production.
- Experience with Sidekiq, Redis, and background job architecture.
- Familiarity with AWS services (RDS, SQS, S3, ECS) and Terraform.
- Experience with feature flagging systems (Flipper) and progressive rollout strategies.
- Real estate, proptech, or high-volume B2B SaaS domain experience.




- Experience with API integrations across diverse payload formats (XML feeds, CRM integrations, vendor APIs).

What’s In It For You?

Working at CoStar Group means you'll enjoy a culture of collaboration and innovation that attracts the best and brightest across a broad range of disciplines. We offer generous compensation and performance-based incentives, plus an outstanding working environment and perks such as extra days of annual leave, leadership development programs, LinkedIn Learning, Perkbox discounts, and more.

We recognise the positive value of diversity and promote equality. We aim to recruit the person most suited to the job and welcome applications from people of all backgrounds including but not limited to all genders, ages, sexual orientations, ethnicities, nationalities, religions and beliefs.

About Domain (part of the CoStar Group)

Domain is a leading property technology and services marketplace home to one of the largest portfolios of property brands in Australia. In 2025, Domain became 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.

Equity, Diversity & Inclusion

Domain is committed to fostering an equitable, inclusive work culture reflecting our customers and communities. We welcome candidates from all backgrounds and associations. If you require adjustments during the process or want this advertisement in an accessible format, contact our Equity, Diversity and Inclusion team at or leave a message on .

CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing.

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📌 Senior Engineer (City of Yarra)
🏢 CoStar Group
📍 City of Yarra