The Residential Energy Rating team is looking for software developers and specialists to join our growing team.
The Opportunity
We are looking to fill a Full Stack .NET Developer role contributing to the development and enhancement of the FirstRate5 (FR5) web portal and related cloud applications. FR5 is one of Australia's accredited tools under the Nationwide House Energy Rating Scheme (NatHERS), used by Thermal Performance Assessors (TPAs) to simulate and compare residential heating and cooling energy demands, producing certificates for National Construction Code (NCC) compliance.
The FR5 Web Portal is built on .NET Framework 4.8 using ASP.NET MVC / Web API and integrates with Sitefinity CMS. Over time, we are modernising and refactoring the solution to reduce dependencies on Sitefinity, moving toward a clean, domain-driven architecture where the application can run independently if required.
The role involves delivering new features while also contributing to ongoing refactoring and architectural separation efforts. You'll work with MVC (Model-View-Controller) controllers, APIs, and Vue.js components to deliver modern, maintainable solutions.
You'll also contribute to .NET 8 Azure Functions apps in the FR5 ecosystem. While the role is primarily focused on the FR5 .NET web applications, it will also provide primary development support for the Whole of Home (WoH) Node.js application when required, focusing on stabilisation, defect resolution, and incremental improvements while supporting the transition away from the application.
This position is ideal for a motivated developer with a strong grounding in C#, MVC, and web development best practices who is eager to grow their skills in Clean Architecture, Domain-Driven Design (DDD), and frontend development while contributing to a nationally significant software product that impacts energy efficiency across Australia.
This role is delivery-focused across modern web technologies, contributing to platform evolution within established architecture and under senior technical direction.
Duties
1. Software Development & Architecture
Develop and maintain the FR5 Web Portal using ASP.NET MVC (Sitefinity CMS), C#, and related technologies.
Implement modern, reusable Vue.js components to deliver complex, interactive UIs.
Contribute to RESTful Web APIs consumed by internal and external applications.
Support development of small .NET 8 Azure Function Apps used in the FR5 ecosystem.
Provide primary development support for the Whole of Home (WoH) Node.js application when required, focusing on stabilisation, defect resolution, and incremental improvements.
Support transition activities to reduce reliance on WoH over time (e.g., incremental migration, decommissioning planning, or replacement solutions), in line with agreed priorities.
Write clean, testable, and maintainable code aligned with DDD and Clean Architecture principles.
Participate in code reviews and collaborate on design decisions.
2. Collaboration & Growth
Work collaboratively with senior developers and the Technical Lead, contributing to team delivery goals and taking ownership of assigned features and refactoring tasks.
Collaborate with cross-functional teams including user experience (UX), product, quality assurance (QA), and business stakeholders.
Demonstrate willingness to learn and expand skill sets, particularly in Sitefinity, Vue.js, and Azure Functions.
Share knowledge with peers and contribute to a culture of continuous improvement.
3. Quality & Process Improvement
Apply best practices in version control (Git), continuous integration/continuous delivery (CI/CD), and testing.
Contribute to maintaining high standards of code quality, documentation, and architectural consistency.
Participate in Agile ceremonies and iterative development cycles.
Support improvements in development workflows and tooling.
Skills and relevant experience
1. Technical Expertise
Demonstrated commercial experience delivering and maintaining C#/.NET web applications in production environments.
Experience with ASP.NET MVC (experience with Sitefinity CMS highly regarded).
Familiarity with JavaScript frameworks (Vue.js preferred; React or Angular also considered).
Understanding of Web APIs, REST, and integration patterns.
Exposure to Azure DevOps, Azure Functions, and Azure cloud services.
Experience maintaining a Node.js application in production, or demonstrated ability to quickly learn and support an existing Node.js codebase.
2. Software Engineering Best Practices
Strong grasp of object-oriented programming and design patterns.
Demonstrated experience refactoring legacy applications to improve maintainability, reduce coupling, and align with modern architectural principles.
Commitment to clean code, testability, and maintainable architecture.
Familiarity with DDD and Clean Architecture principles desirable.
3. Collaboration & Communication
Ability to work effectively in a collaborative Agile team environment.
Good written and verbal communication skills, able to translate requirements into working solutions.
4. DevOps & Tooling
Proficiency with Git and experience in CI/CD pipelines (Azure DevOps or GitHub Actions).
Experience with Agile development processes.
What we offer you
We're building a team designed to inspire and engage. As we redefine our product, you'll have the opportunity to help shape our culture and influence how we grow.
This is a fixed term position available for a period of 12 months. The work location for this position is 8 Nicholson Street, East Melbourne with hybrid work arrangements available.
To be considered for this position, applicants are encouraged to submit a resume and cover letter (no longer than 2 pages) summarising their skills and relevant experience.
Please refer to the Key Selection Criteria provided in the Position Description , including the mandatory requirements.
How to Apply:
If you are a current DEECA employee, please apply via DEECA Careers.
Applications close 11.59pm on Sunday, 16 August 2026.
All applications must be submitted through the online portal. We are unable to consider email or manual applications at this time.
Other relevant information:
Preferred candidates will be required to undertake pre-employment screening, including a Declaration and Consent form and a Nationally Coordinated Criminal History Check.
To be eligible for appointment to this role, applicants will possess corresponding work rights for the advertised employment period. Appointment to an ongoing position is only available to an Australian/New Zealand citizen or an Australian Permanent Resident.
An inclusive, culturally safe and flexible workplace
DEECA fosters an inclusive workplace culture and is committed to a fair, accessible, and equitable recruitment process.
We strongly encourage Aboriginal and or Torres Strait Islander people to apply. We recognise the strengths, knowledge and perspectives First Nations people bring and DEECA is committed to a culturally safe and respectful workplace. If you need support to participate, please contact
[email protected] .
We support flexible working arrangements, including hybrid work, varied hours, part-time work and job sharing. For more information about our recruitment processes, visit applying for a role with us .
