Senior Software Engineer - C#.NET, API & Cloud

Onyx Gaming; City of Port Phillip; On-site; AUD 100,000 - 150,000; Full time

Benefits offered by this job

Competitive salary

Career growth

EAP

Community Day

Coffee machine

Job summary

Onyx Gaming in Australia seeks a Software Engineer to design, build and evolve platforms powering our products and customer experiences. You will work across backend services, APIs, integrations and modern cloud infrastructure, contributing to reliable, scalable solutions in a regulated, real-world environment.

This hands-on role emphasizes ownership, mentorship and best practices in a C#/.NET environment, while collaborating with QA, Product and external testing partners to deliver high-quality

Qualifications

• 5+ years’ experience building and operating production software systems in backend or full-stack roles.
• Strong experience with C#/NET
• Experience with React/NextJS (or similar front-end frameworks)
• Experience designing and delivering production APIs and services
• Solid database skills (SQL Server or PostgreSQL)
• Exposure to cloud environments (AWS or Azure) and CI/CD practices
• Experience with containerisation (Docker; Kubernetes a plus)
• Understanding of secure development practices and authentication/authorisation
• Comfortable working in agile environments and collaborating with cross-functional teams
• Strong problem-solving and communication skills
• Nice to have: Experience in regulated or high-availability environments
• Observability/monitoring tools

Responsibilities

• Designing and building backend services using C#/.NET (ASP.NET Core) and PHP (Laravel)
• Developing modern front-end experiences using React / NextJS
• Creating and evolving REST/gRPC APIs and integrations
• Deploying and managing cloud infrastructure in AWS
• Modelling and optimising data in SQL Server / PostgreSQL
• Implementing automated testing across unit and integration layers
• Supporting CI/CD pipelines, DevOps practices and production releases
• Monitoring, troubleshooting and improving system reliability and performance
• Applying secure coding practices and supporting compliance requirements
• Collaborating with QA, Product and external testing partners to deliver high-quality releases
• Providing technical mentoring and guidance to other developers, particularly across C#/.NET development
• Supporting code reviews, engineering standards and continuous improvement initiatives
• Contributing to documentation, engineering standards and continuous improvement

Skills

C#/.NET

React/NextJS

APIs/Services

SQL Server/PostgreSQL

AWS/Azure

Docker/Kubernetes

Secure development

Agile

Tools

Docker

Kubernetes

ASP.NET Core

Laravel

Job description

Onyx Gaming in Australia seeks a Software Engineer to design, build and evolve platforms powering our products and customer experiences. You will work across backend services, APIs, integrations and modern cloud infrastructure, contributing to reliable, scalable solutions in a regulated, real-world environment.

This hands-on role emphasizes ownership, mentorship and best practices in a C#/.NET environment, while collaborating with QA, Product and external testing partners to deliver high-quality