Senior Dotnet Developer

Renaissance Infosystems Pte Ltd; Sydney; On-site; AUD 90,000 - 120,000; Full time

Job summary

Renaissance Infosystems Pte Ltd in Sydney is seeking a skilled .NET Engineer to contribute to design, development, enhancement and support of modern applications and APIs.

The candidate should have strong hands-on experience with C#, .NET, and ASP.NET Core, plus RESTful APIs, secure development and modern engineering practices.

You will collaborate across teams to deliver reliable software, adhere to SDLC, and continuously improve engineering practices.

Qualifications

• Hands-on experience with .NET and C# in professional settings.

Responsibilities

• Design, develop and maintain applications using .NET, C#, ASP.NET Core and modern web technologies.

Tools

Entity Framework Core

Dapper

JWT

OAuth

Dependency Injection

Design patterns

Job description

We are looking for a skilled .NET Engineer to join our team and contribute to the design, development, enhancement and support of modern applications and APIs.

The ideal candidate will have strong hands‑on experience with C#, .NET and ASP.NET Core, along with a solid understanding of RESTful APIs, secure application development and modern software engineering practices.

Key Responsibilities

• Design, develop and maintain applications using .NET, C#, ASP.NET Core and modern web technologies.
• Develop and integrate RESTful Web APIs, including authentication and authorization using JWT/OAuth and appropriate CORS configuration.
• Write clean, maintainable and secure code following OOP, SOLID principles and established design patterns.
• Work with Entity Framework Core or Dapper for data access and database integration.
• Apply Dependency Injection and modern .NET development practices.
• Follow secure coding standards and demonstrate awareness of the OWASP Top 10.
• Participate across the Software Development Life Cycle (SDLC), including development, testing, deployment and maintenance.
• Provide application support, troubleshooting and production issue resolution.
• Collaborate with developers, technical teams and stakeholders to deliver quality solutions.
• Contribute to knowledge sharing, continuous improvement and adoption of better engineering practices.

Key Skills & Experience

• Strong commercial experience with .NET and C#.
• Hands‑on experience with ASP.NET Core Web APIs and RESTful services.
• Experience with JWT or OAuth authentication and CORS.
• Strong understanding of OOP/OOPS concepts and Entity Relationship Management.
• Hands‑on experience with Entity Framework Core or Dapper.
• Good understanding of Dependency Injection and SOLID principles.
• Working knowledge of design patterns and secure coding practices.
• Understanding of OWASP Top 10.
• Experience across the SDLC and application support/development.
• Strong communication, collaboration and problem‑solving skills.
• A proactive attitude towards learning, knowledge sharing and continuous improvement.