Senior .NET Developer

About AionixSoft

AionixSoft is a software outsourcing company. We provide experienced developers who work as part of our clients' own engineering teams, across web, desktop, AI and legacy modernization projects.

About the role

You'll design and build backend services in C# and .NET 8, work directly with client stakeholders, help shape technical decisions and keep production code in good shape. Fully remote.

Responsibilities

• Design, build and maintain backend services and REST APIs with C#, .NET 8 and ASP.NET Core

• Model data and write efficient queries in SQL Server or PostgreSQL, using Entity Framework Core or Dapper

• Deploy and run services on Azure or AWS, with Docker and CI pipelines

• Review code, write tests and keep a high bar on quality and security

• Turn business needs into clear technical solutions together with clients

• Find and fix performance bottlenecks and production issues

• Mentor less experienced developers

Requirements

• 5+ years of commercial development, mostly in C# and .NET

• Strong experience with ASP.NET Core and REST APIs

• Solid SQL skills, plus Entity Framework Core or Dapper

• Hands-on experience with Azure or AWS

• Good grasp of SOLID, design patterns, clean architecture and microservices

• Automated testing with xUnit or NUnit

• Git, CI and CD pipelines, and Docker

• English at B2 level or higher

Nice to have

• AI features or LLM APIs in production apps

• React or Angular

• Kubernetes, Terraform or Bicep

• Experience modernizing legacy .NET Framework applications

What we offer

• Fully remote work

• Long-term client projects across web, AI, desktop and mobile

• A small team where your technical calls matter

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