Remote Senior Full-Stack Engineer — .NET/.NET Core & Azure

Ifit Solutions; United States; Remote; USD 96,000 - 165,000; Part time

Job summary

Ifit Solutions is seeking a senior software engineer to design, develop, and maintain backend services and RESTful APIs using C#, .NET, and ASP.NET Core. You will design API contracts with OpenAPI/Swagger, implement secure internal and external integrations, and apply Clean Architecture, SOLID, DDD, CQRS, and MediatR patterns.

Responsibilities include authentication with OAuth 2.0 and OpenID Connect, JWT, and Microsoft Entra ID, data access with EF Core and SQL Server, and frontend work with

Qualifications

• 5+ years of professional software development experience, delivering enterprise applications.
• 5+ years of backend development using C# and .NET, including ASP.NET Core and RESTful APIs.
• 3+ years of frontend development, preferably Angular and TypeScript.
• Experience designing RESTful APIs and enterprise integrations.
• Strong knowledge of Clean Architecture, SOLID, DDD, CQRS, and distributed systems.
• Experience with EF Core, SQL Server, and Azure SQL.
• Knowledge of OAuth 2.0, OpenID Connect, JWT, and Microsoft Entra ID.
• 3+ years of experience with Azure and cloud-native app development.
• Experience with automated testing (xUnit/NUnit/Moq/Jasmine/Karma/Cypress).
• Familiarity with Git, CI/CD and GitHub Actions or Azure DevOps.
• Familiarity with Docker, Terraform, IaC, and DevSecOps practices.
• Experience troubleshooting complex backend, integration, and production issues.

Responsibilities

• Take ownership of features from design through production deployment and support.
• Design backend components, integrations, and API contracts.
• Translate business requirements into technical solutions.
• Collaborate with technical leads and architects to ensure quality.
• Develop and maintain cloud-native solutions on Azure, including App Service, Functions, Azure SQL, and API Management.
• Contribute to CI/CD pipelines, monitoring, and production troubleshooting.
• Review code and provide technical guidance to other developers.
• Ensure security, scalability, performance, and maintainability.

Tools

C#

.NET

ASP.NET Core

REST APIs

OpenAPI/Swagger

OAuth 2.0

OpenID Connect

JWT

Azure

Azure DevOps

Docker

Terraform

Entity Framework Core

SQL Server

Angular

TypeScript

CI/CD

GitHub Actions

Datadog

OpenAI Codex

Job description

Ifit Solutions is seeking a senior software engineer to design, develop, and maintain backend services and RESTful APIs using C#, .NET, and ASP.NET Core. You will design API contracts with OpenAPI/Swagger, implement secure internal and external integrations, and apply Clean Architecture, SOLID, DDD, CQRS, and MediatR patterns.

Responsibilities include authentication with OAuth 2.0 and OpenID Connect, JWT, and Microsoft Entra ID, data access with EF Core and SQL Server, and frontend work with