Mid-Level .NET Developer

About the role

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Mid-Level .NET Developer based in Brazil.

The Mid-Level .NET Developer will contribute to the maintenance, modernization, and continuous improvement of web applications built with .NET and React. A key focus will be strengthening application security by modernizing authentication and authorization systems while upgrading existing solutions to newer .NET Core versions. You will collaborate with technical teams and communicate directly with stakeholders to understand business needs and prioritize development work. The role involves working across cloud infrastructure, relational databases, third-party integrations, and automated delivery pipelines. You will help ensure applications remain secure, reliable, maintainable, and aligned with evolving technical requirements. This is an opportunity to contribute to application modernization within a collaborative, remote engineering environment.

Accountabilities: -

Maintain, enhance, and support existing web applications developed using ASP.NET, .NET, and .NET Core.

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Design, implement, and modernize authentication and authorization solutions using OAuth2, OpenID Connect (OIDC), JSON Web Tokens (JWT), and identity providers.

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Plan and execute upgrades to newer .NET Core versions, ensuring application compatibility, stability, and maintainability.

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Develop and maintain production applications using React alongside .NET technologies.

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Work with AWS cloud services, relational databases such as MySQL and PostgreSQL, and external services.

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Integrate third-party APIs and services to extend application functionality and support business requirements.

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Use Bitbucket and Git-based version control practices to manage source code and collaborate effectively with the development team.

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Implement and maintain automated testing practices, using tools such as Playwright to improve application quality and reliability.

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Work with CI/CD pipelines to automate testing, integration, and deployment processes.

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Communicate in English with stakeholders to clarify requirements, discuss priorities, and align development activities with business needs.

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Collaborate with team members to deliver maintainable solutions and continuously improve application performance and security.

Requirements:

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At least 5 years of professional experience in .NET development using C# and web technologies.

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Proven experience designing, implementing, and maintaining authentication and authorization systems.

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Hands-on experience upgrading applications across .NET and .NET Core versions.