Mid-Level .NET Developer

Jobgether

Brasil

Remote

BRL 120,000 - 180,000

Full time

9 days ago

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Benefits offered by this job

Health and dental insurance

Meal and food allowances

Childcare assistance

Extended paternity leave

Wellness partnerships (Gympass/TotalIf

Profit Sharing and Results Particip.

Life insurance

Learning platform access

Employee discount club

Well-being resources

Language-learning platform

Online courses partnerships

Job summary

Jobgether is partnering to find a Mid-Level .NET Developer based in Brazil. You will maintain and modernize ASP.NET/.NET Core apps with a React frontend, focusing on strengthening security via OAuth2/OIDC/JWT and upgrading to newer .NET Core versions.

You will work across AWS, MySQL/PostgreSQL, and external APIs, using Git/Bitbucket, Playwright tests, and CI/CD pipelines. Strong English communication with stakeholders is essential in this remote engineering environment.

Qualifications

Minimum 5 years of professional .NET development with C# and web tech.
Experience designing/authenticating with OAuth2/OIDC/JWT.
Experience upgrading apps across .NET/.NET Core versions.
Production React apps experience.
AWS and relational DBs such as MySQL or PostgreSQL.
Experience with third-party API integrations.
Git/Bitbucket source control proficiency.
Automated testing with Playwright is a plus.
Understanding of CI/CD pipelines and automated testing/deploy.
Advanced English communication with stakeholders.

Responsibilities

Maintain and enhance web apps built with ASP.NET, .NET Core, and React.
Design and modernize authentication/authorization systems.
Plan upgrades to newer .NET Core versions.
Develop and maintain React apps with .NET backend.
Work with AWS and relational databases (MySQL/PostgreSQL).
Integrate third-party APIs and services.
Utilize Bitbucket/Git for source control.
Implement automated testing with Playwright.
Contribute to CI/CD pipelines for testing and deployment.
Communicate requirements and priorities with stakeholders.
Collaborate to improve performance and security.

Skills

5+ years .NET experience

React development

OAuth2/OIDC/JWT

CI/CD pipelines

Playwright testing

English proficiency

Team collaboration

Tools

AWS

MySQL

PostgreSQL

Bitbucket

Git

Playwright

Job description

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.

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

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

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

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

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

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

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

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

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

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

Requirements:

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

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

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

Professional experience developing and maintaining React applications in production environments.

Experience working with AWS and relational databases, particularly MySQL and PostgreSQL.

Familiarity with third‑party API integrations and external service connectivity.

Comfortable using Git and Bitbucket for source control and collaborative development workflows.

Experience with automated software testing; knowledge of Playwright is an advantage.

Understanding of CI/CD pipelines and automated testing and deployment practices.

Advanced English proficiency, with the ability to communicate clearly and confidently with stakeholders.

Strong problem-solving, collaboration, and communication skills, with the ability to understand requirements and contribute to technical prioritization.