Desenvolvedor FullStack .Net/React Sênior in Brazil at Jobgether

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Desenvolvedor FullStack .Net/React Sênior based in Brazil.

We are looking for an experienced Senior Full Stack Developer to contribute to a strategic, high-complexity project in the fintech and insurance sectors. In this role, you will design and develop scalable, high-performance applications using modern cloud architecture. You will work across backend development with .NET and frontend development with React, leveraging AWS infrastructure and workflow automation technologies. You will play a key role in architectural decisions, technical quality, and engineering best practices. Working in a collaborative Agile environment, you will partner with architects, product managers, and business stakeholders. You will also mentor other developers and help deliver innovative solutions that enhance the experience of millions of customers.

• Design, develop, and maintain robust, scalable RESTful APIs using .NET, applying software architecture principles and established design patterns.

• Build modern, responsive, and high-performance user interfaces with React, ensuring excellent usability and user experience.

• Design and optimize PostgreSQL database schemas, queries, and data structures while maintaining data integrity.

• Architect and implement cloud-based solutions using AWS services such as EC2, RDS, S3, Lambda, and CloudFront.

• Develop and orchestrate business-critical workflows using N8N and implement asynchronous communication through RabbitMQ.

• Containerize applications with Docker to ensure consistency and reliability across development, testing, and production environments.

• Establish comprehensive automated testing practices, including unit testing and mutation testing with Stryker.NET.

• Maintain code quality through Git version control, code reviews, and adherence to engineering best practices.

• Participate in Agile/Scrum ceremonies, including sprint planning, daily meetings, reviews, and retrospectives.

• Mentor junior and mid-level developers, sharing expertise in architecture, coding standards, and technical solutions.

• Collaborate with architects, product managers, and business stakeholders to align technical decisions with business objectives.

• Bachelor's degree in Computer Science, Software Engineering, or a related field, or equivalent professional experience.

• 6–8 years of professional experience in full-stack software development.

• Strong expertise in .NET technologies, including C#, ASP.NET Core, LINQ, and Entity Framework or equivalent frameworks.

• Advanced experience with React, including Hooks, Context API, state management, and frontend performance optimization.

• Strong SQL and PostgreSQL knowledge, including database design and query optimization.

• Hands-on experience with AWS services such as EC2, RDS, S3, Lambda, and CloudFront.

• Experience with Docker and application containerization.

• Solid understanding of SOLID principles, design patterns, Clean Code, and scalable software architecture.

• Experience with RabbitMQ or other message-brokering and asynchronous communication technologies.

• Practical experience with automated testing frameworks, such as xUnit or NUnit for .NET and Jest or React Testing Library for React.

• Proficiency in Git, code versioning, and collaborative development practices.

• Experience working with Agile methodologies, particularly Scrum or Kanban.

• Ability to design and implement scalable, reliable, and high-performance applications.

• Excellent communication, collaboration, problem-solving, and technical leadership skills.

• A strong professional portfolio or GitHub repository demonstrating full-stack development experience.

Nice to have:

• Experience with N8N or other workflow orchestration and automation platforms.

• Familiarity with Stryker.NET for mutation testing and improving test coverage.

• Experience using AI-assisted development tools such as Claude Code or BMad.

• Knowledge of the insurance, fintech, or complex business operations sectors.

• Experience with microservices and service-oriented architectures.

• Familiarity with CI/CD pipelines and deployment automation tools such as GitHub Actions, GitLab CI, or Jenkins.

• Knowledge of application security and sensitive data protection.

• Previous experience leading or mentoring software development teams.

• Fluency in English.

• Contributions to open-source projects.

• Fully remote working model.

• Opportunity to work on a strategic, high-impact project in the fintech and insurance industries.

• Exposure to modern technologies, cloud infrastructure, and complex software architecture.

• Opportunities to take technical ownership and influence architectural decisions.

• Professional development through technical knowledge-sharing and collaborative engineering practices.

• Opportunity to mentor developers and strengthen technical leadership skills.

• Participation in an international technology and innovation ecosystem.

• Access to learning and professional development initiatives, including technical communities, leadership development, and educational partnerships.

• Inclusive working environment that values diversity, respect, and ethical collaboration.