Senior Backend Engineer (NestJS & ReactJS)

**Backend Engineer ( NestJS \& React.JS)** **Sao Paulo, Brazil** **Long term Contract** **Key Responsibilities:** * Design, develop, and maintain scalable backend services using NestJS and Node.js * Build and integrate RESTful and/or GraphQL APIs for frontend and external systems * Collaborate closely with frontend engineers using React.js to deliver seamless user experiences * Architect and implement cloud\-native microservices on Google Cloud Platform * Develop event\-driven systems using messaging/streaming platforms (e.g., Pub/Sub, Kafka, etc.) * Ensure application security, performance, scalability, and reliability * Implement authentication, authorization, and data protection best practices * Write clean, maintainable, and well\-tested code following industry best practices * Participate in code reviews, technical design discussions, and architectural decisions * Troubleshoot production issues and optimize system performance * Work closely with DevOps teams on CI/CD pipelines, monitoring, and deployments **Required Skills \& Qualifications:** * Strong experience in Backend development using NestJS and Node.js * Hands\-on experience with React.js (integration and collaboration with frontend teams) * Solid understanding of API\-driven architectures (REST / GraphQL) * Experience building microservices and event\-driven systems * Strong experience with Google Cloud Platform (GCP) services * Experience with containerization (Docker) and orchestration (Kubernetes is a plus) * Knowledge of databases (SQL and/or NoSQL) * Strong understanding of security best practices and scalable system design * Excellent problem\-solving and communication skills