***Technical Requirements (Mandatory)*** **Frontend** * \- React with Class Components and Functional Components * \- TypeScript and JavaScript ES6\+ * \- GraphQL API consumption * \- WebSockets (real-time) * \- HTML5 / CSS3 **Backend** * \- Node.js \+ Express * \- GraphQL (e.g., Apollo, Yoga, Mercurius) * \- WebSockets (e.g., ws, socket.io or equivalent) * \- Redis (as cache or pub/sub) * \- SQL or NoSQL databases * \- AWS integrations * \- DevOps / Infrastructure * \- Familiarity with CI/CD pipelines * \- Monitoring and logging (CloudWatch, Datadog, Sentry or similar) **Nice-to-Have (Desirable)** * \- Experience with Messaging Systems (SQS, SNS, Kafka, RabbitMQ, etc) * \- Microservices Architecture * \- Serverless (AWS Lambda) * \- Automated testing (unit and/or integration) * \- Security best practices (OWASP, JWT, OAuth2, etc) Job Type: Freelance / PJ Compensation: R$7\.500,00 \- R$9\.500,00 per month