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Ssr Fullstack Dev (ReactJS + Node.js) at Workana. We are looking for a Semi-Senior Full Stack Developer (ReactJS + Node.js) to join the team of our client, a company specialized in developing automation and AI-powered chatbot solutions.. Responsibilities:. . Develop and maintain SaaS applications using . ReactJS. and . Node.js (Express). . . . Design and build . reusable components. with modular and scalable architecture. . . Integrate and consume . REST APIs. (OAuth, webhooks) and third-party services. . . Implement and optimize solutions using . LangChain, LangGraph, and RAG. . . . Integrate and query . vector databases. for conversational AI workflows. . . Implement . OCR document processing. for information extraction and analysis. . . Collaborate in . agile environments. following best practices in . Git. and clear documentation. . . Mandatory Requirements:. . Proven experience with . ReactJS. (reusable components, hooks, performance optimization). . . Solid experience with . Node.js and Express (4+ years). . . . Advanced knowledge of . TypeScript. . . . Experience integrating . REST APIs. with . OAuth authentication. and . webhook handling. . . . Experience with . PostgreSQL and/or MongoDB. . . . Previous experience working with . SaaS environments. or modular platforms. . . Nice to Have:. . Hands-on experience with . LangChain, LangGraph, and RAG. . . . Experience with . Vector Databases. (e.g., Pinecone, Weaviate, Milvus). . . Implementation of . Document OCR. for text processing in images/PDFs. . . Experience with . microservices architecture. and . cloud deployments. (AWS, Docker, CI/CD).. . Company Location: Argentina.