Anh Duc N.

I’m a Full-Stack Developer and AWS Cloud Engineer with approximately 5 years of experience building, integrating, and maintaining web applications and cloud-based systems. I combine practical software engineering experience with hands-on AI development skills, particularly in Retrieval-Augmented Generation (RAG), LLM integration, and document-based AI applications. My focus is on delivering reliable, maintainable solutions — from frontend interfaces and backend APIs to cloud infrastructure and AI-powered features. What I Can Help You With AI & RAG Development * Build document-based AI chatbots using Python, LangChain, and ChromaDB. * Implement document loading, chunking, embeddings, and semantic search. * Integrate LLM APIs with existing applications. * Develop RAG pipelines with different retrieval strategies. * Prototype AI agents and tool integrations using LangChain and LangGraph. Full-Stack Development * Build responsive web applications using Next.js, React, and TypeScript. * Develop REST APIs with Node.js, NestJS, and Python. * Integrate databases and external services. * Troubleshoot frontend, backend, and database integration issues. AWS Cloud Engineering * Compute: EC2, Lambda * Storage: S3, EBS * Networking: VPC, security groups, networking fundamentals * Databases: RDS, DynamoDB * Infrastructure as Code: AWS CloudFormation * Identity & Access Management: IAM, AWS Organizations * Deployment & Operations: CodeDeploy, CloudWatch, application monitoring, and troubleshooting Technical Stack * AI & LLM: LangChain, LlamaIndex, RAG, embeddings, ChromaDB, Ollama, LLM API integration * Backend: Python, Node.js, NestJS, REST APIs * Frontend: Next.js, React, TypeScript, Tailwind CSS * Databases: MySQL, Microsoft SQL Server, Prisma ORM * Cloud: AWS EC2, Lambda, S3, RDS, DynamoDB, CloudFormation, IAM, CloudWatch * Development Practices: Agile, debugging, technical documentation, deployment, and production support Certifications * AWS Certified Solutions Architect – Associate * AWS Certified Developer – Associate * AWS Certified SysOps Administrator – Associate * IBM AI Developer Professional Certificate Why Work With Me? My experience spans both application development and real-world system operations. I understand not only how to build features but also how to integrate, deploy, troubleshoot, and maintain them. I value clear communication, practical architecture, clean code, and predictable delivery. Whether you need a working RAG chatbot prototype, an AI feature integrated into your existing application, a full-stack web solution, or AWS cloud support, I’d be happy to discuss your requirements.