I would like to build a AI platform like chatgpt

I'm looking to build an AI platform similar to ChatGPT. The platform should have advanced capabilities in text generation, conversation simulation, and question answering. I don't know which technology will be best for this...
Key Requirements:
- User-friendly interface
- High accuracy in AI responses
- Scalability to handle multiple users

Ideal Skills and Experience:
- Expertise in AI and machine learning
- Experience with natural language processing (NLP)
- Proficiency in developing web and mobile applications
- Strong background in software architecture

Please provide a portfolio showcasing similar projects.