Node.js WebSockets Expert for Collaboration Tool

I'm looking for a Node.js expert who is well-versed in WebSockets. The project involves developing real-time collaboration tools.

Key Requirements:
- Utilize WebSockets for real-time data transmission
- Integrate seamlessly with existing REST APIs and databases
- Collaborate with frontend frameworks like React or Angular

Ideal Skills:
- Strong expertise in Node.js and WebSockets
- Experience with REST APIs and database integration
- Proficient in frontend technologies, especially React or Angular
- Background in building real-time collaboration tools

Please share your portfolio and relevant experience.