Real-Time NodeJS Server Development

I'm looking for an experienced NodeJS developer to build a server focused on real-time data processing, specifically financial transactions. The server will need to support live chat, real-time notifications, and activity monitoring.

Key Requirements:
- Process financial transactions in real-time.
- Implement live chat, real-time notifications, and activity monitoring features.
- Ensure high availability and low latency.

Ideal Skills and Experience:
- Strong expertise in NodeJS.
- Experience with real-time data processing.
- Background in financial transaction systems is a plus.
- Knowledge of web sockets and event-driven programming.
- Familiarity with database technologies suitable for real-time applications.

Please provide examples of similar work done.