You’re right, building a cryptocurrency exchange backend can be really challenging. For order matching, using an in-memory engine with event-driven tools like Kafka can help improve speed and reliability. Wallet management works best when you separate hot and cold wallets with auto reconciliation. For data consistency, event sourcing with CQRS is a solid approach. You can also look into Fourchain, a cryptocurrency exchange development company that offers scalable backend solutions for trading platforms, wallet management, and multi-chain integration.