Senior Java developer 10 yrs+ blockchain wallet refactor

I am looking for a senior Java developer from Eastern Europe with at least 10 years of experience to help me with a major refactor of our existing blockchain wallet system. This project is for an existing business and the goal is to change the signature algorithm in a multiparty computation.

Scope of the refactoring:
- Major refactor to improve functionality

Timeline expectations:
- 6 weeks est

Ideal skills and experience:
- Java Spring, Security, Cryptography
- At least 10 years of experience as a Java developer
- Strong understanding of blockchain technology and wallet systems
- Experience with refactoring and improving the functionality of existing systems
- Knowledge of security protocols and best practices in blockchain development
- Ability to work independently and meet project deadlines