Sign an XML using private key for Experian BIG SOAP request

I am looking for a skilled developer who can sign an XML using a private key for an Experian BIG SOAP request.

Documentation, examples and certificate will be provided.

Skills and Experience:
- Proficiency in Node.js programming language
- Experience with XML signing using private keys
- Familiarity with Experian BIG SOAP request

Project Requirements:
- The developer should have access to a private key for signing the XML
- The XML signing process should be implemented using Node.js
- The signed XML should be compatible with Experian BIG SOAP request

Timeline:
- The project needs to be completed as soon as possible.

Please include your relevant experience and showcase any similar projects you have worked on in your proposal.