Hello there, thank you for this opportunity to connect with you. I am a multi-blockchain developer with Nxt/Ardor, Bitcoin (bitcoind), Ethereum, and Stellar. I can create wallets for these and also with other cryptocurrencies. I am also a full-stack Java architect/developer with over 16 years of experience, a multi-framework expert with Spring, JHipster, Grails, and JEE.
In addition to projects in my reviews, please see my other blockchain/cryptocurrencies projects here in Freelancer involving wallets:
https://www.freelancer.com/projects/html/Ethereum-blockchain-project/
https://www.freelancer.com/projects/javascript/build-api-proof-concept/
In the first one I have created the ERC20 coin as well and also conducting the crowdsale.
I hope we can further discuss your requirements for this project in a chat. Please see my profile for the rest of my portfolio and qualifications. Thank you very much.