Wearable Crypto Wallet Development

I need a skilled electronics engineer to design and put into production a hardware design for a wearable gadget that functions as a cryptocurrency transaction system. You will be given a completed spec for functionality and logic including all of the cryptographic algoriths. The hardware design and production is all that remains to be done.

Key requirements include:
- Robust security features (e.g. encryption, PUF)
- Durable and lightweight design for wearability

Ideal skills and experience:
- Experience in developing secure electronic devices, especially in the cryptocurrency domain
- Strong background in UX/UI design for wearable technology
- Knowledge of the latest security protocols in cryptocurrency transactions
- Proficiency in hardware and software integration

Please provide a portfolio showcasing similar projects.