They are hiring blockchain developers with expertise and experience in platforms like Ethereum and Hyperledger, smart contract development, and decentralized application (DApp) development. They should have a strong understanding of development tools and programming languages and experience working on similar blockchain projects. Additionally, expertise in specific blockchain platforms, such as Bitcoin or Ethereum, and the ability to work with libraries and APIs. Developers have strong problem-solving skills, adapt to the latest technology in the rapidly evolving blockchain, and communicate effectively with non-technical staff.