A blockchain developer is a key player in developing and implementing blockchain technology. They are responsible for developing and managing decentralized applications (DApps) and creating new blockchain platforms. They need to have a strong understanding of cryptography, computer science, and mathematics. Five core skills, blockchain architecture, cryptography, programming languages, smart contracts and data structures are required to become a blockchain developer. Acquiring these skills allow blockchain developers to create secure, decentralized networks that store transaction records and other information.