What technical Skills are needed to become a Blockchain Developer?

There are two parts of the answer:

Part 1: You need to be a Developer. If you are a developer, jump to part 2.

The developer always(not always) think about breaking the problem logically and quantifying the data.

Have an understanding of fundamental of programming including OOPs, procedural language, flat and relational database.

Understanding of Data structures is a must have skills to learn any technology.

Understanding of Data Structures including Stack, Queues, LinkedList, Tree, and Hedera HashMaps. You should also understand the time and resource complexity of querying a data structure.

As blockchain technology is decentralized, it also means you should be writing very efficient code, which means not consuming processing, memory or network bandwidth.

Bad code is just too expensive in the decentralized architecture.

Understanding of basic architectures like MVC, MVVM, Document-View Architecture, Microservices could help in deeply understanding the differences between convention and Decentralized architecture.

Also, learn fundamentals of Communication Architectures including but not limited to Publisher subscriber, a Message broker, Bus architecture will be useful.

Most importantly, you should be comfortable with any one of the programming language. It could be C, C++, JavaScript or anyone that you can learn. I believe that the programing language itself doesn't matter.

Part 2: Becoming a Blockchain developer:

You don't need anything specific to learn blockchain. Although having an understanding of centralized and distributed network will help you understand what value does decentralized architectures as Blockchain brings to the table.

To start coding an application on the blockchain, in 2018, I will pick a platform like Hyper Ledger, Ethereum, EOS or HashGraph. The coding on blockchain is not complicated as the underlying technology works of its own, and you are mostly writing your business layer in JavaScript most of the time.

If you are a coder( I mean it), then jump to courses on udemy and spend watching videos for 8 to 12 hours and you will know what and how to write applications on blockchain technologies.

I have reskilled myself and my company to Blockchain technologies. I am a programmer, and I have shipped 100+ digital solutions in last ten years across technologies at leewayhertz.com

I hope this information is useful and I plan on updating my answer as the blockchain and decentralized technologies are maturing every day.