Who is behind a blockchain?

First of all, Blockchain is a set of technologies that cooperate in order to historicize data and information in a persistent and secure manner. Cryptographic mechanisms, distributed database principles, and consensus protocols are usually used to achieve this goal.

The three main areas of expertise of a Blockchain developer:

1. Implementation of new Blockchain: the software engineer specialized in this area must have a solid understanding of the theoretical and practical principles governing Blockchain technology. He/she will be responsible for implementing database distribution protocols, communication protocols between Blockchain nodes, as well as protocols for achieving consensus. Expertise in peer-to-peer networks, cryptography, application network protocols, and software engineering is required.
2. Blockchain integration: A software engineer specializing in this area is responsible for creating systems that allow integration between different Blockchains (a rare but possible case) or integration of sidechains, i.e., "off-chain" Blockchains that support the main Blockchain in order to improve its scalability. The skills required are similar to the previous point, but with a specific focus on the area of integration.
3. Smart Contract Implementation: In this area, the developer is responsible for implementing one or more smart contracts that perform specific functions, often related to a business idea. It is necessary to have a deep understanding of the runtime environment in which the system will run, namely the Blockchain in which the smart contracts will be implemented. The choice of Blockchain itself could be an integral part of the implementation process, so it is important to know the pros and cons of the different blockchains available.

In terms of blockchain implementation, it's useful for a developer to have working knowledge of programming languages such as C++, Java (especially for the first two points), Go, and Python. In the context of smart contracts on the Ethereum network, knowledge of Solidity is essential.

It is important to note that these skills represent only part of the knowledge required for a Blockchain developer. Because blockchain technology is still evolving and has a wide range of applications, it is critical to keep up-to-date with the most widely used platforms.

Becoming a Blockchain developer or software engineer in the Blockchain field requires the acquisition of these skills, which can be obtained through a course of study in computer science or computer engineering for the theory and modeling part. Subsequently, experience can be gained by working on complex projects within development teams in software companies, consulting firms or even startups.