Blockchain Developer

A blockchain developer is a type of software developer who works with blockchain technology. Blockchain is a decentralized data storage solution that can be used by the public; what makes it so unique is that any data sent over blockchain is not stored in a central location or by a third party.

Core Blockchain Developer

As discussed earlier, a core blockchain developer is generally involved in the design, architecture, and security of a blockchain system. In brief, their roles include the following:

• Design of blockchain protocols
• Design of consensus protocols and security patterns for the network
• Design of the network architecture
• Supervision of the entire network

Blockchain Software Developer

blockchain software developers build decentralized applications or "Dapps" using blockchain technology. Their roles include:

• Development of Smart Contracts
• Development of interactive front-end designs for Dapps
• Backend development pertaining to Blockchain
• Supervision of the entire stack running their Dapps

Blockchain Architecture

A blockchain developer should have an excellent understanding of blockchain, it's working, and its architecture. Concepts like cryptographic hash functions, consensus, distributed ledger technology should be at the tip of their fingers.

let’s checkout some of the challenges that a blockchain developer faces:

1. Security
2. Resource Management
3. Performance
4. Isolation
5. scalable

C++

One of the most used coding languages in Blockchain development is C++ , This object-oriented programming language has a short learning curve, which makes it easier for even those who are new to the language.Bitcoin, the popular Cryptocurrency, is one of the most popular testaments to this statement because bitcoin core, the inner system of bitcoin is coded in C++. personally i suggest learn QT Too.

important things about C++:

• Initial implementation by Satoshi was written in C++
• Core logic on blockchain is compute intensive (C++ performs better than Java and 10x - 20x better than Python in this area)
• Languages like Java/Python can’t run on GPU (One would need a C++ layer beneath Python that can make use of GPU). GPU is essential to calculate hashes for some blockchains.

Feature of C++ :

• Memory Control
• Threading
• Move Semantics
• Compile Time Polymorphism
• Code Isolation
• Maturity

JavaScript

Along with HTML and CSS it is one of the three core technologies in World Wide Web Content Production. Javascript is usually used to create highly interactive webpages.

The developers of Lisk chose Javascript because they felt that blockchain technology wasn’t being adopted into the larger software development world fast enough and that by building a blockchain in Javascript they’d be able to tap into a huge pool of Javascript developers. According to Github, Javascript is, by far, the most used development language.

who use java script?

1. Ark : Ark is another new cryptocurrency using Javascript, with the aim of creating “Smart Bridges” between existing blockchains.
2. Nimiq : Nimiq takes the idea of a Javascript-based cryptocurrency even further, by making it browser-based. When you connect to a website running Nimiq, you’re actually connecting directly to the Nimiq network using Websockets and WebRTC. You can even mine Nimiq in your browser.

Javascript Bitcoin Wallets

Many older cryptocurrencies use QT as their desktop wallet platform, but more and more cryptocurrencies are turning to Electron. Since Electron uses Javascript along with HTML and CSS, they’re able to create more modern-looking wallets that users have come to expect and to easily compile the wallet to work on Windows, Mac, or Linux. Most multi-currency wallets, like Exodus, have also gone this route.

Python

Contrary to C++, Python is a scripted language that doesn't require compilation to become understandable to machines, which makes developers’ lives more comfortable.

If you're using a compiled language, to fix it, you'll have to stop the application, return to the source code, fix the bug, recompile the code, and restart your application. In Python, all it takes is fixing the bug and reloading your application , you won't have to recompile code. And that's a massive advantage in building blockchains.

"free packages for Blockchain" Another significant advantage of using Python in a Blockchain project is that it offers developers a collection of free packages to help them write code more efficiently. Have a look at this page to see a complete list of these libraries: Python Library For Blockchain.

The first reason being is that Python is more advanced and a lot more 'cleaner' than its main competitor, C++ .(please write your comment about this).

Python is really useful for big data and  Machine learning. It is also very elegant and useful for all kind of prototypes, because you can write code and manipulate complicated structure in an easy, understandable way.

Distributed storage 

Blockchain is a distributed ledger technology for recording transactions between two or more parties. The blockchain ledger serves as a decentralized database that maintains details about each transaction. The transactions are added to the ledger in chronological order and stored as a series of blocks. Each block references the preceding block to form an interconnected chain.The ledger is distributed across multiple nodes, with each node maintaining a complete copy. Blockchain automatically synchronizes and validates the transactions across all nodes. The ledger is transparent to and verifiable by all participating members, eliminating the need for a central authority or third-party verification service.

A blockchain-based storage system prepares the data for storage and then distributes it across a decentralized infrastructure, a process that can be broken into the six steps that follow:

1. Create data shards.
2. Encrypt each shard
3. Generate a hash for each shard.
4. Replicate each shard
5. Distribute the replicated shards.
6. Record transactions to the ledger.

5 Best Data Processing Frameworks can be used for the distributed storage and processing of data :

1. Hadoop
2. Apache Spark
3. Apache Storm
4. Samza
5. Flink

GO

code style:

•  Indentation, spacing, and other surface-level details of code are automatically standardized by the gofmt tool. golint does additional style checks automatically.
•  Tools and libraries distributed with Go suggest standard approaches to things like API documentation (godoc), testing (go test), building (go build), package management (go get), and so on.
•  Go enforces rules that are recommendations in other languages, for example banning cyclic dependencies, unused variables or imports, and implicit type conversions.
•  The omission of certain features (for example, functional-programming shortcuts like map and Java-style try/finally blocks) tends to encourage a particular explicit, concrete, and imperative programming style.

Highlights

•  Statically typed, scalable to large systems (as Java and C++)
•  Productive and readable, without too many mandatory keywords and repetition "light on the page" like dynamic languages
•  Doesn’t require IDE integrated development environment, but supporting them well
•  Support networking and multiprocessing

What you will be able to do

• Create your own blockchain
• Understand how hashing works in maintaining integrity of the blockchain
• See how new blocks get added
• See how tiebreakers get resolved when multiple nodes generate blocks
• View your blockchain in a web browser
• Write new blocks
• Get a foundational understanding of the blockchain so you can decide where your journey takes you from here!

 popular blockchains developed using GO

• HyperLedger Fabric
• ETHEREUM
• Dero
• GoChain

Solidity

Solidity is an object-oriented, high-level language for implementing smart contracts. Smart contracts are programs which govern the behaviour of accounts within the Ethereum state.

Solidity was influenced by C++, Python and JavaScript and is designed to target the Ethereum Virtual Machine (EVM).

Solidity is statically typed, supports inheritance, libraries and complex user-defined types among other features.

With Solidity you can create contracts for uses such as voting, crowdfunding, blind auctions, and multi-signature wallets.

When deploying contracts, you should use the latest released version of Solidity. This is because breaking changes as well as new features and bug fixes are introduced regularly. 

also read : truffle framework and web3js.