Blockchain developer – how to hire the right professional

Maciej Zieliński

16 May 2021
Blockchain developer – how to hire the right professional

There are hundreds of new projects using blockchain technology every month around the world. It is estimated that by 2025, the value of the blockchain market will reach 39.5 billion. Therefore, blockchain remains one of the few industries where the demand for specialists so far exceeds the supply. In that case, which blockchain developer will meet your company's expectations and how to find one?

How much demand is there for Blockchain developers?

Entrepreneurs around the world are investing more and more money in blockchain development, and companies like JP Morgan, Oracle, Amazon, and Facebook are already using blockchain technology to handle their daily financial operations. 

If the number of top companies, including the world's largest banks and real estate giants, interested in blockchain technology is growing every day, there is basically no doubt that the demand for Blockchain developers is also growing. 

That's why LinkedIn has already rated blockchain as the most needed skill in 2020. And the U.S. Bureau of Labor Statistic has ranked Blockchain programmers among the fastest growing occupations in 2019-2020.

What skills a blockchain developer should have?

We have already written more about the skills needed by a Blockchain programmer in our article Blockchain programmer - how to become one?  

In a nutshell, every Blockchain programmer should understand the concept and tenets of Blockchain technology, cryptography, and be comfortable with topics such as tokens, smart contracts, decentralized applications and registries, and be fluent in the necessary programming languages. 

What programming languages should a blockchain programmer know?

The blockchain programmer you hire for your company should be proficient in all or most of the following programming languages:

  • C++
  • Scala
  • Python
  • Java
  • Javascript
  • Golang
  • Solidity

In addition, you should look for a blockchain developer who:

  • They previously worked with OOPS (Object-Oriented Programming Structure), this structure allows the program to be quickly updated when needed.
  • Deep understanding of language syntax makes a really big difference with Dapps
  • Be able to implement multithreading 
blockchain developer

Specific skills a Blockchain developer should have

A Blockchain developer should have a deep understanding of Blockchain technology and its applications. As a rule of thumb, a Blockchain programmer will be comfortable with the following concepts, which you should also be familiar with before interviewing him:

SHA (Security Hash Algorithm) - its familiarity is an absolute must, make sure that your company's Blockchain developer candidate knows the difference between SHA-1 and SHA-2 and can choose the right one for your application.

Encryption and decryption methods - necessarily along with a deep understanding of public and private key concepts. 

DLT (Distributed Ledger Technology) - a technology that allows data to be stored in multiple, distributed nodes rather than in a single location. The developer should be able to identify and explain its use cases in different Blockchain. 

Consensus- defines how new data is added to the blockchain (each node in the network must "agree" to add new information). A blockchain developer should distinguish between consensus methods such as PoS (Proof of Stake) and PoW (Proof of Work).

Tokenization - Tokenization is the process of converting both physical and non-physical assets into digital tokens using Blockchain technology. Every Blockchain developer should be able to create tokens and distinguish their basic types such as Utility, Security or NFT tokens. You can read more about them in our article: New token types – everything you need to know about them.

Dapps - decentralized, peer-to-peer applications.

Smart contracts - this is a self-enforcing contract in which the terms agreed between the parties are written directly into the lines of code. Smart contracts are the backbone of decentralized applications, where they allow for the abandonment of intermediaries. 

Various Blockchain Protocols - Currently, the most popular are Ethereum, Hyper Ledger Fabric and Corda. Blockchain projects mostly use one of these, so a Blockchain developer does not need to be proficient with all of them. On the other hand, his or her experience with them should certainly coincide with your needs. If you do not know which Blockchain protocol will work best for your project, our consultants can help you free of charge:

Public and Private Blockchain - A blockchain developer should understand and be able to explain the differences between the two and justify their different business uses.

blockchain developer

Where to find a Blockchain developer

Online forums

Online platforms, forums, and groups on sites like Facebook, Reddit, and the IEEE Blockchain Community can also prove to be good places to look for Blockchain developers


Nowadays, all such events have moved online, making it difficult but not impossible to find a blockchain developer at them. 


More and more universities are introducing courses focused on Blockchain. It is among their students and graduates that you will most easily find young people hungry for development and experience for the position of Blockchain programmer. 

Websites for freelancers

Among them, especially noteworthy are: CodementorXX-TeamToptal, BountyOne and Stack Overflow.

How to hire a Blockchain developer with Nextrope

We are a Polish software house providing Blockchain outsourcing services. We approach each project with great attention to detail and personal commitment. Among our clients there are revolutionary startups from financial and legal sector as well as one of the biggest banks in Poland - Alior Bank. You can read more about our success here. 

After years of work, we simply know the basics of fantastic projects. Want to find out why Nextrope - make an appointment for a free consultation:


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What is Account Abstraction?


10 Nov 2023
What is Account Abstraction?

Account abstraction is a new way of thinking about how users interact with blockchains. Instead of using traditional externally owned accounts (EOAs), account abstraction allows users to create and manage their accounts using smart contracts. This has a number of potential benefits, including improved security, enhanced privacy, and increased flexibility.

What is account abstraction?

Account abstraction is a concept that, at its core, aims to simplify the user's interaction with blockchain networks. It is a transformative approach that seeks to mask the technicalities of blockchain operations from end-users. It is making transactions as straightforward as sending an email. Account Abstr. allows users to interact with the blockchain without worrying about the underlying technical details.

How does account abstraction differ from the traditional model?

In the traditional account model, each user has an EOA. EOAs are controlled by private keys, which must be kept secret in order to protect the user's funds. Acc. abstraction allows users to create and manage their accounts using smart contracts.

Historical Context

The journey towards acc. abstraction began with the first generation of blockchain technologies, characterized by their "one-size-fits-all" approach to account management. Bitcoin, for instance, introduced the concept of accounts and transactions in a form that was accessible to tech-savvy individuals but remained perplexing to the layperson. Ethereum expanded on this by introducing smart contracts, which opened the door to programmable transactions but did not alter the fundamental account structure. The idea of acc. abstraction has been discussed in the Ethereum community for several years as a part of various Ethereum Improvement Proposals (EIPs), particularly as a feature to be potentially implemented in Ethereum 2.0. It is a direct response to the need for a more versatile and user-centric design that can cater to a broader audience and spur the widespread adoption of blockchain technology.

The Technicalities of Account Abstraction

Account abstraction is not merely a theoretical construct but a technical innovation with specific mechanisms underpinning its operation. In essence, it alters the way transactions are initiated and executed within a blockchain network.

How Account Abstraction Works

Under traditional blockchain models, initiating a transaction involves an externally owned account (EOA) signing a transaction with a private key. This transaction is then broadcast to the network for validation and inclusion in the blockchain. Account abstraction, however, replaces this process with a more flexible one. Here, every account is a smart contract, and transactions are messages sent through these contracts. These smart contracts can encode complex rules for transaction validation, beyond what EOAs can do, such as multi-signature requirements or conditional transactions based on certain triggers.

The technical crux of account abstraction lies in the smart contract’s ability to define its own conditions for transaction execution. This means that user accounts can have unique security protocols or automated operations without the user needing to understand the underlying smart contract code.

Hey! Are you interested in the latest technologies in the blockchain area? be sure to read the article 'Top Zero-Knowledge Proof Projects to watch in 2023'

The Benefits of Account Abstraction

The implications of account abstraction are profound, offering a range of benefits that can enhance the blockchain experience for users and developers alike.

Improved User Experience

One of the most significant advantages of account abstraction is the improvement it brings to user experience. By abstracting away the complexities of key management and transaction rules, it presents a more intuitive interface for users.

Enhanced Security Features

Account abstraction also allows for the implementation of advanced security measures. Since each account can define its own logic, users can tailor their security settings to their specific needs. For instance, one might set up an account that requires additional verification for transactions exceeding a certain value or restricts withdrawals to certain addresses.

Future Implications

The future implications of account abstraction are vast. As the technology matures, it could become a standard feature of blockchain networks, potentially making the current distinction between user accounts and smart contracts obsolete. This could lead to a new wave of blockchain applications that are both powerful and accessible, bringing us closer to the vision of blockchain technology as a seamless part of everyday life.

Challenges and Considerations

Technical Limitations

One of the primary technical challenges of Acc. abstraction lies in its integration with existing blockchain protocols. Current networks are optimized for the EOA model, and introducing a new account structure necessitates significant changes to the core protocol. This includes modifications to the way transactions are propagated in the network, how gas fees are calculated, and how the state of the blockchain is managed. Ensuring that these changes do not compromise the network's performance or security requires careful planning and extensive testing.

Compatibility with Current Systems

Another consideration is the compatibility of account abstr. with the vast ecosystem of existing blockchain applications and services. Wallets, exchanges, and other services have been built around the traditional account model. Transitioning to an acc. abstraction model will require these services to update their infrastructure, which may be a complex and resource-intensive process. Furthermore, there is a need for standardization across the industry to ensure that different implementations of account abstr. can work seamlessly together.


Acc. abstraction represents a significant leap forward in the quest for a more user-friendly blockchain experience. By streamlining the transaction process and offering enhanced security features, acc abstraction has the potential to make blockchain technology more accessible to a broader audience. However, the path to widespread adoption is not without its obstacles. Technical challenges and compatibility issues must be carefully navigated to integrate it into the existing blockchain landscape.

Key Takeaways

How to Add Gnosis Chain to MetaMask: A Simple Tutorial


03 Nov 2023
How to Add Gnosis Chain to MetaMask: A Simple Tutorial

As the cryptocurrency ecosystem expands, there is an increasing need for various blockchains with distinct capabilities. Gnosis Chain enters the scene, offering a selection of unique characteristics. By integrating Gnosis Chain with MetaMask, users can access a more comprehensive array of decentralized services. We will walk you through the steps to add Gnosis Chain to your MetaMask wallet in this tutorial.


Setting up MetaMask

Before exploring the integration of Gnosis Chain, it is crucial to have MetaMask installed and operational:

  • Download and Install: If you have not done so already, visit the official website to download and install the MetaMask browser extension.
  • Setup Account: After completing the installation, create your account and make sure to remember the provided seed phrase. This phrase serves as your primary means for account recovery, so keep it secure.
  • Secure Your Account: Protecting your MetaMask account is of utmost importance. Use a robust password and never disclose your seed phrase to anyone.

Gnosis Chain

It is always helpful to have a basic understanding before incorporating any new blockchain into your wallet:

  • Gnosis Chain Overview: Gnosis Chain, a rising star in the blockchain world, brings a range of decentralized solutions to the table, such as prediction markets and decentralized trading platforms.
  • Benefits & Features: Among Gnosis Chain's main selling points are its accelerated transaction speeds and potentially lower fees when compared to congested networks.

Tutorial: How to Add Gnosis Chain to MetaMask

In the top right-hand corner of your browser, you'll find the wallet. If pinned, click on the MetaMask fox icon; if not, click the three dots in the top-right corner. The following screen will appear:

An option to expand the wallet to a new browser page is available by clicking "Expand view:"

This action will launch MetaMask in a new tab:

By clicking on the ‘Ethereum mainnet’ in the top left corner, you can add another network. Click ‘Add Network’

Choose option ‘Add a network manually’

Then, input the information below:

Network Name: Gnosis Chain formerly xDai


ChainID: 100

Symbol: XDAI

Block Explorer URL:

After saving the settings, Gnosis Chain will be added to your network.

The Benefits of Adding Gnosis Chain to MetaMask

With multiple blockchains becoming more common, integrating Gnosis Chain with MetaMask offers numerous advantages:

Expanded Capabilities: Accessing Gnosis Chain through MetaMask opens up a collection of exclusive applications and features inherent to this particular blockchain, which may include unique dapps or cutting-edge financial products.

Diversification: The crypto domain is extensive and constantly growing. By incorporating various chains like Gnosis into MetaMask, you broaden your potential investment opportunities and decentralized application experiences, ensuring no opportunities are missed.

Speed & Cost-Effectiveness: Network congestion and high gas fees on established platforms like Ethereum can discourage many users. Gnosis Chain's architecture has the potential to provide relief through quicker transaction times and more affordable fees.

In summary, as the possibilities within the crypto sphere continue to evolve, tools like MetaMask grant users access to this expanding world. By adding chains like Gnosis, users can stay ahead in this decentralized revolution.


By bridging platforms like Gnosis Chain with accessible tools like MetaMask, individuals not only amplify their engagement with decentralized applications but also fortify their position in this expansive realm. The integration of Gnosis Chain to MetaMask epitomizes the evolution of the crypto landscape – a testament to its ever-growing diversity and potential. As we continue to delve deeper into the decentralized future, tools and integrations like these will undoubtedly play a pivotal role in shaping our digital experiences and opportunities. Whether you're seeking more efficient transactions, diverse dapp interactions, or simply a broader understanding of the crypto ecosystem, this guide's steps open doors to a new horizon.