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Polina, Web3 Software Engineer

Last Updated: 25 Jan 2024

-Software Engineer with 5 years of professional experience, working across eCommerce & retail, Marketplace, Healthcare, Entertainment, Education, and Blockchain, Game domains. -Proficiency in PHP, JavaScript, TypeScript, React - Knowledge of Vanilla JS, Native PHP, PHP-Selenium - Experience working with Web3 marketplaces, nodes, on-chain, and off-chain transactions - Knowledge of Web3, understanding of Abi, Smart Contracts; Tampermonkey, Greasyfork - Knowledge Css3, Bootstrap 4; RPC; GitHub; MySQL - Has a successful track record of developing applications from scratch and optimizing existing systems, evidenced by projects such as a Learning Platform, Event Manager, and a Website for a Coin Game - Computer Science and Software Engineering Foundation

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PHP   5 yr.


JavaScript   5 yr.


TypeScript   1 yr.



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Kris, Blockchain & Full Stack Software Engineer

Last Updated: 5 Mar 2024
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Programming Skills Verified

- Engineer who has 6+ years of experience with many programming languages, frameworks, and platforms; - 2+ years experience with developing smart contracts on Rust; - Solid skills with Solidity; - Working experience in building an NFT marketplace platform on Polygon and Binance Smart Chain using ERC-721 and ERC-1155; - Experience with ether.js, web3.js, and JS/TS frameworks; - Familiar with blockchain Ethereum, Binance, Tron, Solana, Polkadot, Tezos, Polygon, Huobi ECO chain, etc; - Deep knowledge in implemented Metamask, Torus, and other wallets to increase user experiences with the web apps; - Advanced English; - Available ASAP.

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Rust   2 yr.

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Tina, Solidity Smart Contract Developer

Last Updated: 4 Jul 2023

- Experience working with Solidity; - Good understanding of Blockchain technology; - 3+ years of experience in Smart Contract development; - Deep skills with Hardhat, and Truffle; - Experience working with ethers.js and Web3.js; - Good knowledge of Ethereum, and BNB Chain; - Experience working on dApps, DeFi, and NFT projects; - In-depth abilities in creating and deploying ERC20, ERC721, ERC1155, BEP20, and BEP721 tokens; - Intermediate English.

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Martin C., Expert Rust/Solidity Smart Contract Blockchain Developer

Buenos Aires, Argentina
Last Updated: 4 Jul 2023

-As a senior Programmer and Blockchain developer, with over 6 years of development, I am an expert in NFT Website, NFT Art Generation, and NFT Marketplace, Solidity, Web3, EVM based network chains, Custom smart contracts, ERC20/721, ERC1155, NFTs, IDO's, Bridges Block explorers, UI Web3 Dapps Integration, IPFS. - Smart Contract Development (Solidity/ Rust/ Anchor Framework/ Cosmwasm) - Cardano smart contract by utilizing CosmWasm smart contract by utilizing Rust CosmWasm. - Solanasmartcontractimprovement(Unittest,Solana-program-library,Solana-web3,Raydiumtradeandorca)by utilizing Rust and Anchor system. - Polkadot Relay Chain using Substrate in Rust programming. - Smart contract advancement in networks (Ethereum, BSC, Matic/Polygon) by utilizing Solidity. - Uniswap V2, V3, Curve (Yearn, Convex), Sushiswap, Quickswap, etc. - Written smart contracts for ERC20, ERC223, ERC721, ERC1155, ICOs, airdrop, Vesting, MultiSig, Wallet, etc - DeFi, Dex protocols - Front-end development with Smart contract integration by utilizing Web3, truffle. React (Redux/Thunk/Saga), Typescript, Node js. - NFT minting website andNFT marketplace development(Create a listing by admin, flat&Crypto payment,Bundle Sale/ Bulk Transfers, Drop)

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Vladislav, Team Lead / Software Engineer

Last Updated: 18 Jan 2024

-Software Engineer with 7 years in the tech industry, with a robust computer science and software engineering background. - Strong knowledge of Vanilla PHP and JavaScript and front-end and back-end development skills. -Expertise spans prominent domains such as eCommercee& retail, Marketplace, Blockchain, Entertainment, Game dev, Social Network, Healthcare, Analytics, Education -Incorporated advanced technologies like Web3.js and Elasticsearch into projects, demonstrating a balance of front-end and back-end skills. -Capabilities extend beyond app architecture, database design, and optimization with MySQL and other databases. -Proven track record of leveraging Docker and Nginx for DevOps, underpinned by a solid grasp of Git. -Has effectively fulfilled the role of Team Lead, showcasing skills in mentorship, code review, and workflow optimization.

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PHP   7 yr.


JavaScript   6 yr.


TypeScript   3 yr.



Vanilla JS

Vanilla JS

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Table of Contents

How and where is Web3.js used?

Case NameCase Description
Decentralized Finance (DeFi)Web3.js enables developers to build decentralized finance applications on blockchain networks. DeFi applications allow users to lend, borrow, and earn interest on digital assets without the need for intermediaries such as banks. With Web3.js, developers can interact with smart contracts, access decentralized exchanges, and integrate various DeFi protocols into their applications.
Non-Fungible Tokens (NFTs)Web3.js provides the necessary tools to create, manage, and interact with non-fungible tokens. NFTs are unique digital assets that represent ownership or proof of authenticity for items such as artwork, virtual real estate, or collectibles. Developers can leverage Web3.js to implement features like minting, transferring, and displaying NFTs in their applications.
Decentralized Social MediaWeb3.js enables the development of decentralized social media platforms that prioritize user privacy, data ownership, and censorship resistance. By leveraging blockchain technology, developers can build social media applications where users have full control over their data and can interact directly with each other without relying on centralized platforms. Web3.js facilitates the integration of blockchain functionalities like user authentication, content publishing, and decentralized storage into these platforms.
Supply Chain ManagementWeb3.js can be utilized to create transparent and secure supply chain management systems. By leveraging blockchain’s immutability and transparency, developers can build applications that track and verify the origin, authenticity, and movement of products throughout the supply chain. Web3.js allows developers to interact with smart contracts that store and update supply chain data, ensuring trust and accountability among participants.
Gaming and Virtual RealityWeb3.js can transform the gaming and virtual reality industries by enabling the creation of decentralized gaming platforms and virtual worlds. Developers can utilize Web3.js to integrate blockchain functionalities like asset ownership, in-game economies, and provable fairness into games and virtual reality experiences. This opens up new opportunities for players to truly own and trade in-game assets, as well as participate in decentralized virtual economies.

What are top Web3.js instruments and tools?

  • Web3.js: Web3.js is a JavaScript library that provides a convenient interface for interacting with the Ethereum blockchain. It was initially released in 2014 and has since become the de facto standard for building decentralized applications (dApps) on Ethereum. Web3.js allows developers to interact with smart contracts, send transactions, and retrieve blockchain data easily. It supports both browser and Node.js environments, making it versatile for various development needs.
  • Truffle: Truffle is a popular development framework for Ethereum dApps. It provides a suite of tools that streamline the process of building, testing, and deploying smart contracts. With Truffle, developers can easily compile and migrate contracts, write tests, and interact with their contracts through a user-friendly console. It also offers built-in support for popular Ethereum development standards like ERC-20 and ERC-721, making it a go-to choice for many Ethereum developers.
  • Ganache: Ganache is a personal Ethereum blockchain that developers can use for local testing and development. It provides a local blockchain environment where developers can deploy and interact with smart contracts without the need for expensive transactions on the main Ethereum network. Ganache also offers advanced features like customizable gas limits and automated contract testing, making it an essential tool for Ethereum developers.
  • Infura: Infura is a powerful API service that allows developers to connect to the Ethereum network without running their own Ethereum node. It provides reliable and scalable access to the Ethereum network, making it easier for developers to build decentralized applications. Infura handles the complexities of managing and syncing with the Ethereum network, allowing developers to focus on building their applications rather than infrastructure management.
  • Ethers.js: Ethers.js is a lightweight and powerful JavaScript library for interacting with Ethereum. It offers a simple and intuitive API for managing accounts, sending transactions, and interacting with smart contracts. Ethers.js also provides advanced features like contract factories, allowing developers to easily deploy new smart contracts programmatically. With its elegant design and comprehensive functionality, Ethers.js has gained popularity among Ethereum developers.
  • Solidity: Solidity is the most widely used programming language for writing smart contracts on the Ethereum platform. It is a statically typed language with syntax similar to JavaScript, making it accessible to developers familiar with web development. Solidity offers features like inheritance, libraries, and interfaces, enabling developers to build complex and modular smart contracts. Solidity has been instrumental in the growth of the Ethereum ecosystem, powering countless decentralized applications.
  • Remix: Remix is a web-based IDE (Integrated Development Environment) specifically designed for developing and testing smart contracts. It provides a user-friendly interface where developers can write, compile, and debug their Solidity code. Remix also offers powerful features like static analysis, gas estimation, and contract deployment to various Ethereum networks. It is a valuable tool for both beginner and experienced smart contract developers.

Cases when Web3.js does not work

  1. Browser Compatibility: One of the common cases when Web3.js may not work is due to browser compatibility issues. Web3.js relies on the capabilities of the user’s web browser to execute its functions. However, not all browsers fully support Web3.js or its required technologies such as JavaScript, HTML5, and WebSocket. Therefore, if a user is using an outdated or incompatible browser, certain features of Web3.js may not work as expected.
  2. Network Connectivity: Web3.js allows communication between the user’s web browser and the Ethereum network. However, if the user’s device or network connection is experiencing connectivity issues, Web3.js may fail to establish a connection with the Ethereum network. This can result in the failure of various Web3.js functions, such as sending transactions, retrieving contract data, or interacting with smart contracts.
  3. Incorrect Configuration: Web3.js requires proper configuration to connect to the desired Ethereum network. If the configuration parameters are incorrectly set or missing, Web3.js may not be able to establish a connection. This can happen if the user fails to provide the correct network URL, port number, or authentication credentials. Improper configuration can lead to Web3.js functions not working as expected.
  4. Smart Contract Issues: Web3.js is commonly used for interacting with smart contracts on the Ethereum network. However, if the deployed smart contract has bugs or errors, it can cause issues with Web3.js. For example, if the smart contract has incorrect function definitions, invalid input parameters, or insufficient gas limits, Web3.js may encounter errors or unexpected behavior when interacting with the contract.
  5. Insufficient Gas: Gas is the unit used to measure computational effort in Ethereum. When executing transactions or contract interactions using Web3.js, users need to specify an appropriate amount of gas to ensure the transaction is processed successfully. Insufficient gas limits can cause transactions to fail or smart contract interactions to be incomplete. Therefore, if users do not provide enough gas when utilizing Web3.js, it may not work as intended.

Hard skills of a Web3.js Developer

As a Web3.js Developer, having a strong set of hard skills is crucial to succeed in the rapidly evolving world of blockchain technology. Here is an overview of the hard skills required for different levels of expertise:


  • Proficiency in JavaScript: Strong knowledge of JavaScript programming language and its core concepts.
  • Web3.js Library: Familiarity with Web3.js library and its functionalities for interacting with Ethereum blockchain.
  • Smart Contracts: Understanding of smart contracts and the ability to write basic smart contracts using Solidity.
  • Ethereum: Knowledge of Ethereum blockchain and its ecosystem, including Ethereum Virtual Machine (EVM) and Ethereum Improvement Proposals (EIPs).
  • Front-end Development: Basic skills in HTML, CSS, and front-end frameworks like React or Angular for building user interfaces.


  • Ethereum Development: Extensive experience in developing decentralized applications (dApps) on the Ethereum blockchain.
  • Advanced Smart Contracts: Proficiency in writing complex smart contracts using Solidity, including contract inheritance, modifiers, and event handling.
  • Web3.js Integration: Deep understanding of Web3.js library and its integration with front-end frameworks.
  • DApp Testing: Knowledge of testing frameworks like Truffle and writing unit tests for smart contracts and dApps.
  • Blockchain Security: Familiarity with security considerations in blockchain development, including secure coding practices and smart contract auditing.
  • Version Control: Proficiency in using Git for version control and collaboration in a team environment.
  • Blockchain Protocols: Understanding of different blockchain protocols, consensus algorithms, and their implications on dApp development.


  • Blockchain Architecture: Ability to design and architect scalable and secure blockchain solutions.
  • Performance Optimization: Experience in optimizing smart contracts and dApps for gas efficiency and overall performance.
  • Decentralized Storage: Knowledge of decentralized storage solutions like IPFS for storing and retrieving data in dApps.
  • Web3.js Customization: Proficiency in extending and customizing Web3.js functionalities to meet specific project requirements.
  • Interoperability: Understanding of blockchain interoperability protocols like Polkadot and Cosmos for building cross-chain applications.
  • Security Auditing: Ability to conduct security audits of smart contracts and dApps to identify vulnerabilities and recommend mitigations.
  • Scalability Solutions: Familiarity with layer 2 scaling solutions like Plasma, State Channels, or Rollups.
  • Team Leadership: Experience in leading a team of developers and coordinating blockchain development projects.

Expert/Team Lead

  • Blockchain Governance: In-depth knowledge of blockchain governance models and frameworks.
  • Protocol Development: Ability to contribute to the development of blockchain protocols and standards.
  • Cross-disciplinary Skills: Proficiency in multiple programming languages, cryptographic concepts, and distributed systems.
  • Research and Innovation: Ability to stay updated with the latest advancements in blockchain technology and contribute to research and innovation in the field.
  • Smart Contract Security: Expertise in conducting comprehensive security audits of smart contracts and providing advanced security solutions.
  • Technical Strategy: Experience in defining technical strategies and roadmaps for blockchain projects.
  • Community Engagement: Strong presence in the blockchain community and active participation in events, conferences, and open-source projects.
  • Business Acumen: Understanding of the business implications of blockchain technology and ability to align technical solutions with business goals.
  • Project Management: Proficiency in project management methodologies and tools for overseeing blockchain development projects.
  • Collaboration and Communication: Excellent collaboration and communication skills to work effectively with cross-functional teams and stakeholders.
  • Mentoring and Coaching: Ability to mentor and coach junior developers, fostering their growth and development in blockchain technology.

Pros & cons of Web3.js

8 Pros of Web3.js

  • 1. Seamless Integration: Web3.js allows for seamless integration of blockchain functionality into web applications, making it easy to interact with smart contracts and decentralized applications (dApps).
  • 2. Wide Adoption: Web3.js is widely adopted and supported by major blockchain platforms such as Ethereum, ensuring compatibility and interoperability across different blockchain networks.
  • 3. Powerful Functionality: Web3.js provides a rich set of features and APIs that enable developers to build decentralized applications with advanced functionalities, including transaction handling, event listening, and contract deployment.
  • 4. Simplified Development: With Web3.js, developers can write code in familiar programming languages like JavaScript, making it accessible to a large community of web developers and reducing the learning curve.
  • 5. Secure Transactions: Web3.js ensures secure and reliable transactions by handling cryptographic operations and managing private keys, allowing users to interact with blockchain networks without compromising security.
  • 6. Community Support: Web3.js has a thriving community of developers who actively contribute to its development, provide support, and share resources, making it easier for developers to find help and stay updated with the latest advancements.
  • 7. Extensive Documentation: Web3.js offers comprehensive documentation and guides, making it easier for developers to understand its features, use cases, and best practices, thus accelerating the development process.
  • 8. Future-proofing: Web3.js is designed to evolve with the blockchain ecosystem, ensuring compatibility with future upgrades and improvements, which is crucial in an ever-changing technology landscape.

8 Cons of Web3.js

  • 1. Complexity: Utilizing Web3.js and interacting with blockchain networks can be complex, especially for developers who are new to blockchain technology. Understanding concepts such as gas fees, smart contracts, and decentralized networks may require additional learning.
  • 2. Performance Overhead: Interacting with blockchain networks through Web3.js can introduce performance overhead, as transactions need to be broadcasted, validated, and confirmed by the network, which can result in slower response times compared to traditional centralized systems.
  • 3. Limited Scalability: Web3.js relies on the underlying blockchain network’s scalability, which can be a limitation in terms of transaction throughput and network congestion during periods of high demand, leading to increased gas fees and slower transaction processing.
  • 4. Dependency on External Infrastructure: Web3.js relies on external infrastructure, such as Ethereum nodes, to interact with blockchain networks. This introduces a dependency on the availability and reliability of these nodes, which can impact the overall stability of the application.
  • 5. Security Risks: While Web3.js provides secure transaction handling, developers must still be cautious about potential security vulnerabilities, such as smart contract bugs or malicious third-party libraries, which can expose the application to risks such as hacking or unauthorized access.
  • 6. Lack of Standardization: As the blockchain ecosystem continues to evolve rapidly, there is a lack of standardization in terms of Web3.js APIs and functionalities across different blockchain networks. This can result in inconsistencies and compatibility issues when developing applications for multiple platforms.
  • 7. Learning Curve: Developing with Web3.js requires understanding the underlying blockchain concepts and technologies. This learning curve can be steep for developers who are not familiar with blockchain, cryptography, or decentralized systems.
  • 8. Limited Browser Support: Web3.js relies on browser support for certain functionalities, such as the MetaMask extension. While widely supported, there may still be limitations or compatibility issues with certain browsers or versions, potentially affecting the user experience.

TOP 10 Web3.js Related Technologies

  • JavaScript

    JavaScript is the backbone of web development, and it remains the go-to language for Web3.js software development. Its versatility and extensive ecosystem make it an excellent choice for building decentralized applications on the blockchain.

  • Web3.js

    Web3.js is a JavaScript library that provides a simple and intuitive way to interact with the Ethereum blockchain. It allows developers to create decentralized applications (dApps) that can communicate with smart contracts, send transactions, and retrieve blockchain data.

  • Solidity

    Solidity is a programming language specifically designed for writing smart contracts on the Ethereum platform. It is statically typed and supports inheritance, libraries, and complex user-defined types. Solidity is an essential tool for Web3.js developers as it enables the creation of secure and reliable smart contracts.

  • Truffle

    Truffle is a development framework that simplifies the process of building, testing, and deploying smart contracts. It provides a suite of tools and utilities that streamline the development workflow, making it easier for developers to create robust and efficient decentralized applications.

  • Ganache

    Ganache is a personal Ethereum blockchain that developers can use for local development and testing. It allows developers to simulate the behavior of the Ethereum network in a controlled environment, making it an invaluable tool for Web3.js software development.

  • IPFS

    IPFS (InterPlanetary File System) is a decentralized file storage and distribution protocol. It provides a peer-to-peer network for storing and retrieving files, making it an ideal companion for Web3.js development. With IPFS, developers can build applications that are resistant to censorship and have a distributed and resilient data storage system.

  • Metamask

    Metamask is a browser extension that acts as a wallet and allows users to interact with decentralized applications. It provides a secure and convenient way for users to manage their Ethereum accounts, sign transactions, and connect with Web3.js-powered applications.

TOP 14 Tech facts and history of creation and versions about Web3.js Development

  • Web3.js is a JavaScript library that allows developers to interact with the Ethereum blockchain. It was created in 2014 by Gavin Wood, a co-founder of Ethereum.
  • Web3.js is built on top of the Ethereum Virtual Machine (EVM), which enables the execution of smart contracts on the blockchain.
  • The library provides a wide range of functions and APIs for developers to interact with the Ethereum blockchain, such as creating and managing user accounts, sending and receiving transactions, and executing smart contracts.
  • Web3.js supports both synchronous and asynchronous interactions with the blockchain, allowing developers to build efficient and responsive decentralized applications (dApps).
  • Web3.js has gone through several major versions, with each version introducing new features and improvements. The latest stable version at the time of writing is Web3.js 1.5.0.
  • One of the groundbreaking features introduced in Web3.js is the ability to handle events emitted by smart contracts. This allows developers to react to changes on the blockchain in real-time.
  • Web3.js also provides support for the decentralized storage system IPFS (InterPlanetary File System), allowing developers to store and retrieve files in a distributed manner.
  • With Web3.js, developers can interact with various Ethereum-based networks, including the mainnet, testnets, and private networks, enabling them to build and test their applications in different environments.
  • Web3.js has a large and active community of developers who contribute to its development and provide support through forums, documentation, and online resources.
  • The library is open-source, which means developers can contribute to its development, customize it to their needs, and benefit from the contributions of the community.
  • Web3.js has become the de facto standard for Ethereum development, with many popular dApps and blockchain projects built using the library.
  • Web3.js has extensive documentation and a wide range of tutorials and examples, making it easier for developers to get started with Ethereum development.
  • Web3.js has been instrumental in the growth of decentralized finance (DeFi) applications, enabling the development of various financial services on the Ethereum blockchain.
  • The library is constantly evolving, with new features and improvements being added to meet the changing needs of the Ethereum ecosystem.

Soft skills of a Web3.js Developer

Soft skills are essential for a Web3.js Developer to effectively collaborate, communicate, and adapt in a dynamic and fast-paced environment.


  • 1. Communication: Ability to effectively communicate ideas and collaborate with team members.
  • 2. Problem-Solving: Aptitude for identifying and resolving issues in Web3.js development projects.
  • 3. Adaptability: Willingness to learn and adapt to new technologies and frameworks in the Web3 ecosystem.
  • 4. Time Management: Capability to prioritize tasks and meet deadlines in a timely manner.
  • 5. Attention to Detail: Strong attention to detail to ensure accuracy and quality in code implementation.


  • 1. Leadership: Ability to take ownership of projects and guide junior developers in the Web3.js domain.
  • 2. Collaboration: Proficiency in working collaboratively with cross-functional teams to achieve project goals.
  • 3. Analytical Thinking: Strong analytical skills to analyze complex problems and propose effective solutions.
  • 4. Initiative: Proactive approach in identifying opportunities for improvement and implementing them.
  • 5. Presentation Skills: Ability to effectively present and explain technical concepts to non-technical stakeholders.
  • 6. Teamwork: Capacity to work well within a team and contribute to a positive team dynamic.
  • 7. Flexibility: Adaptability to changing project requirements and priorities.


  • 1. Mentoring: Ability to mentor and guide junior and middle-level Web3.js Developers.
  • 2. Decision Making: Sound judgment and ability to make informed decisions under pressure.
  • 3. Client Management: Skill in managing client expectations and maintaining strong client relationships.
  • 4. Strategic Thinking: Capacity to think strategically and align Web3.js projects with organizational goals.
  • 5. Conflict Resolution: Proficiency in resolving conflicts and promoting a harmonious work environment.
  • 6. Stakeholder Management: Ability to effectively manage and communicate with various project stakeholders.
  • 7. Innovation: Aptitude for exploring new technologies and proposing innovative solutions.
  • 8. Resource Management: Efficiently manage resources, budgets, and timelines for Web3.js projects.

Expert/Team Lead

  • 1. Project Management: Strong project management skills to lead and deliver complex Web3.js projects.
  • 2. Strategic Leadership: Ability to provide strategic direction and lead a team of Web3.js Developers.
  • 3. Business Acumen: Understanding of business objectives and ability to align Web3.js projects accordingly.
  • 4. Negotiation Skills: Proficiency in negotiating contracts, timelines, and resources with clients and stakeholders.
  • 5. Innovation Leadership: Capacity to drive innovation and inspire the team to explore new possibilities.
  • 6. Decision-Making Authority: Ability to make critical decisions and take responsibility for project outcomes.
  • 7. Risk Management: Skill in identifying and mitigating risks associated with Web3.js development.
  • 8. Communication Strategy: Ability to develop and execute effective communication strategies for Web3.js projects.
  • 9. Team Management: Proficiency in managing and motivating a team of Web3.js Developers.
  • 10. Industry Knowledge: In-depth knowledge of the Web3 ecosystem and emerging trends in the field.
  • 11. Continuous Learning: Commitment to continuous learning and staying updated with the latest developments in Web3.js.

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