Web3.js is an open source software library that helps integrate with decentralized applications built on Ethereum blockchain technologies. As Ethereum is built on blockchain, Web3.js works as a bridge between the Ethereum blockchain and its users without transcending any rules or data from the blockchain network.

A Web3.Js Developer is an experienced programmer for building decentralized applications using Ethereum development framework and the Javascript library, Web3. When developers use Web3.js, they can craft secure and reliable applications upon a wide-scale peer-to-peer blockchain network with the help of a trustless system of data storage and transfer.

Here are some projects that our expert Web3.Js Developers made real:

  • Creating user authentication features on existing web apps
  • Setting up marketplaces for NFTs
  • Integrating ETH payment systems with React dApps
  • Connecting web sites to TikTok pages
  • Crafting smart contracts on Ethereum technology
  • Writing Typescript & React code
  • Auditing smart contracts prior to deployment

It's projects like these that show the full potential of what a Web3.Js Developer can do for your project. With their knowledge of web development and proprietary scripting language, our experienced developers were able to craft advanced yet secure applications for clients that created real value for all parties involved. With this in mind, we invite you to post your own project and set out to hire a remarkable development team with Freelancer.com today.

From 26,232 reviews, clients rate our Web3.Js Developers 4.85 out of 5 stars.
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    I'm looking for an experienced developer who can help me create a secure decentralized wallet application with a swap function on the Android platform. Key Requirements: - The main focus should be on security. - A smooth and intuitive user interface design is a must. - The app should also ensure a fast and seamless transaction speed. Ideal Skills and Experience: - Proficiency in Android app development. - Prior experience with decentralized applications is highly preferred. - A strong understanding of cryptocurrency transactions and wallet security is a huge advantage. - A track record of developing high-quality, user-friendly apps. In your proposal, please highlight your relevant experience creating similar applications, particularly in the blockchain or financial t...

    $1741 (Avg Bid)
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    Web3 React developer 6 days left

    Summary: We are seeking a talented and experienced Web3 React Developer to join our dynamic team at MahaDAO on a 2 month contract basis. The ideal candidate will have a strong background in front-end development using React.js and a deep understanding of blockchain technologies and decentralized applications (dApps). You will be responsible for designing, developing, and maintaining cutting-edge Web3 applications that provide seamless user experiences and leverage the power of blockchain. Company Overview: MahaDAO is on a mission to create a decentralised and stable economy. Our community envisions a shared passion for creating a decentralised economy with an emphasis on marching toward financial liberty together. Visit to know more. Key Responsibilities: - Develop and maintain Web3 ap...

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    We are currently seeking a skilled and experienced Web3 Frontend Developer to join our team and work on an exciting project to build a blockchain DeFi app. The tech stacks for this project include JavaScript, TypeScript, and Solidity. Our objective is to develop an application that exceeds the functionality and user experience offered by the website If you are interested, please apply to your relavent experiences. Thank you

    $71 / hr (Avg Bid)
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    I'm in need of an AI trading bot that can operate across multiple markets such as Cryptocurrency, Forex, and the Stock Market. Ideal Features: - Real-time Market Analysis: The bot should be able to analyze market conditions and adjust trading strategies accordingly. - Portfolio Management: It should be able to efficiently manage multiple trades and portfolios. - Risk Management: The bot needs to have a robust risk management system in place to ensure trading is done within predefined risk levels. Market Analysis: Continuous monitoring and analysis of multiple cryptocurrency exchanges and stock markets. AI Algorithm Development: Creation of sophisticated algorithms using machine learning and neural networks. Real-time Data Integration: Integration with APIs from various exchanges to...

    $10863 (Avg Bid)
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    I need a simple crypto site with similar functions as mixed with however will have an interface that looks more like It will be responsive and connect with solana blockchain via web3. It will have function to schedule launch for up to 2 weeks and I as admin should be able to add a kyc badge to the listing to show that the developer has KYC. ZERO Transaction fees and each buy order will be viewed as a trade rather than a contribution. The market cap will go up with each buy order. Will have the additional feature to add a youtube link to listing so video appears. Developers can also link streaming accounts and a lite/sign will appear when dev is streaming. Will also have top 12 trending list on top of page. Developers and users will have there own profile as with by loging in with...

    $1224 (Avg Bid)
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    Frontend and Web3 Dev Needed 3 days left

    I'm seeking developers who are proficient in frontend development, as well as have experience with Web3. The primary goal of this project is to enhance the functionality of a web application by integrating Web3 capabilities. Ideal Skills and Experience: - Proficient in frontend development - Experience with Web3 development - Strong command over JavaScript, HTML/CSS, and Solidity The project is to build a decentralized application by integrating Web3 functionality. Your role will include fine-grained frontend development, as well as implementing the necessary elements for the Web3 integration.

    $27 / hr (Avg Bid)
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    I need a proficient blockchain developer to create wallet integrations for both ERC20 and SPL (Solana Program Library) tokens. Key Requirements: Create a backend that - [ ] For every user registers an EVM address and a SPL address so that all deposits can be captured in the backend - [ ] Write a cron job that detects deposits for a user and tracks it - [ ] Write a cron job that sweeps deposits into a hot wallet - [ ] Write logic that continously sends all deposits after a certain threshold to a multisig wallet - [ ] Write a cron job that processes all withdrawals - [ ] Write logic to prepare a refund transaction from the multisig wallet if the hot wallet is empty Timeframe: The project needs to be completed within a month. Ideal Candidate: - Proficient in blockchain technology....

    $1658 (Avg Bid)
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    Summary- We have a codebase of a lending protocol written in Move and would like to integrate our frontend with this lending code. The site will be hosted on it’s domain so there is full freedom on the changes made to the site and no need for any backwards compatibility for the site. The MOVE codebase is written by Aave: This codebase is written in Move and can be used as a reference only to build the project. We would like to take most of the code from here. The front end is currently a web3 (EVM-based) dApp. Access can be shared via Github. Requirement- Following functionalities we would like to get integrated - [ ] Wallet Integration - Allow users to connect their move wallet to the site - [ ] Balance Integration - Allow users to see their balances - [ ] Supply, Borrow,...

    $5758 (Avg Bid)
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    I have a casino game that update the payment gateway. I need to integrate crypto wallet and to manage the payment with crypto. Metamask, Trustwallet, Phantom, TRONwallet and etc Requirement: - Build frontend for wallet connection modal - Crypto wallet connection - Build smart contract for payment - API integration I can share the development version for checking project and will provide final version to candidate. After checking dev version, candidate can provide the estimationf for completing project and we can discuss more details. Please share experience for similar job. Good luck.

    $33 / hr (Avg Bid)
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