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 21,700 reviews, clients rate our Web3.Js Developers 4.83 out of 5 stars.
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    We are seeking a skilled Frontend Developer to integrate a staking smart contract with a React frontend page for interaction. The project involves combining a pre-existing staking smart contract, staking React page, and token contract to create a seamless user experience. The necessary components including the staking contract, staking react page and token contract have already been prepared. Initially, we will conduct trials on the Sepolia testnet or other testnet to ensure all systems are operational before launching on the Ethereum mainnet. I have already source code for UI. If you're a skilled Frontend Developer with a passion for blockchain and smart contracts, please submit your resume and a brief cover letter explaining your experience and qualifications for the position. We ...

    ₹199983 (Avg Bid)
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    38 bids

    I'm looking for a developer fluent in Solana blockchain technology with a focus on building a token swapping functionality for the Raydium Swap. Key Responsibilities: - Design and implement a seamless token swapping feature - Integrate the token swapping functionality with Solana blockchain - Ensure the functionality is secure and user-friendly Ideal Skills and Experience: - Proficient in Solana blockchain development - Proven experience in token swapping development - Familiarity with creating secure, efficient, and user-friendly features - Strong problem-solving skills and attention to detail The successful candidate will primarily be responsible for enabling users to swap tokens effectively using the Raydium Swap. This will involve integrating the functionality with the Solana b...

    ₹9725 (Avg Bid)
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    27 bids

    Blockchain development DAO plus mime coin and web3 game development required plus additional elements.

    ₹2577 / hr (Avg Bid)
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    45 bids

    I have a developer creating a membership site for me and I need a crypto payment solution. I want to accept 2 crypto tokens 1 will be at a cheaper rate than the other and will be a monthly payment but need a lifetime member option which will be at a higher rate. I just need something created where they can easily pay with crypto and after successful payment it will return to member area. Both tokens will be on bsc the first will be USDT and the second will be my projects token.

    ₹19865 (Avg Bid)
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    12 months ago I launched a token and after a moderate presale it failed when it went to market and is dead now. Seeing that the coin is dead I wish to unlock my liquidity which is still locked until a few days time with pinklock but I don't know how to access it. I will give all details before hiring so you can check and confirm the amount and will hire winner to help me retrieve the liquidity.

    ₹10722 (Avg Bid)
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    28 bids

    I'm seeking a skilled blockchain developer with expertise in Solidity programming and Ethereum Virtual Machine (EVM) for the development of a decentralized application (dApp) with DeFi functionalities. We want to build this: With some changes: - colors, branding - different EVM blockchain (Base) I have the codebase, and the contract. What I need is: - for you to modify codebase for new contract, and new design. - host it (on Netlify, or something similiar if you think it is better). Or explain me how to host it. - assist me with testing on testnet.

    ₹4239 / hr (Avg Bid)
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    70 bids
    Dextool/ Dexscreener Clone 4 days left
    VERIFIED

    I'm looking for a skilled developer to create a Defi similar to Dextool/Dexscreener. The project will require a comprehensive understanding of cryptocurrency markets, and the ability to create a robust tracking and information system. Ideal skills and experience for this project include: - Proficiency with real-time data integration - Extensive experience with cryptocurrency-related projects - Strong analytical and problem-solving skills - Familiarity with blockchain technologies - The ability to design and develop user-friendly interfaces I need a clone of Dexscreener for the BASE chain. a. We need to pull data from various AMMs like UniSwap, base swap, Alien Base, PCS b. Display those data in our design which is pretty much similar to Dexscreener c. Dex supports many Blockch...

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    Trophy icon Tron Smart Contract Developer 2 days left

    We are looking for a skilled Tron developer to join our team and help develop a smart contract for a wallet application. The ideal candidate should have experience with Tron blockchain development and be familiar with BIP 39 or BIP 44 for address generation. Responsibilities: 1) Develop a smart contract on the Tron blockchain for a wallet application. 2) Implement functionality for address generation using BIP 39 or BIP 44. 3) Ensure that fees for all wallet transactions, including sending TRX or any ERC10 or ERC20 tokens, are deducted from a specified multiple accounts assigned in the smart contract, and not from user. 4) Also user need to pay the fees to the contract as an escrow, i.e. user will not pay the transaction fee, the transaction fee will be paid by the assigned accounts in ...

    ₹83119 (Avg Bid)
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    9 entries

    I'm in need of a skilled web developer to create a web3 crypto sports betting website for me. The site should have the following features: - User registration and login system - Real-time odds for different sports like Football, Basketball, Tennis, and Cricket - Support for multiple cryptocurrencies for betting Additionally, I'd like the site to have the functionality to: - Offer a cash-out option - Seamlessly integrate with social media platforms Ideal candidate should have experience in developing betting websites, be knowledgeable in web3 and cryptocurrency integration, and have a good understanding of the sports betting world. Your design should be user-friendly and secure. Looking forward to your bids.

    ₹53193 (Avg Bid)
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    I'm looking for a skilled developer to help me create a sniper bot that operates on Raydium and leverages the Solana blockchain. Key Requirements: - Operation on the Raydium exchange: The bot should be able to execute trades on this specific exchange efficiently. - Criteria for trading: The bot should have the capability to identify and act upon specific criteria including buy/sell thresholds, liquidity pool monitoring and slippage tolerance. These criteria will be provided to the developer in detail. - Frequency: I want the bot to scan and execute trades on Raydium every 10 seconds. The ideal freelancer for this project should have experience in developing trading bots, particularly on the Solana blockchain. Additionally, experience with Raydium and the specific criteria I&#...

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    I have a Uniswap Swap Widget integrated on my web platform built using React. The widget is currently facing connectivity problems that need to be addressed. Uniswap Swap Widget It use Metamask and Wallet Connect , I want change it Rainbowkit connector It need to complete in few hrs Ideal Skills and Experience: - Proficiency with React and Uniswap - Experience in fixing connectivity issues in web platforms - Understanding of how to integrate and troubleshoot widgets The task mainly involves identifying the root cause of the connectivity issue, and implementing a reliable fix that ensures the widget functions correctly. Experience with similar projects or Uniswap integration will be a strong plus.

    ₹7813 (Avg Bid)
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    13 bids

    We are seeking a skilled Frontend Developer to integrate a staking smart contract with a React frontend page for interaction. The project involves combining a pre-existing staking smart contract, staking React page, and token contract to create a seamless user experience. The necessary components including the staking contract, staking react page and token contract have already been prepared. Initially, we will conduct trials on the Sepolia testnet or other testnet to ensure all systems are operational before launching on the Ethereum mainnet. I have already source code for UI. If you're a skilled Frontend Developer with a passion for blockchain and smart contracts, please submit your resume and a brief cover letter explaining your experience and qualifications for the position. We ...

    ₹2992 / hr (Avg Bid)
    ₹2992 / hr Avg Bid
    21 bids

    We are seeking a skilled Frontend Developer to integrate a staking smart contract with a React frontend page for interaction. The project involves combining a pre-existing staking smart contract, staking React page, and token contract to create a seamless user experience. The necessary components including the staking contract, staking react page and token contract have already been prepared. Initially, we will conduct trials on the Sepolia testnet or other testnet to ensure all systems are operational before launching on the Ethereum mainnet. I have already source code for UI. If you're a skilled Frontend Developer with a passion for blockchain and smart contracts, please submit your resume and a brief cover letter explaining your experience and qualifications for the position. We ...

    ₹2909 / hr (Avg Bid)
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    I'm looking for a Web3 developer with experience building decentralized applications (DApps) on the Polygon network, specifically the NFT marketplace. work: - Implement smart contract functionality required for NFTs on the Polygon network. - Smart contract development - Developed transaction distribution server on polygon mainnet using Web3 API - Implement smart contract functionality required for NFTs on the Polygon network. Ideal skills and experience: - Proficient in web3 technologies with a focus on Polygon. - Proven experience in developing decentralized applications (DApps), especially NFT marketplaces. - Good understanding of security measures and best practices in the blockchain space. - Ability to create attractive and engaging user interfaces. - Strong problem...

    ₹205054 (Avg Bid)
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    I'm looking for a skilled developer to create a fun and engaging website for my meme token. The website will be a PARODY of a popular Adult website. NO PORN, JUST FUNNY VIDEOS. Key Features: ** Refer ** - Require all functionalities as but with the theme of pornhub website. - Videos will be hosted on youtube with link to our website as per sample. - Other then mainpage with videos there will be 3-4 other pages with general meme token information like tokennomics, Presale (no web3- just a page), Socials, dexscreener chart, Contact us etc. - Require ability for admin to upload videos from time to time. - Ideally use a tech stack like react.js ,node.js so that future web3 developments can be incorporated. Ideal Freelancer: - Proficient in web development, particularly in creating e...

    ₹35741 (Avg Bid)
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    79 bids

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