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 21,025 reviews, clients rate our Web3.Js Developers 4.81 out of 5 stars.
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    I'm actively seeking an expert blockchain developer to create a fork of PancakeSwap V3 for the MANTA network. Here are the specifics: • The fork should have similar functionality to PancakeSwap V3, including but not limited to: - Liquidity pools - An automated market-making (AMM) algorithm - Yield farming capabilities • In addition to the standard functionalities, the fork needs to implement some enhanced security measures including: - Two-factor authentication - Timelock functions - Anti-front-running measures Not just replicating, it's also crucial to be able to adapt the platform to manta chain, which will require programming skills beyond copying and pasting code. I'm specifically interested in a developer who has previously worked with Sol...

    $1552 (Avg Bid)
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    3 bids
    Staking pool with fix yield 6 days left
    VERIFIED

    NEEDED: Staking pool for existing NFT marketplace on EVM chain Looking for a web3 dev to build a staking pool and implement into the existing NFT marketplace architecture. Several functions of existing modules can be re-used, but it would be necessary to create a new separate smart contract, context file and front-end of the staking pool. Staking mechanism: The token distribution should have a total fix amount (e.g. 1M tokens per month to all participants in total during 1 year) and proportionally given to its participants. Each participant should have the option to "Add Stake", "Remove Stake", "Compound" and "Withdraw Yield".

    $179 (Avg Bid)
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    12 bids

    I need a simple tg bot to input a wallet address and calculates the PnL of the last X trades. The result should be shown in a simple table with Coin name, Amount invested, Amount returned, PnL and link to relevant transactions I will share a example image of the result with the candidates.

    $52 (Avg Bid)
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    I'm in need of a professional Solidity developer who is familiar with smart contract development. This project revolves around the development of custom contracts with a specific focus on investment-related functions. Key Features To Implement: - Investment functionalities Required Skills and Experience: 1. Proven Solidity experience, preferably with distinction in smart contracts. 2. Prior experience with custom contracts and knowledge of financial transactions in smart contracts. 3. Familiarity with blockchain integration and Decentralized application (DApp) development. 4. Ideally should have experience in implementing investment functionalities in contracts, though it's not strictly necessary. Please bid if you are confident about your expertise in Solidity and smart cont...

    $203 (Avg Bid)
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    I'm aiming to fortify election security using an Ethereum-based voting system with facial recognition. This tool will be available to the general public; anyone should be able to use it. I am specifically interested in: - Facial recognition: This feature should accurately authenticate voter identities to minimize any potential electoral fraud. - Encrypted and transparent voting process: Every vote cast should be encrypted for security reasons and there needs to be transparency in the voting process to reinforce trust in the system. - Real-time results tracking: I want a feature that allows everyone to monitor election results in real time. This can help keep the situation transparent and everyone informed. Ideal candidates for this project would be acquainted with Ethereum, smart...

    $132 (Avg Bid)
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    I attached a screenshot that shows the problem. It shows runtimes error. and it shows some problems when connect wallet. candidate should solve that problem. it is an urgent thing, so I need to start it immediately. Requirement Skills and Experience - Proficient in ReactJS with a strong understanding of its core principles. - Experienced in debugging and error handling within React applications. - Experienced in Web3 for connect wallet - Bonus for Blockchain Detailed attention and a fast turnaround. Thank you

    $529 (Avg Bid)
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    113 bids

    Needs to be a simple yet nice looking interface (responsive). User will login with metamask and as the first token will be a very simple version with no taxes etc, the user will enter supply, name, symbol and decimals and will charge a small fee that will go to admin wallet and will deploy to the blockchain and send all tokens to owner/deployer. Need this to pass audits, owner cannot mint, cant make fees, all totally secure. Owner can renounce. The app/dapp will allow my address as admin to mint tokens without fee. The app/dapp will be able to create and deploy tokens on BSC and ETH. *This is version 1. We will include many other kinds of tokens onto the app after initial release.

    $394 (Avg Bid)
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    I need an AI chatbot with a free standard version and I pro version that will be free with web3 access to holders of the projects website. Will be a lot better visually and more modern that chatgpt and be responsive. Will have additional features such as initiating names for chats before user starts a new chat and/or changing the chat name after at any point. Can save/share documents generated within the chat in certain formats such as txt,pdf,csv. Can generate images and/or videos based on prompts. Can use voice to enter chat and the aibot can reply back in voice (user should be able to choose the voice from a selection) so the app can be like an AI Siri. Want it to have less limitations as chatgpt.

    $806 (Avg Bid)
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    56 bids

    I'm in need of expertise to resolve a recurring error in my current platform built with Flutter. The error message is "insufficient fund from gas * price + +value” and it is incredibly disruptive to the operation of the platform. I've verified I have enough gas balance in my wallet to cover the transaction. My application is utilizing an outdated version of the web3dart Flutter library. It's necessary for the freelancer to have experience working with the older versions of this library. The ideal candidate would have: - Proficient knowledge of Flutter - Extensive experience with the web3dart Flutter library - Proven track record in resolving similar bugs - Comfortable working with outdated system libraries Your task will be to: - Analyze the system and error - ...

    $29 (Avg Bid)
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    14 bids

    I'm in need of a skilled smart contract developer who's especially proficient in Solidity and JavaScript for a betting platform. Our application requires to fork OvertimeMarkets and adapt it to create our own betting platform. Features to be implemented are: - Smart contract with Solidity - Payment token should be PAALAI token - Deploy smart contracts to Sepolia testnet and write testcase using Hardhat or Truffle Experience and Skills Needed: - Proficiency in Solidity and is a must - Proven experience in blockchain integration, preferably in DApp projects - A strong understanding and prior work history of integrating payment systems. If you have example projects which are similar with this, please provide them.

    $624 (Avg Bid)
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    30 bids

    I'm looking for a proficient developer who is familiar with Solana & Raydium. All your task is preferred to using python, and here is the task with detailed: Assuming now i'm creating a solana token (SPL) and want it tradable on Raydium, for your scripts, i could use it to: a) Add liquidity; b) Remove liquidity; c) Monitor my liquidity pool in a real time; d) I could choose remove the liquidity automatically when the pool reached a certain amount. e) Bouns task: when add liquidity by raydium ui, it would apply for a amm account & its id for each new token. all this process would take about 0.68 sol. if you could try to reduce the cost, then you're welcome to asked for a bonus payment. We do expect you are familiar with Solana, Raydium DEX, and blockchain.

    $216 (Avg Bid)
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    13 bids

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