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.

Från 21,834 betyg, betygsätter kunder vår Web3.Js Developers 4.81 av 5 stjärnor.
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    11 jobb har hittats, med prissättning USD

    I want sustem do 1-user connect wallet with useWallet 2-send 10 slt oken from the token address 3-money ended after confirm transaction with wallet to admin address use react and this versions "@solana/spl-token": "^0.2.0", "@solana/wallet-adapter-base": "^0.9.23", "@solana/wallet-adapter-react": "^0.15.35", "@solana/wallet-adapter-react-ui": "^0.9.35", "@solana/wallet-adapter-wallets": "^0.19.32", "@solana/": "^1.33.0", need this mall task today

    $40 (Avg Bid)
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    Need an online marketplace site where users can offer services or users can post services wanted. Users can contact gig owner before ordering but will have measures in place to avoid spam and to make sure they aren't trying to contact out of the site. Will need to place banner ads and have an option for responsiveness so the ads show in mobile devices as well or a second option for mobile ads. The buyer or winner of the gig will have a meeting with a specified maximum time as decided by the gig creator. The meeting will be online via video chat (which will need to be incorporated) or meet in person (location must be specified). All payments will be via crypto and admin getting a % of each order. Site will have a referral program which will be in the member panel with unique links...

    $365 (Avg Bid)
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    I currently have a working script using the 0x protocol. I frequently get out of gas error messages. I could have 50$ or 3$of ETH in my wallet when this happens so it is not a lack of funds. I believe this is an issue with the script not allocating enough gas. Here is an example of 2 of the TX that failed on Tenderly I need the following: 1. I need someone to fix the OUT of GAS ISSUE AND use the highest amount of GWEI so the TX is processed as fast as possible. 2. ON one of the last lines, the amount of GAS is output. I would like to out ut the TX fee in ETH if possible. PLEASE, I am looking for someone who is skilled in Blockchain This will be quick fix for that person and shouldnt cost alot..... Ideal Candidate Skills and Experience: - Significant expertise in blockc...

    $293 (Avg Bid)
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    As I venture into the cryptocurrency market, I am in need of a Node.js script that allows efficient Solana trades using the Jup V6 API. Key Requirements: - Build a Node.js script that can accurately execute market orders. - Indispensable ability to interact with the Jup V6 API specific to Solana token transactions. - Configure the script to be used with an existing wallet address of mine. Ideal freelancers for this project would have: - Strong proficiency in Node.js, ideally with prior experience in building scripts for cryptocurrency trades. - Familiarity with the Jup V6 API and its various functionalities, especially in relation to market orders. - Solid understanding of the Solana cryptocurrency token. By helping me to automate my Solana trading activities, you'...

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    I'm in need of a skilled developer with specific expertise in blockchain and wallet integration. The project involves building an ICO presale website on the Polygon blockchain. All the necessary content and Figma designs are already prepared; your primary focus will be on integrating the presale contract and MetaMask wallet, as well as implementing a few key features in the contract. here is the design of the website Key Requirements: - Deploy a presale contract on the Polygon blockchain - Implementing a locking mechanism in the contract - Ensuring that tokens are sent only after the presale ends - Make sure only virtual balances are visible; actual tokens are not sent Ideal Skills: - Extensive experience in blockchain development - Proficient in working with the Polygon blockch...

    $596 (Avg Bid)
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    I am in search of a skilled web3 developer to assist in the ongoing development of a decentralized finance (DeFi) project on the Ethereum blockchain. The project is currently in progress, and the ideal candidate will have a solid understanding and experience in Ethereum, EVM, and Dex technologies. The original developer has gone on a trip, and we're seeking someone to continue the project. So, we want to prioritize completing the graphs and tables on our platform till he arrives. It's just the UI aspect, but it's linked to Web3, so we're looking for a Web3 developer. Key skills and experiences that are preferred for the job include: - Proficiency in Ethereum and Solidity - Experience in developing DeFi projects - Familiarity with EVM and Dex - Understanding of th...

    $36 / hr (Avg Bid)
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    I'm seeking an experienced developer to build a blockchain launchpad with web3 integration. This project's focus is more on functionality than aesthetics, and you will primarily need to integrate a smart contract into our existing frontend. The essential requirements for this project are as follows: - Ability to integrate smart contracts with a frontend application. - Proficiency in working with Base Sepolia Test Net. - Familiarity with web3 blockchain development. Though not necessary, any prior experience in building launchpads or similar projects would be a significant plus. This task requires in-depth knowledge of blockchain development, so I expect all interested freelancers to have a strong background in this space.

    $81 (Avg Bid)
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    We would like to create a Dune Dashboard for a token project, with the following data, which is all onchain. Keep in mind that the token is on four different chains: Ethereum, Solana, BNB, and BASE): -price -total market cap -total number of token holders -line chart of total number of token holders over time -number of holders on each chain (as pie chart) -total 24h volume -24h volume on each chain (as pie chart) -total 24h token revenue (this is simply 1% of total volume on Ethereum) -total amount of donations made by project (all onchain) -total number of NFTs owned by DAO (they are all in a single address) -Price of X at the market cap of Y for three tokens (this will show what the price of the token would be if it had the current market cap of three different tokens) Looking for som...

    $39 / hr (Avg Bid)
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    28 bud
    Need to complete project 1 dag left
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    I have a pre-sale project. Staking, pooling, and governance must be completed. It is not yet complete and has not been deployed to servers. If you have good experience, please check the project and let me know the budget and time to complete the project. Share the repository. And I would like to hear your advice to complete the project successfully. I want to finish it within 3 months. Requirements Technologies: Frontend, Blockchain, Web3, Backend, Database, Solidity, API Integration. thank you

    $23 / hr (Avg Bid)
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    I am looking for someone who can upgrade walletconnect library to latest version. Just need to upgrade Library

    $35 (Avg Bid)
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    I'm seeking an expert in Web3 and Solidity to lead me through practical exercises in Smart contract development, Decentralized applications (dApps), and Blockchain integration. The ideal candidate must be: - Proficient in Solidity and Web3 with a strong background in the deployment of smart contracts and dApps. - Capable of explaining complex concepts in an understandable way, and guiding through practical exercises, and have patience. - Experienced in real-world projects that demonstrate the successful application of blockchain technology. Given my basic knowledge in the field, I'm looking for a tutor who can help me further develop my skills through hands-on experience by guiding me through building a smart contract using 'ThirdWeb' SDK platform. I'm exc...

    $34 / hr (Avg Bid)
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    89 bud

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