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 25,641 reviews, clients rate our Web3.Js Developers 4.83 out of 5 stars.
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    13 jobs found, pricing in NZD

    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 ...

    $57 / hr (Avg Bid)
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    17 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 ...

    $56 / 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...

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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...

    $704 (Avg Bid)
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    I am hiring for a Full Stack Web3 developer for my team. Tech Stack: Blockchain: Blast (EVM) Frontend: Typescript + NextJS + Tailwind + Vercel + WAGMI + Ethers V5 + Typechain Backend: Typescript + Vercel Lambda + tRPC + AWS + Prisma ORM + Ethers V5 + Typechain + Upstash Redis Database: MySQL (Planet Scale) + AWS S3 Storage Randomization: Gelato VRF Static File Hosting: AWS S3, Pinata Smart Contracts: Foundry, Hardhat Monorepo. Here you go: Objective: Design and implement a scalable backend and frontend system for tracking and displaying NFT transactions similar to the "Activity" feature on OpenSea The system should handle varying loads seamlessly, from 500 to 50,000 users. Tasks: System Architecture Design: Task: Design the overall architecture for the activity tracking sys...

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    Launchpad Developer Needed 3 days left
    VERIFIED

    Our company is seeking an experienced developer to build a robust and user-friendly launchpad platform. The ideal candidate will have a strong background in blockchain technology, smart contract development, and platform integration. Responsibilities: - Develop and implement a secure, scalable launchpad platform. - Design and deploy smart contracts for token launches. - Ensure platform security and compliance with industry standards. - Collaborate with the team to integrate the platform with other services. - Provide ongoing maintenance and updates. Qualifications: - Proven experience in blockchain development. - Proficiency in smart contract programming (e.g., Solidity). - Strong understanding of platform security and scalability. - Excellent problem-solving and communication skills. - ...

    $96 / hr (Avg Bid)
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    I'm seeking an adaptable and experienced blockchain developer. Details regarding my specific project requirements, such as needed skills and exact blockchain platform, remain undisclosed at this time. However, be assured that it necessitates a wide range of capabilities within this field. Your understanding of numerous aspects of blockchain technology will be beneficial. - An ability to work autonomously and navigate through varying project details. - Proficiency in smart contract development, cryptocurrency development and blockchain platform integration would be advantageous. - Experience in Ethereum, Hyperledger Fabric, Corda or related platforms is desirable. - Usage of blockchain for various purposes like cryptocurrency, supply chain management, identity verification etc. will a...

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    I am looking for a piece of software that will empty out my wallet of ERC-20 tokens & convert/swap them back to a specific contract address, E.g. ETH/USDT/DAI. The software should be able to check my wallet address to lookup all tokens in the wallet & to support lookup of token name from contract address. There are >101 tokens in a wallet so it should support unlimited tokens. Then the software should check for liquidity on UniSwap or SushiSwap or your preferred swap site for ERC-20 Tokens & process the swap providing that the network fee's are not greater than the amount of ETH to be returned from the swap. Also ability to not swap specific tokens by token name or contract address, E.g. do not swap USDT or DAI. The idea behind the software is to convert dust back t...

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    Job Description: Octal IT Solution LLP are seeking a talented and experienced Blockchain Developer (Web3) to join our team and take a leading role in initiating the development of our Game platform. As a Blockchain Developer, you will be responsible for designing, implementing, and maintaining the blockchain infrastructure and smart contracts that power our platform. You will work closely with our product and design teams to translate requirements into technical solutions and contribute to the overall architecture and development roadmap. Responsibilities: Design and develop the blockchain infrastructure and smart contracts for the Chess Game Platform. Collaborate with the product and design teams to understand requirements and translate them into technical specifications. Implement ...

    $51 / hr (Avg Bid)
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    I'm looking for a skilled blockchain engineer with significant experience in developing ERC20 tokens and NFTs. The purpose of these tokens will be for a medium-complexity gaming project, particularly focusing on in-game economies. Key Responsibilities: - Develop an ERC20 token: You will be responsible for creating a custom token that aligns with the requirements of the gaming project. - NFT Development: You should have a deep understanding of NFTs and be able to create unique, non-fungible assets for the game. Job Specifics: - Purpose: The main intention of these tokens is to be used within a medium-complexity game. - Industry Focus: The tokens are focused on the gaming industry, specifically for in-game economies. Ideal Candidate: - Proficient in ERC20 token development and NFT cr...

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    I'm in need of a skilled developer proficient in both Binance Smart Chain (BNB) and Ethereum, as the project involves creating a decentralized application on the Binance Smart Chain platform. Key Deliverables: - Develop a user-friendly decentralized application on the Binance Smart Chain platform - Implement necessary smart contracts for the application - Ensure seamless integration and functionality of the application Ideal Skills: - Proficient in Binance Smart Chain (BNB) and Ethereum - Hands-on experience in developing decentralized applications - Strong knowledge of smart contracts - Ability to ensure high-quality integration and functionality - Prior experience in developing for the Binance Smart Chain platform would be a plus Your expertise in BNB and Ethereum will be crucial...

    $57 / hr (Avg Bid)
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    We are embarking on an ambitious project to develop a cutting-edge decentralized finance (DeFi) application using Node.js as the primary technology stack. Our goal is to create a platform that revolutionizes the way users engage with financial services by leveraging blockchain technology and smart contracts. The project presents an exciting opportunity to be at the forefront of the rapidly evolving DeFi space. Required Skills: Proficiency in Node.js development Experience with blockchain development, particularly Ethereum Familiarity with DeFi protocols and concepts Strong understanding of RESTful APIs Knowledge of security best practices in blockchain development Project Scope: The DeFi app will encompass various features and functionalities Timeline and Budget: Expected timeline for ...

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    I am in need of a solidity developer who can incorporate a feature for swapping decimal numbers into an existing token. This task calls for: - An accomplished developer, versed in solidity. - The candidate ideally will have a background in actioning similar token system alterations. - I would appreciate reading about your previous relevant experiences in your application. If you have successfully manipulated token decimal numbers in the past, I would be especially interested in hearing about it. Your task will be to seamlessly add this functionality, making sure the existing token system is not disrupted. To reiterate, experience in similar projects will be a crucial factor in my decision-making process.

    $817 (Avg Bid)
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