Ethereum is an open-source distributed blockchain network that enables its users to create smart contracts, build and deploy decentralized applications (DApps) securely, and maintain a digital ledger of transactions without the need for a third-party mediator. An Ethereum Developer is a professional that has a strong understanding of blockchain technology and the necessary programming skills to create smart contracts, develop decentralized applications (DApp), implement crypto wallets and payment systems, and secure associated networks.

Here's some projects that our expert Ethereum Developers made real:

  • Created user authentication and 3rd-party verification systems for web applications
  • Developed secure payment systems and crypto wallets
  • Implemented blockchain-based trading networks
  • Developed smart contracts and token minting protocols
  • Created decentralized registries with publicly viewable records
  • Built bots to purchase tokens within the Ethereum or Binance blockchains

The Ethereum blockchain not only provides the tools for increased security measures but also provides tamper-proof smart contract functionality through which its users can directly interact with each other without the need for intermediaries. Our expert Ethereum Developers have years of experience in creating blockchain solutions for individuals, startups, and established companies. All of Freelancer.com’s vetted Ethereum Developers possess the necessary tech expertise to make any idea into a reality.

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    21 jobs found, pricing in 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

    $36 (Avg Bid)
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    I'm seeking an experienced blockchain developer to create an Ethereum based ERC-20 token, with unique features of a private pre-sale and a vesting period. Key Responsibilities: - Develop an Ethereum ERC-20 token from scratch. - Implement a private pre-sale phase for initial investors. - Set up a vesting period for token distribution to prevent immediate selling off. Ideal expertise and skills: - Extensive experience in Ethereum blockchain and ERC-20 tokens. - Familiarity with smart contract security, specifically the implementation of a private pre-sale and vesting period. - Ability to create custom functionality beyond standard ERC-20 token framework. For this project, using typical smart contract security method like OpenZeppelin or Consensys Due Diligence is not preferred. ...

    $21 (Avg Bid)
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    Ethereum MEV Bot Developer 4 days left
    VERIFIED

    We are looking for a skilled blockchain developer with a strong background in creating Maximum Extractable Value (MEV) bots. The ideal candidate will have hands-on experience in developing efficient and fast MEV bots to capitalize on blockchain opportunities, including strategies such as frontrunning, arbitrage, sandwiching, and flash loans. Responsibilities: -Design and develop a high-performance MEV bot capable of executing complex trading strategies on blockchain networks. -Implement algorithms and logic for frontrunning, arbitrage, sandwiching, and flash loans to maximize profitability. -Integrate risk management mechanisms to evaluate and mitigate potential downsides of transactions. -Optimize bot performance for speed, reliability, and scalability to handle high transaction volumes...

    $8277 (Avg Bid)
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    I am seeking a developer to create a tool that can calculate the profit and loss (PnL) for any given Ethereum wallet address. The tool should be able to determine the total number of coins bought, as well as calculate the profit and loss from all transactions associated with the wallet. Key Features: Wallet Address Input: Users should be able to input any Ethereum wallet address. Transaction Analysis: The tool should analyze all transactions associated with the provided wallet address. Profit and Loss Calculation: Calculate the total number of coins bought and the profit and loss incurred from all transactions. User-Friendly Interface: The tool should have a user-friendly interface for ease of use. Skills Required: Proficiency in Ethereum blockchain technology. Experience in cryptocurre...

    $43 (Avg Bid)
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    3 bids

    I'm in need of a skilled developer who can create a custom module for the Cosmos SDK. This module will be focused on token creation. As I've never worked with the Cosmos SDK before, I require someone who is not only familiar with it but also has a strong grasp of blockchain development and tokenomics. Key Requirements: - Development of a custom module for the Cosmos SDK - Focus on token creation - Expertise in Cosmos SDK and blockchain development The successful candidate will need to be able to understand the project requirements, propose solutions, and implement them effectively. Strong communication skills are essential, as is the ability to work independently and proactively. A proven track record in blockchain development and previous experience with the Cosmos SDK are hig...

    $540 (Avg Bid)
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    As a blockchain expert, I am looking for a seasoned developer with specific experience in developing on the Cosmos SDK. My goal is to create a new blockchain, incorporating smart contracts functionality and custom token creation. Ideal Skills: - Strong background in blockchain technology, particularly in the Cosmos SDK - Proficient in developing custom tokens and smart contracts - Proven experience in creating new blockchains - Familiarity with decentralised applications is a plus You need to have a good understanding of blockchain concepts, and have a portfolio that demonstrates your ability to handle similar projects. Please provide a brief overview of your previous experience with Cosmos SDK and new blockchain development in your bid.

    $518 (Avg Bid)
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    I'm seeking a seasoned developer with extensive experience in the Cosmos SDK. The project entails a range of tasks including wallet integration, blockchain development and smart contract deployment. Your primary focus will be ensuring these are seamlessly integrated into the platform. Key Responsibilities: - Implement Wallet Integration: You must have a thorough understanding of how to integrate wallet services into the Cosmos SDK. - Develop Blockchain: Experience in developing blockchains using the Cosmos SDK is essential. You will be responsible for creating a robust and secure blockchain. - Deploy Smart Contracts: Your expertise in deploying smart contracts using the Cosmos SDK will be crucial to this project's success. Deliverables: - Seamless integration of wallet services...

    $554 (Avg Bid)
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    24 bids
    Need to build token on solana 3 days left
    VERIFIED

    Token on solana Name : Make America Great Again Symbol: $Maga Supply : 1 billion Decimals : 9 Tax : 3% buy tax and 3% sell tax(3% to lp and 3% to marketing wallet) *Noone can hold more than 6.7%* (like a supply block) Marketing wallet : GQ5ZVUtoUeLvfAMmUxwMrSNnXacDYSwEZW2abJk2DKcW

    $178 (Avg Bid)
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    4 bids
    Solana Token Builder Needed 2 days left
    VERIFIED

    Token on solana Name : Make America Great Again Symbol: $Maga Supply : 1 billion Decimals : 9 Tax : 3% buy tax and 3% sell tax(3% to lp and 3% to marketing wallet) *Noone can hold more than 6.7%* (like a supply block) Marketing wallet : GQ5ZVUtoUeLvfAMmUxwMrSNnXacDYSwEZW2abJk2DKcW

    $85 (Avg Bid)
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    I am seeking a proficient and experienced Cosmos SDK professional. The primary objective is to integrate the Cosmos SDK with our existing web application. Key Responsibilities: - Utilize your understanding of blockchain technology to seamlessly integrate Cosmos SDK with our web application. - Ensure that the integration enhances the performance and functionality of our platform. - Collaborate with our team to implement the integration in a timely manner. Ideal Skills and Experience: - Deep knowledge of blockchain technology, specifically in relation to the Cosmos SDK. - Proficiency in Golang programming language to effectively carry out the integration. - Prior experience in integrating the Cosmos SDK with existing web applications. - Good communication skills and a collaborative workin...

    $562 (Avg Bid)
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    25 bids

    I'm looking for a seasoned blockchain expert, particularly one with considerable expertise with custom blockchain development.

    $544 (Avg Bid)
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    57 bids

    As an individual beginning a new project, I'm seeking a skilled blockchain expert proficient in Solidity. Your role will encompass the development of a custom blockchain solution on the Ethereum platform. Skills and Experience: - Strong proficiency in Solidity programming - Comprehensive knowledge of how Ethereum works - Proven experience in custom blockchain development - Be able to offer expert blockchain consultation as needed - Previous experience with Ethereum is highly desirable By joining this project, you'll have the opportunity to work on an exciting new project while using latest technologies. Your expertise and advice will be invaluable in creating a secure and efficient system.

    $16 / hr (Avg Bid)
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    45 bids
    Need to build solana token 1 day left
    VERIFIED

    Token on solana Name : Make America Great Again Symbol: $Maga Supply : 1 billion Decimals : 9 Tax : 3% buy tax and 3% sell tax(3% to lp and 3% to marketing wallet) *Noone can hold more than 6.7%* (like a supply block) Marketing wallet : GQ5ZVUtoUeLvfAMmUxwMrSNnXacDYSwEZW2abJk2DKcW

    $419 (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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    I am in need of a skilled blockchain expert who can develop an efficient security API for me. Despite the specifics not being defined yet, I envisage that the APIs will need to offer robust security features. Thus, experience in scalable security infrastructure could be beneficial. Ideally, you will: * Be proficient in Solidity programming - it's crucial for this project. * Have a deep understanding and experience with API security. * Have the ability to design an API with robust security features. * Provide value from the experience to incorporate advanced features. If you possess these skills and have an innovative mindset, please make a bid. While not necessary, including past work, detailed project proposals or relevant experience that you have had could increase your chances o...

    $13 / hr (Avg Bid)
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    22 bids

    I'm looking for a Full Stack Developer experienced in blockchain technology and game development to create a web-based game utilizing Ethereum's blockchain, Node.JS, and wallet integration. The game should incorporate the following functionalities: The game now uses backend for the whole mechanism, but I want to make it more decentralized by using smart contract. As you can check on the game, it uses input wallet address and this kind of operation is not comfortable for users. So I want to integrate wallet connect feature on the game. Are you able to implement all of these features? It could be MetaMask, Coinbase, TrustWallet, Rainbow. Please check our current codebase. - Blockchain Technology: Implement blockchain technology to enhance user experience and security. - Node.JS: ...

    $37 / hr (Avg Bid)
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    I'm seeking a blockchain expert with proficient knowledge and practical experience in Ethereum to build a Decentralized Application (DApp) with the aim of serving the voting industry. Key Responsibilities: - Develop, design and test the Ethereum DApp - Ensure the application is secure and user-friendly - Maintain and improve the application constantly - Deploy the DApp on Ethereum network Necessary Skills: - Extensive knowledge of Ethereum blockchain, as well as related tools and technologies - Experience in coding Smart Contracts - Proven experience in creating DApps, ideally in the voting or related sectors - Excellent problem-solving skills - Detail-oriented with strong analytical skills If you have a keen understanding of the challenges linked to blockchain deployment and a ...

    $227 (Avg Bid)
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    11 bids

    I'm looking for an experienced blockchain developer with expertise in Ethereum smart contract API development. Key API features: - Ability to scan various smart contract code - Honeypot detection - Malicious code detection Required skills: - Proficiency in Solidity and Python - Blockchain development experience, particularly with Ethereum - Demonstrated expertise in API integration - Familiarity with security issues specific to smart contracts If you're a detail-oriented blockchain expert with crowdfunding experience, I'd love to hear from you.

    $15 / hr (Avg Bid)
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    31 bids

    I'm seeking a skilled developer to update my existing Bitcoin wallets with Trust Wallet on my React-based frontend. Additionally, I require integration with Ethereum. The primary functionalities needed are wallet creation and backup for both Bitcoin and Ethereum. Key Responsibilities: - Update Bitcoin wallets with Trust Wallet on React frontend - Integrate Ethereum blockchain with the existing system - Implement functionalities for wallet creation and backup for both Bitcoin and Ethereum Ideal Skills and Experience: - Strong proficiency in React for frontend development - Previous experience with Bitcoin wallet updates and integration with Trust Wallet - Solid understanding of Ethereum blockchain and integration - Experience with developing wallet creation and backup functionalities...

    $1265 (Avg Bid)
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    I'm looking for a knowledgeable developer to create a bot capable of instant buying and selling Solana tokens on Raydium. You'll need to design a bot that executes trades fully automated, without any need for manual approval. Also it should be able to detect any new Pair that has been added and snipe the token in the moment it was added. Therefore you should be able to manually change the transaction fee. Key Features: - Seamless integration with Raydium. - Instant buy/sell execution the moment the liquidity pool gets created - Full automation of trades so the bot is able to spam transactions as long as i want and with given amounts that should vary while spaming transactions Ideal candidate should have: - Experience in programming trading bots - Excellent knowledge of Solana a...

    $89 (Avg Bid)
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    I have a website which collects a bitcoin transaction ID and takes a payment in bitcoin for a service. The main service and front end are already in Wordpress with node.js back end but the payment manager written in Django ASGI. I would like to convert it to Javascript also. It is hosted on a instance in AWS. The django system also has some functions which are no longer required so these can be removed, such that it will only handle the bitcoin payments, wallet and payment address management (I use Electrum) and update the front end with payment status. has 600 llines and has 200 lines of code. Please feel free to reach out with question to help scope the amount of work required.

    $276 / hr (Avg Bid)
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    106 bids

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