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Blockchain, is a technology that encompasses digital records or information, referred to as “blocks”, that are linked together securely and share the same network. This distributed ledger technology is the backbone of a new wave of innovation being implemented into our lives, with new disruptive applications and solutions seen in a growing number of industries. Clients may hire a Blockchain Developer to harness this power and build a secure digital platform tailored to their business needs.

A Blockchain Developer can create unique solutions leveraging blockchain technology to securely store, access, mine and distribute data in an efficient manner. They can leverage features such as blockchain tokens for payments, smart contracts for automated transactions, privacy layers and data protection techniques. Additionally, the expertise of a Blockchain Developer will ensure the project complies with industry standards, ensuring secure data and validation.

Here's some projects that our expert Blockchain Developer made real:

  • Creation of custom applications for fast and secure NFT (Non-Fungible Token) transactions
  • Developments of tools that allow synchronization with physical products using Bluetooth protocol
  • Integrations between wallets hosting cryptographic assets with ecommerce providers
  • The establishment of exploratory networks to provide insights into decentralized ecosystems
  • Developments to foster the growth of peer-to-peer energy trading networks

At customers have posted amazing projects covering a variety of use cases related to blockchain utilising the Freelancer verified experts. With help from professionals on customers can create unique projects addressing their business needs with safety, security and legality in mind. Rock your blockchain project today and hire an expert Blockchain Developer on now!

De 71,151 opiniones, los clientes califican nuestro Blockchain Developers 4.8 de un total de 5 estrellas.
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    49 trabajados encontrados, precios en USD

    El proyecto Comunidad Tokenizada basada en Blockchain busca crear un ecosistema digital en el cual los miembros de una comunidad sean recompensados con tokens por realizar diversas tareas y contribuciones. Este ecosistema se basa en una plataforma blockchain que garantiza la seguridad, la transparencia y la descentralización de las interacciones entre los participantes. El objetivo principal es fomentar la participación activa y el compromiso de los miembros de la comunidad, permitiéndoles acumular tokens como una representación de su influencia y esfuerzo. Estos tokens podrán ser utilizados para ejercer mayor poder en la toma de decisiones dentro de la comunidad, así como para acceder a beneficios y oportunidades exclusivas. Las reglas y estruct...

    $2400 (Avg Bid)
    $2400 Oferta promedio
    10 ofertas
    Modify a web3 rideshare app 6 días left

    There's an open project at: I need someone to integrate more features like map, admin dashboard, and rider/driver registration page.

    $558 (Avg Bid)
    $558 Oferta promedio
    40 ofertas

    I have a samll exchange like When a user sends crypto to the deposit adress , i need the user to get a notification/message when the crypto is accepted by the network.

    $10 - $30
    $10 - $30
    0 ofertas
    Flashing btcS software 6 días left

    Hi freelancers I’m looking for btc flashin,g software which will generate the coins without any network fees. The coins will be trad,able, splittable and transferable

    $30 - $250
    $30 - $250
    0 ofertas
    React Web3 Dapp Development 6 días left

    Project Title: React Web3 Dapp Development Project Description: We are seeking a skilled freelancer to develop a React Web3 Dapp into an existing React template we have () that will allow us to accept crypto payments for documents that we are selling. The Dapp will need to integrate WalletConnect on the BSC network and support payments in BUSD, USDC, DAI, or BNB. The Dapp will also need to perform POST calls to our backend when is required and display the result on the frontend according our needs. Scope of Work: Web3 Connectivity: The freelancer will create and integrate Web3 connectivity using WalletConnect (Web3Modal 2.2.1 with wagmi) on the BSC network on an existing React template. Crypto Payment: The freelancer will add support for crypto payments in BUSD, USDC, DAI, or BNB and det...

    $280 (Avg Bid)
    $280 Oferta promedio
    43 ofertas

    I want just to verify my token on bscscan i have this error (Unable to generate Contact ByteCode and ABI)

    $27 (Avg Bid)
    $27 Oferta promedio
    6 ofertas

    Project is based on Blockchain , you just have to create the Frontend and connect it with Backend

    $7 (Avg Bid)
    $7 Oferta promedio
    1 ofertas
    Build me a DApp 5 días left

    I'm planning to build a simple decentralized rideshare Dapp that links riders and drivers, such that rides could be booked. It'll be based on blockchain and uses smart contract.

    $826 (Avg Bid)
    $826 Oferta promedio
    37 ofertas

    We are looking for Ethereum and web3 experts to make our Web3 project a success. Our team already includes talented designers and front-end developers, and all the groundwork has been finished to start our project. Following the launch of the NFT mining site, we plan to launch several related websites such as games, airdrops, NFT marketplaces, and DEX. Review project plans and explore possibilities. Our projects are both urgent and long-term, so we need the fastest experts. At first please check our project to get all information and roadmap, check the implementation or possibility, then contact me. A quick and complete implementation will increase your chances of being hired. At first I recommend you to check the project. Please explain to me about errors that occurs at the first on the...

    $4566 (Avg Bid)
    $4566 Oferta promedio
    13 ofertas

    I am in need of an experienced Smart Contract developer who can help me bring my project up to speed. The technology I'm using is Ethereum, and I have a rough idea of the project, though I need assistance to bring it to fruition. Additionally, this project requires the contract to be written in the Solidity programming language. To ensure success, the developer must possess expert level knowledge and experience with smart contracts, specifically Ethereum and Solidity. Furthermore, they must have the technical know-how and communication abilities to work independently and follow detailed instructions. Only experienced and qualified individuals should apply. I am looking forward to working together to achieve a common goal. If you have the skills and expertise, please do not hesitat...

    $36 / hr (Avg Bid)
    $36 / hr Oferta promedio
    32 ofertas

    I need someone to help me on how to calculate the shortest path and the optimal input amount for a DEX triangular arbitrage bot. I would provide a json structure of the data that includes pool addresses, liquidities and assets prices then i would need some graph method to quickly calculate the shortest path with arbitrage opportunity and define the optimal input amount for the found arbitrage. It would return the data to execute the trade (pools addresses, amounts etc) Experience in this field would be better.

    $103 (Avg Bid)
    $103 Oferta promedio
    23 ofertas

    - Skill Set Required: Advanced knowledge of EVM and tools required for on-chain development, such as remix-ide ganache truffle, etc., and replicating smart contracts (forking protocols) using existing codes on another EVM-compatible blockchain. Comfortable using GitHub. Complete understanding of on-chain and open-source solidity protocols including but not limited to core contracts and peripheries and their functionalities and operations within a protocol (such as DEX and DeFis). Ability to understand the backend functionalities of EVM protocols with little effort and easily able to fork multiple interdependent Smart Contracts to other EVM-compatible blockchains. (Such as forking a DEX from Ethereum mainnet to polygon or Binance smart chain) Comprehensive understanding of Uniswap v...

    $4 - $5 / hr
    $4 - $5 / hr
    0 ofertas

    I'm looking for a developer to create an engaging and immersive blockchain-integrated porker game -play according to current poker rules, number of players is 8 or 6. Players can create their own table and invite friends to play together for fun The game should be designed from the ground up and feature an entirely new and distinctive look. As the game will run on the blockchain, it must be secure, with all data stored on the chain. The game should feature elements of both chance and strategy. Finally, I am seeking a developer experienced in creating gaming experiences who can bring all the elements together into one cohesive, entertaining game.

    $10250 (Avg Bid)
    $10250 Oferta promedio
    16 ofertas
    Write Smart Contract on TRON 4 días left

    Write and integrate Smart Contract on TRON Blockchain for USDT for a membership Portal. Smart Contract must be verified and name should be portal name.

    $307 (Avg Bid)
    $307 Oferta promedio
    19 ofertas

    pls check the attached file and tell me if you can do it Start your bid with (Block)

    $250 (Avg Bid)
    $250 Oferta promedio
    10 ofertas

    pls check the attached file and tell me if you can do it Start your bid with (Block)

    $51 (Avg Bid)
    $51 Oferta promedio
    2 ofertas

    I'm looking for a developer to create an automatic crypto sniper bot that includes customizable parameters such as minimum liquidity, maximum tax, slippage tolerance, stop-loss, and take-profit settings. Additionally, I would like the bot to be hosted on a cloud server for efficient and reliable performance. The bot should have anti-scam features to avoid fraudulent coins and exchanges, and a user-friendly interface that is easy to navigate. Requirements: Customizable parameters such as minimum liquidity, maximum tax, slippage tolerance, stop-loss, and take-profit settings Cloud server hosting for efficient and reliable performance Anti-scam features to avoid fraudulent coins and exchanges User-friendly interface that is easy to navigate Please provide details of your experi...

    $1296 (Avg Bid)
    $1296 Oferta promedio
    21 ofertas

    Create a modern cryptocurrency website from designs Tech: + Typescript + TailwindCSS MERN stack Goal: Build a cryptocurrency gambling website from PSD designs and requirements provided and discussed (google docs). Must be fully secure and fully tested with no bugs or issues. Experience Needed: - Send an example of your previous experience with Full Nodes ("Bitcoin Core" for Bitcoin and "Geth" or others for Ethereum) -Send an example of your previous experience making Desktop/Mobile responsive websites -Send an example of your previous experience accurately converting a PSD design to a fully responsive website using MERN stack (or similar stacks) Timeline: ~45 days

    $19132 (Avg Bid)
    $19132 Oferta promedio
    65 ofertas
    Sniper Bot for crypto Trading 4 días left

    Please create a crypto trading bot based on ethereum Blockchain with different contracts addresses that I could enter (Metamask, uniswap pool essentially). I would like to have it as a as a chrome Extension or it can be React (front end)/ nodejs) Back end) app, or any other solution that gets the job done for a reasonable cost. I would like to work with a developer who has experience building a bot like this and can provide previous projects as proof of your ability to execute this in a high-quality fashion. It should operate smoothly and enable transaction to run quickly once the desired strategy is selected. The BOT would essentially include: A simple UI for the bot where I can manage parameters such as: the amount of the trade, slippage tolerance (on or off) , range or amount t...

    $4138 (Avg Bid)
    $4138 Oferta promedio
    13 ofertas
    want crypto developer 3 días left

    want crypto developer using python or any to develop something

    $30 - $250
    $30 - $250
    0 ofertas

    I want to get payment through trust wallet. and want to show the Balance of trust wallet. and transfer money to another trust wallets after processing of commissions. I just want to add one for my existing MLM software (web).

    $298 (Avg Bid)
    $298 Oferta promedio
    11 ofertas
    Cryptomining Expert 3 días left

    I need bloackchain expert for long term relationship start your bid with Block

    $147 (Avg Bid)
    $147 Oferta promedio
    22 ofertas

    I'm looking for a talented freelancer to work on a React decentralized exchange (DEX) project. For this project, I'm looking for someone with experience in JavaScript/Node.js, HTML/CSS, and React technologies. The successful applicant should have plenty of past work and demonstrable experience to draw from, as well as a detailed project proposal. It's Urgent and Long tems

    $176 (Avg Bid)
    $176 Oferta promedio
    16 ofertas

    i want crypto developer i have an idea about a program written in python

    $175 (Avg Bid)
    $175 Oferta promedio
    2 ofertas

    We are looking for an experienced DApp developer to build a website capable of staking TRON token. The website should have multiple staking pools with different APR and staking periods. The ideal candidate will have experience with building similar DApps and is familiar with the TRON ecosystem. Responsibilities: Develop a DApp website capable of staking TRON token Create multiple staking pools with different APR and staking periods Integrate a user-friendly UI/UX for easy navigation Implement smart contracts for automatic staking and unstaking Ensure the security and scalability of the DApp Requirements: Strong experience in DApp development Proficiency in smart contract development and Solidity programming language Knowledge of the TRON ecosystem and its tools such as Truffle, Remix, an...

    $909 - $1817
    $909 - $1817
    0 ofertas

    Please see attached detailed "Project Summary" PDF. I need a fixed price and schedule for developing remote mining and staking software that will run on Linux OS. I need an experience Blockchain developer, with experience with mining and staking API Software if possible. Start Your bid with MINING to be cosidered

    $902 (Avg Bid)
    $902 Oferta promedio
    8 ofertas
    The Sandbox 2 días left

    create a game on sandbox for NFTs

    $160 (Avg Bid)
    $160 Oferta promedio
    4 ofertas

    Greetings everyone. We are looking for a freelancer with more than 5 years experience on the fields of Blockchain, smart contracts and Web 3. Requirements - Desing and Logo of platform - Smart Contract of Token (Tokenomics needed to be in logic of smart contract and the smart contract to have the staking logic too) - Integration of Metamask , Coinbase and Trust wallet - Connecting price from 20 different exchangers API (Selling Price - Asking Price - Average Price) - Users to be able to buy subscriptions to use the services. Subscription must be able to get paid through our token and through another 10 tokens we will share with you - Creating Admin Panel from where we can do the following : backend we must connect trading view chart and from admin us to be able to draw technical...

    $5329 (Avg Bid)
    $5329 Oferta promedio
    15 ofertas
    NFT gated project 2 días left

    Build the mining and loan protocol in token gated SocialFi ecosystem.

    $1435 (Avg Bid)
    $1435 Oferta promedio
    26 ofertas

    I want a app which will store your whole mobile pn block chain Like I have mobile one and I sign up and I stored it on block chain Then I will take different mobile sign up put the credentials and access mobile one. And will need donate option in it and the mobile will be live no need to download. UI/UX should be good. Also keep in mind that I am student so funding will be less

    $6082 (Avg Bid)
    $6082 Oferta promedio
    3 ofertas
    Blockhain Project 2 días left

    To implement a Secure Blockchain framework to transfer information between teams/clubs. Note-This is not a big project it is an academic project only Ideas are welcomed to discuss what to implement in this.

    $14 (Avg Bid)
    $14 Oferta promedio
    5 ofertas

    We have a working Blockchain which is EVM compatible We need a functional multisender/bulksender which takes cvs or any excel file format and send our native token to amount we want For that manner you need to deploy multisender to our mainnet. Regarding that we are gonna send you to more information for this project

    $616 (Avg Bid)
    $616 Oferta promedio
    19 ofertas
    Testnet Crypto Wallet MVP 2 días left

    I am in the process of founding a new enterprise and am looking to have a custom testnet crypto wallet created that is tailored to sending and receiving payments in the mobile environment. As the business is still in the early stages, I am looking for a testnet MVP solution that will provide basic functionality for the project. The aim is to create a simple-to-use wallet that quickly and reliably processes payments in the testnet with only USDC and WBTC in the Polygon network.

    $2526 (Avg Bid)
    $2526 Oferta promedio
    6 ofertas
    Crypto Telegram Bot 2 días left

    Hi looking for crypto telegram bot that tracks the buys and sells within a smart contract. Delivery 12 hours.

    $315 (Avg Bid)
    $315 Oferta promedio
    16 ofertas

    I need to verify the integrity of our blockchain by doing a hackathon and check for vulnerabilities in our network

    $25 / hr (Avg Bid)
    $25 / hr Oferta promedio
    4 ofertas

    It’s working fine but not the best performance We want that enhanced Also, some of the fonts are epic, when you create trade you can see the fonts they are bad Also, the token drop-downs are not perfect The first drop-down doesn’t show the whole coin list And the position of the limo and market button when you want to swap I believe if the developer is able to test the current ui he can also point out other things he will note We just want the dapp working perfect and fetch data for the dashboard also. The chart is fixed but doesn't work when deployed online only works locally not sure why it's being blocked The trade data font are not well formated…this is the preffered font --font-sm: 1.4rem; --font-base: 1.5rem; --font-md: 1.6rem; --font...

    $162 (Avg Bid)
    $162 Oferta promedio
    10 ofertas
    Build me an app 1 día left

    I want a app which will store your whole mobile pn block chain Like I have mobile one and I sign up and I stored it on block chain Then I will take different mobile sign up put the credentials and access mobile one. And will need donate option in it and the mobile will be live no need to download. UI and UX must be good

    $18 (Avg Bid)
    $18 Oferta promedio
    2 ofertas
    Blockchain performance 1 día left

    Hyperledger performance evaluation

    $177 (Avg Bid)
    $177 Oferta promedio
    9 ofertas
    Hyperledger Fabric Chaincode 1 día left

    I'm looking for a Freelancer to help me with developing some Chaincode for Hyperledger Fabric. The ideal candidate should have extensive experience with Chaincode and Hyperledger Fabric, since the project requires an expert understanding of both technologies. Preference will be given to those with a portfolio showcasing their previous work, showing familiarity with said technologies. The project is relatively straightforward so the time requirements should be minimal – however, the final deadline can only be set after further discussions about the specifics of the project.

    $550 (Avg Bid)
    $550 Oferta promedio
    5 ofertas
    Cryptocurrency Gambling Game 1 día left

    To Whom It May Concern, Myself and my business partner are looking at creating an online gambling game that uses cryptocurrency as a form of payment, which is integrated into it’s own website. Currently, we are in the stage of finding a developer, we will go into more detail privately. Thank you, we hope to hear from you ASAP. Similar layout and functionality to Just a different game CON Talk more in detail

    $5991 (Avg Bid)
    $5991 Oferta promedio
    17 ofertas

    We seek a knowledgeable web3/blockchain generalist to write good, complete, thorough, well-researched project plans/proposals/estimates for projects to develop and deploy blockchains, cryptocurrencies, Dapps, DeFi apps, CEXs, DEXs, NFTs, and other components of the web3 ecosystem. (** no agencies please **) You Must: - Have demonstrable prior experience developing web3/blockchain projects. - Be able to write and speak in English clearly and fluently. - Be willing to sign an NDA (at a later stage in the interview process). - Be willing to use the time tracker. If all of the above describe you accurately, we would love to hear from you. To be considered, you **must** include answers to the following questions in your response: a) Are you a developer knowledgeable ...

    $2 - $8 / hr
    $2 - $8 / hr
    1 ofertas

    Comparison performance in KPI, among Hyperledger, PKI, Blockchain, Ethereum, and DPKI . The graph data should be below the parameters: Which applications are used for capturing the data like (Putty) screenshot also required. 1. Total execution time of the transaction, 2. successful transactions, 3. average latency, and 4. total throughput

    $678 (Avg Bid)
    $678 Oferta promedio
    14 ofertas

    I require an expert with immediately availability for a case review. Estimated time is 3 Hours. The goal of this project is to complete a case project review report. Knowledge required is : 1. Computer security and Malware Analysis 2. Network Security, Dos Attack and botnets, firewalls defence and intrusion detection system system security, Windows, Linux, Android and containerisation , RSA , private and public key protocols and others, key management, 5. blockchain protocols 6. security models

    $164 (Avg Bid)
    $164 Oferta promedio
    16 ofertas
    Smart contract solidity -- 2 18 horas left

    For dead wallet function (smart contract) : -Give the possibility of being able to add the cryptos that you want to send before signing the contract By default, you can select bnb, busd, usdt, cake, eth, usdc, flash token BEP20 and the rest need add smart contract manually -Each crypto charges additional transaction fees because to return the cryptos we will need gas fees for each crypto -User can set timer by minutes, hours,days and years -The user must enter the recipient address only an address that starts with 0x (Disallow user to enter anything else to avoid errors) -We must also be able to define a price according to each day example 1 day = 0.03 cents if a person uses 1 year we make 0.03*365 days = 10.95 + our own fees. This calculation applies for 1 cryptocurrency if you have ...

    $795 (Avg Bid)
    $795 Oferta promedio
    42 ofertas

    I'm looking for an experienced Freelancer to help me with integrating NFT Crossmint payment into my WordPress website. The primary purpose of doing this is to provide my customers to buy NFT using domestic and international credit cards for making their payments. I already have access to the Crossmint API and no matter which WordPress theme I'm using, I need help in making this integration happen. If you have the expertise and experience in Crossmint Payment integration on WordPress websites, then I'm looking forward to hearing from you soon. Thank you! I have very good experience with Wordpress but need the Blockchain expert how can answer my questions to help me with integration.

    $15 / hr (Avg Bid)
    $15 / hr Oferta promedio
    36 ofertas
    Web security in PHP 16 horas left

    We need PHP developer for web security if you can do a web security the definitely will meet in the chat

    $44 (Avg Bid)
    $44 Oferta promedio
    8 ofertas
    LynneStays 7 horas left

    A DApp that allows people to pay for short-term hotel rentals or Airbnb easily and simply. Something similar to AirBNB

    $2782 (Avg Bid)
    $2782 Oferta promedio
    12 ofertas
    Block chain 6 horas left

    Have to propose an idea from an existing paper and implement the idea

    $33 (Avg Bid)
    $33 Oferta promedio
    5 ofertas

    I currently have a Songbird Node which we can use for it. I need to just update it automatically with a cronjob

    $23 (Avg Bid)
    $23 Oferta promedio
    6 ofertas

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