Blockchain Jobs

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 Freelancer.com customers have posted amazing projects covering a variety of use cases related to blockchain utilising the Freelancer verified experts. With help from professionals on Freelancer.com 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 Freelancer.com now!

From 71,354 reviews, clients rate our Blockchain Developers 4.81 out of 5 stars.
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    47 jobs found, pricing in SGD

    Blockchain Developer required for Project to create Digital Currency, Don't ping me if not having experience on digital currency.

    $413 (Avg Bid)
    $413 Avg Bid
    8 bids

    Help us build Astaria, an NFT lending platform! Our smart contracts are finalized, we just need help finishing up the front end. You'll be working with an incredible and established team and have the opportunity to come on full time if things work out!

    $21 / hr (Avg Bid)
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    25 bids

    Hello I have front end dev and nft artist in my team for this project. Looking to add someone experienced with creating backend. MERN and solidity experience is a must.

    $2956 (Avg Bid)
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    25 bids
    Blockchain Smart Contract 6 days left
    VERIFIED

    I'm looking for a talented developer to write a blockchain smart contract that meets my requirements. I have selected the Solidity programming language for the task, as I think it is best suited for this purpose. The smart contract may potentially need to interact with other smart contracts in the future, though we're not sure yet. The developer will also be responsible for auditing the code to ensure everything is running correctly. If you have experience in this area and think you can help, I'd love to hear from you! Scenario: We are going to present a classified project to a potential investor or partner. To make sure the presentation will be confidential between the involved participants, I want the attendee to sign an NDA, prior to the meeting or presentation. To m...

    $338 (Avg Bid)
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    19 bids
    Build a blockchain in C++ 6 days left
    VERIFIED

    Hi there, We are looking for someone who can build a blockchain from scratch, using best practice as bitcoin or Ethereum we need a blockchain which reflects some overall rules embedded in the genesis block.. We want to have an initial conversation with anyone who has this type of experience please DM us. thanks CP

    $25385 (Avg Bid)
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    37 bids

    Hi I need a dev that can create and deploy blockchain hyperledger fabric applications. Install the development environment of hyperledger fabric on docker and Kubernetes. Creating attractive web applications in hyperledger fabric Backend using Nodejs. Enable state database for storing blockchain records. File storage using IPFS. Writing smart contracts on Go lang.

    $2207 (Avg Bid)
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    37 bids

    I'm in need of a creative person to help me with a project for 1-3 months. I'm hoping to find somebody who understands my vision and the work that's required of them. I have a specific job description in mind based on my needs and expect that person to complete the task within the discussed timeframe. I'm looking for somebody who is willing to think outside the box and deliver quality results. The successful candidate should be reliable, hard-working and have an eye for detail. This person should also be able to work independently, under pressure and be good at problem solving. If this position sounds like a good fit for your skills and experience, please do not hesitate to reach out. I am very excited to hear what creative ideas you may have to offer to help make thi...

    $1128 (Avg Bid)
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    5 bids

    Hola! Necesito una persona o un equipo disponible para diseñar un Smart Contract, que funcione en la red de Ethereum (ERC - 20, Solidity, Web3). Debe ser una persona con experiencia trabajando con este tipo de lenguajes y creación de este tipo de contratos inteligentes. Hi! I need a person or a team available to design a Smart Contract, running on Ethereum network (ERC - 20, Solidity, Web3). Must be a person with experience working with this kind of languages and creation of this kind of smart contracts.

    $125 (Avg Bid)
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    29 bids

    I am looking for an experienced developer to help me build a slot game using Chainlink’s Verifiable Randomness Function (VRF). Requiered Knowledge: Solidity, Smart Contracts, React, Chaink link VRF,

    $2181 (Avg Bid)
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    58 bids
    Game development 5 days left

    Help us build an open world game similar to Big Time

    $22149 (Avg Bid)
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    43 bids

    An unskilled dev sent me a source code that works except for the remove liquidity part. I'm looking for someone competent enough to solve this issue for me and help me host the dex.

    $763 (Avg Bid)
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    28 bids

    Hi there, I am looking for someone with the following skill: - Near blockchain - Smart contract development (near blockchain) - Nodejs - Reactjs or similar DM me for more information Thanks Fed

    $625 (Avg Bid)
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    70 bids
    Smart contract audit 5 days left
    VERIFIED

    I'm looking for an experienced individual to audit a smart contract built on the Ethereum blockchain. The audit must include both a security assessment as well as a functionality review. I already have existing documentation that will be provided to the auditing contractor. This project requires somebody with a broad knowledge of blockchain technology and practical experience in Ethereum smart contract development. If you fit these criteria, please apply with confidence!

    $28 / hr (Avg Bid)
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    47 bids

    Looking for anyone who can help setup Validator Nodes on multiple Blockchain Testnets. Ping me if you know what you are doing. VPS setup preferred.

    $248 (Avg Bid)
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    4 bids
    need metamask coder 4 days left
    VERIFIED

    I am looking to hire a freelancer to develop a small project involving MetaMask integration. The project requires expertise in smart contract development and I'm open to any programming languages. With my limited knowledge, I need someone experienced and reliable to help me complete the project to a high standard.

    $3 - $11 / hr
    $3 - $11 / hr
    0 bids

    The code to rewrite is here: Please show us your github profile (or similar) while applying to let us evaluate your understanding of blockchain.

    $733 (Avg Bid)
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    28 bids

    Skill Set Needed: Blockchain technology: Understanding the fundamentals of blockchain technology is crucial when building a cryptocurrency transaction framework. You should know how to design, develop, and deploy smart contracts on blockchain networks. Cryptography: Cryptography is the foundation of cryptocurrency, and it is essential to have a deep understanding of how it works to secure transactions. Programming: You should be proficient in programming languages such as Solidity, JavaScript, Python, or Go, among others, to develop and deploy smart contracts on blockchain networks. User Experience (UX) and User Interface (UI) Design: To create a framework that is easy for common people to use, you need to have expertise in UX and UI design. You should know how to create intuitive interfa...

    $216 (Avg Bid)
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    11 bids
    Marketplace multichain 3 days left
    VERIFIED

    We need a marketplace multichain oriented for a niche type. dot names

    $3309 (Avg Bid)
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    74 bids

    experienced developer to connect ETHEREUM / GETH NODE to my PC

    $80 (Avg Bid)
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    4 bids

    experienced developer to connect ETHEREUM / GETH NODE to my PC

    $38 (Avg Bid)
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    1 bids

    i have a wordpress wcfm crypto market place that host wallets via express.js. im looking for someone knowledgeable that can show me an in-site or 3rd party payment processing that will allow users to purchase crypto for their hosted wallets that will also pay my site a 1.75% commission when it is purchased. so far everyone is telling me i need to keep a hot wallet with hundreds of thousands of crypto in it, i dont want this method. i need someone who can tell me a better way. i will have clients that wants to purchase $500-$10,000 at a time. process: 1) user join site 2) wallets are auto created 3) in their dashboard there is already a buy link 4)user click buy, chooses the crypto, type in amount and click purchase 5) this can be a popup or take them to third party site ( i dont care)...

    $1031 (Avg Bid)
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    50 bids

    I want to a simple and secure project that have function. 1. Tron Auto withdrawal and request From tron link or tronweb type. 2. all transactions are showing in tronscan by searching Company name. i have permanent work for good devlopers.

    $133 (Avg Bid)
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    4 bids

    Hello. We have a long term project which it apart from many stages. We are looking for freelancer who will corporate with us and start working on first part of project. If the corporation goes well, we will continue with the same freelancer for second part. For now, we are looking for creating a trading betting competition (simple way) - staking (we will give logic) - and token (we will give tokenomics) - wallet implementations (MetaMask -Coinbase - trust Wallet) Saying that means we need smart contract where will provide the above services and Admin panel. Also we require a design where we will add all the services, even those are upcoming. Looking to hear from you soon. Please pay attention to the budget and bit only if you agree, according to requirements.

    $3221 (Avg Bid)
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    26 bids
    Yiimp Mining Pool. 2 days left
    VERIFIED

    I am looking for a freelancer to help me in adding my coin to Yiimp pool. I already tried bur faced some error that needs to be resolved.

    $199 (Avg Bid)
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    1 bids

    hello I have a digital currency and I want to distribute it to users through a mobile application ,See the image below I want to distribute coins to users automatically ,By linking the currency wallet to the mobile application and distribute it to users Can you do this work

    $669 (Avg Bid)
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    24 bids

    Just need to post to blockchain like WordProof Timestamp or WPSmartContracts but would need a custom solution. possible continues future profits. need to sign an NDA contract for a meeting!

    $212 (Avg Bid)
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    35 bids
    Crypto daap 2 days left
    VERIFIED

    Rebase token daap like titano Rebase toekn Fixed apy 365% daily 1% compound intrest Rebase frequency 86400 sec or 1 day Lottery module

    $3409 (Avg Bid)
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    18 bids

    Looking for an experienced developer to help build an off chain , decentralised, transparent, and secure price feed for decentralized synthetic exchanges using Gun, the distributed graph database library. The project will involve creating a curated list of API providers deemed trustworthy and reliable by the community, with each node on the network connecting to only one provider from the list. A consensus mechanism will also need to be implemented to allow the community to vote on adding or removing providers from the list. Gun's graph database functionality will be used to store and manage the pricing data received from each API provider, allowing for easy querying and retrieval of data by the Chainlink nodes. To ensure off - chain security and validity, Zero-Knowledge (ZK) proo...

    $3816 (Avg Bid)
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    42 bids

    Must have prior experience with DAO, token economics. DAO will track an underlying assets (NFTs), deploy capital to acquire crypto assets and liquidate asset as per demand and supply of token. Need the economist to formulate the structure of the DAO. Please reply by saying DAODAO!! so I know you have gone through my posting. And then tell me more about your prior experience on being a token economist, the project you had involved in.

    $1540 (Avg Bid)
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    5 bids

    Hello all. We are looking from Blockchain Engineer with experience in smart contracts with logic, and experience in development software. More details and flowchart of project we can provide in detail through call. Duration of Development = 50-75 days

    $5705 (Avg Bid)
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    29 bids
    Crypto coins exchange. 1 day left
    VERIFIED

    I am looking for a freelancer to develop a crypto coins exchange that supports Bitcoin. I do not need a wallet system for storing coins and will not require a web-based user interface for exchanging coins. The project should support transactions involving Bitcoin, and no other coins. Any other additional features should consult with me before implementing.

    $15264 (Avg Bid)
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    2 bids
    YIIMP Mining pool configure 1 day left
    VERIFIED

    Need help to add just one sha256 coin to yiimp pool. I already tried it my self and it gives some errors. wallet BfCZgZ9RLgtubHYyj1yVBEKGgA4D2soci8 is not mine. ERROR: rpc_do_call: 404 ERROR getaccountaddress [coin-name]

    $198 (Avg Bid)
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    3 bids
    API ETHEREUM NAME SERVICE 1 day left
    VERIFIED

    We need to use the ENS (Etherim Name Server) API ( ) in our java application. Project requirements - Send request and get responses from ENS API for .ETH domains: I - Register new .eth domains using ENS API, our .wallet metamask - We need to register eth domains using our java application. In our java application will be the our metamask key wallet and the password. II - Other Requeriments: a)Check if a .ETH domain is available for registration and List .ETH domains owned by all users. b) Obtain information about active domains belonging to any user. Example: c) Modify settings of our domains. Example: change controller, dns etc. d) Transfer our domains to other wallets. e) Instructions on how to create an ENS API account and obtain the API key - We need to have access to the E...

    $216 (Avg Bid)
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    11 bids

    Stack: Flutter Knowledge: Dart, Blockchain Budget: $450. Payment in 3installments. Duration: 21days + 7days testing Task: Fix all issues in the app and make it perfect for transactions and upload to Play Store and App Store. Here is the task sheet:

    $758 (Avg Bid)
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    49 bids

    I need 100+ valid infura api keys. Simply delivered in a text file. Simple job. Simply need the required information.

    $169 (Avg Bid)
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    24 bids
    Dropbox decentralized 1 day left
    VERIFIED

    Fully decentralized File immutability Competitive free plan Autonomous

    $3505 (Avg Bid)
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    40 bids

    Im building a small exchange like where users can exchange crypto fast and with no KYC. When a user send crypto to the deposit adress, they have to get notification that the crypto they have sent is confirmed on teh network. I will have like 50 different coins in total. USDT, BTC, ETH, SOLANA, ADA, FTM, and so. Probobly the most popular ones. Total users per day will be very low at the beginning, probobly like 1-10 users a day.

    $186 (Avg Bid)
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    1 bids

    NEEDED FOR IMMEDIATE START, DO NOT SEND YOUR BID REQUEST IF YOU ARE NOT GOING TO RESPOND TO MESSAGES INSTANTLY. Basic Overview: MyBB 1.8.3 forum plugin that gives the forum/community the ability to trade via an automated escrow system using Bitcoin. The plugin should not rely on any 3rd party payment gateways. It should give an option in the MyBB Admin control panel to customise certain functions of the escrow such as; Escrow Fee (the percentage that is added on-top of the transaction) If a buyer or seller is making a transaction for $100 in BTC and our current fee is set to 10% then there should be 3 scenarios. Scenario 1) The creator of the trade chooses an option that the Buyer will pay the fee. This adds the 10% on-top of the BTC payment. Scenario 2) The creator of the trade chooses...

    $629 (Avg Bid)
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    20 bids
    Modify a web3 rideshare app 19 hours left
    VERIFIED

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

    $852 (Avg Bid)
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    44 bids

    I have a samll exchange like sideshift.ai. 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.

    $13 - $40
    $13 - $40
    0 bids
    Flashing btcS software 7 hours left
    VERIFIED

    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

    $40 - $332
    $40 - $332
    0 bids
    Sniper Bot for crypto Trading 2 days left
    VERIFIED

    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...

    $5585 (Avg Bid)
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    17 bids

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

    $28 (Avg Bid)
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    Buscamos redactor/editor/traductor de contenido con gran conocimiento sobre blockchain, DeFi, NFTs…para varios proyectos relacionados con el sector cripto, la función principal será la revisión,traducción al español, corrección y mejora de los artículos publicados, además se puede requerir la creación de noticias, artículos SEO o cualquier contenido escrito que se requiera. Requisitos: • Nivel de inglés: Muy Alto/Nativo • Nivel de Español: Nativo • Experiencia: Se requerirá experiencia demostrable en redacción de contenidos de criptomonedas. • Conocimientos: Gran conocimiento del sector cripto, SEO, Wordpress, se valora conocimiento de Photoshop (básico). ...

    $130 (Avg Bid)
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    5 bids
    DAO-project 4 days left
    VERIFIED

    DAO con el estándar ERC721 Votes que me permite usar como poder de voto los NFTs de una colección. ¿Qué necesito? - Contratos en solidity que conforman la DAO (No necesito el contrato del NFT, porque este ya está creado, solo necesito poder usarlo en dicha DAO mediante una variable que sea _token y que se inyecte al desplegar el contrato en la red de Polygon) - Necesito los métodos públicos para interactuar con dicho contrato en javascript (mi app está escrita en React) con una pequeña descripción de los parámetros de entrada de dichas funciones.

    $73 (Avg Bid)
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    6 bids

    Desarrollaremos una aplicación móvil tanto para Android como IOS: La cual debe tener una interfaz de usuario agradable y llamativa pero a la vez sencilla y fácil de usar teniendo en cuenta que debe poder procesar múltiples partidas y registro de datos al mismo tiempo para que cuando muchas personas ingresen no sé paralice o se caiga o se desconecten las partidas. La operación de la plataforma consistirá en lo siguiente: Debe permitir registrarse esto podría ser con Google, facebook o en caso de que no sea complejo un formulario. Debe poder permitir vincular una Wallet en la cual los usuarios podrán depositar Criptomonedas en este caso USDT es por ello que se deberá usar la Blockchain de Tron, también debemos d...

    $3699 (Avg Bid)
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    12 bids

    La Idea es partir de este ejemplo como prototipo El funcionamiento sería el siguiente: Los usuarios se registrarían en el sitio Web Una vez registrados podrán realizar depósitos en este caso a una wallet de la plataforma y se les acreditaría el saldo virtual en la web, con este saldo podrían ir entonces y escoger un juego y de acuerdo al costo de la entrada poder iniciar una partida, dónde el sistema los emparejara con otros jugadores que estén deseando iniciar una partida. Una vez obtengan un beneficio podrían hacer solicitudes de retiros. Los depósitos podrían ser en cualquier criptomoneda ejemplo BTC, ETH u otro pero la misma web debería dar la opción de convertirse en USDT para poder refl...

    $2762 (Avg Bid)
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    21 bids

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