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!

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    38 trabalhos encontrados, preços em EUR
    Crypto Currency Arbitrage Finder 6 dias left
    VERIFICADO

    The full description of the project and the requirements are in the attached video, created on Invideo AI (please ignore water marks and quality)

    €530 (Avg Bid)
    €530 Média
    4 ofertas

    Smart Contract Developer for DeFi Arbitrage with Flash Loans Project Overview: We are on a mission to find a skilled freelance Smart Contract Developer to craft an innovative smart contract for arbitrage across multiple crypto exchanges using flash loans. This project demands a fusion of technical skill, creativity, and comprehensive knowledge in DeFi ecosystems, financial and legal frameworks, and blockchain deployment strategies. The ideal candidate will have in-depth experience with Ethereum-based smart contracts, DeFi protocols, cryptocurrency exchanges, tokens, regulatory compliance, and financial principles. Responsibilities: - Design and develop a smart contract for multi-exchange arbitrage using flash loans, ensuring adaptability to different exchanges, cryptocurrencies, and fla...

    €43 / hr (Avg Bid)
    €43 / hr Média
    13 ofertas

    Se requiere desarrollar un contrato inteligente, el cuál consiste en la creación y puesta en marcha de un sistema de donaciones descentralizado en la red de Solana, aunque también se está abierto a otras sugerencias. Dónde se utilice para las donaciones entre los usuarios el token de la misma red en ese caso SOL y que funcione en una estructura multinivel con matriz de 4 frontales x 6 niveles de profundidad. Se requiere conjuntamente la página web de presentación del proyecto donde cada usuario pueda visualizar sus datos más importantes, referidos y comisiones. Las páginas web acá son solo un ejemplo de estamos abiertos a modelos más llamativos o más sencillos sin poner en riesgo la funcionalidad del s...

    €9 - €28
    €9 - €28
    0 ofertas

    Realign yourself. Shape the future for learners with velpTEC edutainment. velpTEC edutainment is an institute for further education that specializes in innovative technology. It blends business experience, futuristic insights, and new educational strategies. Our programs practically support individuals in enhancing their skills for the future, enabling them to actively shape their lives. We prioritize social responsibility, progress, and autonomy in our efforts. Education at velpTEC edutainment happens through our digital platform where learners access e-learning courses for self-study, engage in forums for exchange of ideas and participate in online workshops to apply their knowledge. Are you ready for a new mission? Explore your future opportunities at velpTEC and join our diverse and...

    €27 / hr (Avg Bid)
    €27 / hr Média
    25 ofertas
    BEP20 Token Launchpad Listing 5 dias left
    VERIFICADO

    I want to list/sell my BEP20 token through any launchpad, if you already do, then message me. I am looking to see who is already done on pinksale.finance. then only bid

    €1513 (Avg Bid)
    €1513 Média
    2 ofertas
    Blockchain Developer 5 dias left
    VERIFICADO

    I am seeking a skilled Blockchain Developer who has expertise in integrating Web3 wallets and smart contracts with custom websites. Now, we are building the powerful Metaverse project. As a Blockchain Developer at our team, you will play a key role in developing and maintaining our web applications, with a particular focus on blockchain integration. Responsibilities: ✅Collaborate with the development team to design and implement blockchain features. ✅Integrate Web3 wallets (such as MetaMask) withcustom website to enable seamless interaction with blockchain networks. ✅Integrate smart contracts into custom website to enable decentralized functionality. ✅Implement user interfaces and user experiences that are intuitive and responsive. ✅Collaborate with backend developers to ensure seamless i...

    €22 / hr (Avg Bid)
    €22 / hr Média
    37 ofertas
    GameFI and Crypto Strategist 5 dias left
    VERIFICADO

    We're looking for a web 3 strategist and trader to do research for the following requirements. - GameFI market analysis - In game NFT trading strategies and research - Community outreach for game specific metadata and mechanics - Creating reproducible trading and analytic methods If you feel like this is you or believe you have the right skills, please shoot a message! A brief description(a few sentences at most) of how you would accomplish such tasks would also be appreciated.

    €75 (Avg Bid)
    €75 Média
    2 ofertas
    NFT Marketplace Multiversx 5 dias left
    VERIFICADO

    NFT Marketplace I already have a live dapp with cool features, like nft staking and a token swap. I am looking to add the ability to buy, sell, trade NFTs into my existing site. I am looking for someone who has built with Multiversx before and understands their latest technology. Please answer 5 + 7 to confirm you have read the whole message and that you have previous experience building on multiversx

    €1158 (Avg Bid)
    €1158 Média
    78 ofertas

    I attached a screenshot that shows the problem. It shows runtimes error. and it shows some problems when connect wallet. candidate should solve that problem. it is an urgent thing, so I need to start it immediately. Requirement Skills and Experience - Proficient in ReactJS with a strong understanding of its core principles. - Experienced in debugging and error handling within React applications. - Experienced in Web3 for connect wallet - Bonus for Blockchain Detailed attention and a fast turnaround. Thank you

    €491 (Avg Bid)
    €491 Média
    112 ofertas

    I need a Blockchain Ethereum expert. I am looking for a small script that retrieves bulk CSV data about wallets for me. The program should retrieve the following data for each wallet and each trade: Token Symbol Token Address Timestamp Average Buy Price Average Sale Price Quantity Sold Profit Example: tokensymbol;tokenaddress;timestamp;average purchase price;average sale price;quantity sold;profit NUKE;0x15fab216dcd2ab04b264bf8f3bcfc592040c63fc;1709217944;0.002317428;0.00708655203531;3803.28488 SARATOSHI;0x073fa9e7c4a59c30aca06a7eaeb0ea40e72fd8eb;1709217944;0.015280273;0.01242540125417;-1270.38307 FROGS;0x8389899f385a7ac9401e77b14e5fd40f3e9f27b8;1709217944;0.001587797;0.00285406348825;744.8409617 The script should essentially read all DEX trades from the blockchain and retrieve this dat...

    €142 (Avg Bid)
    €142 Média
    30 ofertas

    I'm looking for an experienced Solidity developer who can help me build a complex decentralized application (dApp). The ideal candidate will: - Come with a strong background in smart contract development - specifically advanced functionalities such as decentralized exchanges and complex dApps. - Be skilled in Ethereum blockchain integration. - Have the ability to conduct thorough Solidity audits. Other services the candidate will have to provide include: - Contributing valuable implementation guidance regarding contract execution. - Ensuring continued support in terms of maintenance and upgrades even after project completion. - Carrying out security audits to identify and rectify potential vulnerabilities - knowledge of ethics hacking will be a big plus. I consider these skills ...

    €13 / hr (Avg Bid)
    €13 / hr Média
    18 ofertas

    As part of a passionate technology team, we've been drafting a brilliant blockchain project around Ethereum. We are seeking a talented, or a group of skilled blockchain developers to bring this project to life. Key Responsibilities: - Analyze our blockchain project concept, assess the feasibility, and provide suggestions for design, efficiency, and security - Execute smart contracts and DApps development around Ethereum blockchain platform Ideal Candidate: -Has knowledge and experience in Ethereum blockchain -Is open to providing constructive feedback on project design, functionality, and security -Can work collaboratively in a team environment to achieve project objectives -Adequate blockchain development skills; Intermediate level preferred Note: For an in-depth understanding of...

    €33 / hr (Avg Bid)
    €33 / hr Média
    49 ofertas

    I'm looking for blockchain developers skilled in smart contract development, token creation, and website design to facilitate my meme coin project. The primary objective of this coin is to raise funds via presale. Key services required include: - Blockchain platform creation - Wallet development - Token design and distribution - Writing an intermediate level smart contract with included restrictions and rewards mechanism to boost engagement. The coin's website should feature: - Comprehensive token information - Real-time tracking of token performance - A secure user area for token purchases. Candidates with solid background in smart contract coding, website creation, and cryptocurrency development are favored. Experience in presales is essential. The project success hinges on...

    €695 (Avg Bid)
    €695 Média
    81 ofertas

    I use the site to make loans against NFT's. I have my own set of criteria that I use, and I would like to automate it as much as I can. Currently, I spend hours per day looking through collections to pick only a very small number that I am interested in. I would like to make a bot that monitors the site and notifies me by email and text message when the collections I'm interested in have loans at auction that meet a certain APY, LTV, Rarity, Listing status, etc. I don't think it's too complicated, but it's outside of my area of expertise. I would like this project to be a focus for someone I hire so that I can get it finished sooner.

    €7 / hr (Avg Bid)
    €7 / hr Média
    25 ofertas

    I have Project that need to improvement in both frontend and backend. We are going to add wallet to this platform, so the experience with Crypto is plus.

    €31 / hr (Avg Bid)
    €31 / hr Média
    37 ofertas

    Operator required for which is being operated as as part of the Digitizing Trade network. would feature a platform for provision of web and e-commerce services to companies in Columbus by the operator, as well as the provision of Trade Digitization services to companies in Columbus using tools supplied and supported. is the prime internet brand for Columbus Trade. It is a valuable resource that will appreciate in value. The intention would be for the operator to build it up as a primary resource on the Internet for companies in Columbus is part of a Network that co-operates with B2B Marketplaces with millions of subscribers... Trade Digitization is like an incoming wave. Organizations that don't embrace it, could be swept away Digitizing Trade in Physical Goods Requires t...

    €44 / hr (Avg Bid)
    €44 / hr Média
    15 ofertas

    I'm in need of expertise to resolve a recurring error in my current platform built with Flutter. The error message is "insufficient fund from gas * price + +value” and it is incredibly disruptive to the operation of the platform. I've verified I have enough gas balance in my wallet to cover the transaction. My application is utilizing an outdated version of the web3dart Flutter library. It's necessary for the freelancer to have experience working with the older versions of this library. The ideal candidate would have: - Proficient knowledge of Flutter - Extensive experience with the web3dart Flutter library - Proven track record in resolving similar bugs - Comfortable working with outdated system libraries Your task will be to: - Analyze the system and error - ...

    €27 (Avg Bid)
    €27 Média
    14 ofertas

    I need a Quorum blockchain developer to connect existing nodes with my main node. You should have experience in Genesis block, Geth. This task needs to be done asap. Please only bid on this project if you’re sure.

    €253 (Avg Bid)
    €253 Média
    14 ofertas

    I am in need of an experienced developer to take on the task of building a cryptocurrency wallet for me. This project will require proficiency in encryption security, payment gateway integration, and sleek, branded design. Key Features: - Support for multiple cryptocurrencies: The wallet must be able to handle transactions not just for one type of crypto, but several. This is a key component of what I am looking for in the final result. - Secure transaction encryption: To ensure user trust, I want the wallet to have well-implemented, robust encryption for all transactions. - VisaNet integration: This is a non-negotiable requirement. The wallet needs to have the ability to accept payments via VisaNet. Design: I am looking for a customizable design with branding options. It should reflect ...

    €8 / hr (Avg Bid)
    €8 / hr Média
    10 ofertas

    About Us: We are an innovative startup dedicated to environmental projects aimed at mitigating CO2 and methane emissions in the atmosphere. Our mission is to create tangible solutions to combat climate change and promote sustainability for future generations. Our Mission: At our core, we are driven by the urgent need to address the environmental challenges facing our planet. By leveraging cutting-edge technology and creative solutions, we strive to reduce greenhouse gas emissions and foster a healthier, more sustainable environment. What We Offer: As part of our commitment to making a positive impact, we are embarking on an ambitious endeavor to develop a cryptocurrency tailored to funding our environmental projects. This cryptocurrency will serve as a groundbreaking fundraising tool, empo...

    €1997 (Avg Bid)
    €1997 Média
    6 ofertas

    I am looking for a skilled developer to create a fully tested and secure website (frontend, backend + admin panel) with no bugs or issues using the MERN Stack. The key features of the front end design include a responsive design, user-friendly navigation, and custom animations. For the backend it would be clean, and fast high quality code with comments and good organisation and readability. The ideal candidate will have experience working with tight deadlines, provide constant high quality updates and be able to deliver quality work within a short timeframe. Tech: Front-end Framework: React.js with + Typescript Styling: Tailwind CSS Back-end Framework: Node.js with Database: MongoDB Goal: Build a cryptocurrency gambling website from PSD + Figma designs and requirements provided and ...

    €1751 (Avg Bid)
    €1751 Média
    52 ofertas

    I'm venturing into a new enterprise that will greatly benefit from the development of a unique cryptocurrency token. The token will be primarily used for fundraising purposes which will fuel our project's growth and expansion. Key Project Information: • Blockchain Platform: Ethereum – developers who have a robust knowledge of ERC20 or ERC721 token standards should apply. • Primary Function: Fundraising for a project – not a loyalty scheme or transaction token so emphasis is on security and coin value growth potentials. • Business Use: This project has commercial applications, being for the kickstarting of a new enterprise I’m working on, hence, commercial insight would be invaluable for the successful development and launch of our coin. Desire...

    €1194 (Avg Bid)
    €1194 Média
    6 ofertas

    I'm looking for proficient JavaScript game developers who also have an in-depth understanding of blockchain mechanics. The core focus of this project is to breathe new life into existing JavaScript games by integrating specified blockchain functionalities. Key Blockchain Mechanisms: - Smart Contracts - Login with Web3 Wallet - Web3 Wallet Connect Overall Project Goal: About the wallet connect and logic: Overview: We want to integrate Web3 wallet connect functionality into an existing JavaScript game to allow users to log in using their Ethereum wallet addresses. Functional Requirements: 1. User Registration: - Implement a user registration system where users can sign up with their email addresses and create a username/password combination. (Already Implemented) - Store...

    €522 (Avg Bid)
    €522 Média
    82 ofertas

    Operator required for which is being operated as as part of the Digitizing Trade network. would feature a platform for provision of web and e-commerce services to companies in Nashville by the operator, as well as the provision of Trade Digitization services to companies in Nashville using tools supplied and supported. is the prime internet brand for Nashville Trade. It is a valuable resource that will appreciate in value. The intention would be for the operator to build it up as a primary resource on the Internet for companies in Nashville is part of a Network that co-operates with B2B Marketplaces with millions of subscribers... Trade Digitization is like an incoming wave. Organizations that don't embrace it, could be swept away Digitizing Trade in Physical Goods Requires...

    €47 / hr (Avg Bid)
    €47 / hr Média
    20 ofertas

    I want to develop a Broswer where users can win Token as rewards for watching Advertisement on the browser. I will share more details in personal communication

    €552 (Avg Bid)
    €552 Média
    8 ofertas

    I'm in need of a specialist in Solana transactions for an upcoming project. This task requires a specific understanding and capability in bundling transactions in Solana. The main goal is to effectively bundle token transfers in a consistent, secure, and efficient manner. In terms of transaction volume, anticipate handling between 1,000 and 10,000 transactions daily. Ideal Skills For the Task: * Expertise in Solana blockchain technology * Proven experience in bundling transactions, particularly with token transfers * Ability to handle high volume transactions daily * Knowledge in blockchain security measures to protect transactions being bundled * Excellent problem-solving skills, as well as innovative thinking Interested professionals should have a strong record of transaction ha...

    €118 (Avg Bid)
    €118 Média
    12 ofertas

    I'm seeking an experienced cryptocurrency developer to help develop a stable crypto coin, which is not highly volatile but rather, grows gradually with real value. Key Requirements: - The coin should be based on an existing blockchain platform. - The coin should have a stable value with a slowly increasing growth rate. - It needs to be designed in a manner that allows for liquidation and utilization in real-world projects such as construction, banking, property management, and environmental protection. - An innovative mechanic for sharing profits back with the coin holders will have to be implemented. Required Skills & Experience: - Proven experience in cryptocurrency and blockchain development - Thorough understanding of Blockchain technology and cryptocurrencies - Famil...

    €597 (Avg Bid)
    €597 Média
    17 ofertas

    We are seeking a talented and experienced Blockchain Developer or a team of developers to upgrade our existing Roulette Game project to incorporate blockchain technology. The successful candidate(s) will play a pivotal role in enhancing the game's security, transparency, and overall user experience by implementing cutting-edge blockchain solutions. Responsibilities: Collaborate with the existing development team to understand the current architecture and functionality of the Roulette Game project. Analyze and identify areas of improvement in the game's security, fairness, and user experience. Design and implement blockchain-based solutions to enhance the game's functionality, transparency, and reliability. Integrate smart contracts into the game's logic to ensu...

    €6226 (Avg Bid)
    €6226 Média
    22 ofertas

    I need to check the Add Liquidity, Farming, and Stake functions and make Launchpad on EVM (Linea, ETH, and zkSync). Your main responsibilities include: - Enhancing the efficiency of the aforementioned functionalities. - Thoroughly checking these functions to ensure they are operating optimally.

    €1059 (Avg Bid)
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    13 ofertas

    I am in need of highly skilled developers to create an MEV Bot on the Solana chain via Raydium, utilising the Sandwich strategy. Proficiency in programming languages such as Python, Rust Key Project Requirements: - Ensuring swift transaction speeds - Developing the bot's ability to identify opportunities Applicants must provide a detailed project proposal outlining their intended approach and strategies. The successful applicant will have demonstrated an understanding of the project goals and the capacity to deliver a high-performing MEV bot. Strong experience in blockchain development and bot creation will be highly regarded.

    €336 (Avg Bid)
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    29 ofertas

    Operator required for which is being created as as part of the Digitizing Trade network. would feature a platform for private trade blockchains created by the operator laid our along the lines of what is at Blockchains.Business. is the prime internet brand for Trade Blockchains. It is a valuable resource that will appreciate in value. The intention would be for the operator to build it up as a primary resource on the web for private Business Blockchains, something that is becoming very necessary indeed for many org#anizations. Blockchain and smart contracts Services offered by the operator will also be featured at . The operator would be the exclusive provider of blockchain /smart contract services featured at Private blockchains are exclusively accessible and controlled by a sin...

    €29 / hr (Avg Bid)
    €29 / hr Média
    21 ofertas

    My team and I are envisioning a BSC token linked to Yield Farming. We haven’t yet created a whitepaper for this project, hence the ideal candidate will have experience in writing comprehensive, informative whitepapers and translating abstract ideas into clear and concise documentation. I also need someone to develop the token itself. The token will have a unique feature of Reflective Holding Rewards, setting it apart from existing ones. Expert knowledge on this mechanism will be highly beneficial. Potential candidates should: - Have significant experience in BSC token creation, particularly in the Yield Farming area - Be knowledgeable and competent in publishing tokens on the Binance platform - Possess strong writing skills for crafting an impactful whitepaper - Have experience ...

    €373 (Avg Bid)
    €373 Média
    24 ofertas

    I'm in need of a skilled web3 developer who's especially proficient in Laravel and JavaScript for a DApp project. Our application requires an integrated blockchain for secure and reliable processing and a DApp for decentralized control. Features to be implemented are: - User authentication - Payment system tailored toward accepting payments for goods/services Experience and Skills Needed: - Proficiency in Laravel and JavaScript is a must - Proven experience in blockchain integration, preferably in DApp projects - A strong understanding and prior work history of integrating payment systems. This project will center around enabling transactions for goods and services. Therefore, expertise in creating a robust payment system is crucial. Applicants must be able to wor...

    €32 / hr (Avg Bid)
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    66 ofertas

    As an EVM user, I'm interested in a seasoned NodeJS developer with experience in cryptocurrency and blockchain technology. The objective here is to develop a precise, efficient, and bug-free NodeJS script that enables contract interactions on ZKSync, a layer-2 scaling solution for Ethereum. Your tasks will include: 1. Developing NodeJS script. 2. Ensuring script is attuned to ZKSync. 3. Enabling the script to send transactions involving Ethereum andn other ERC20 tokens. 4. NFT purchases. A successful completion of this task would require: - Proficiency in NodeJS - Knowledge of EVM chains - Understanding of web3 transactions - Experience in AMMs / Swap applications Please see the attached brief for more details

    €184 (Avg Bid)
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    27 ofertas

    I require a revenue sharing membership site for creators. Payouts will be on % of activity/interaction with anti cheat measures in place. Users will upload content (videos, images, text, links) such as social media sites. Creators will have a free public profile and will choose which content is free and which content is for paid members. The site will have a free video roll section with tiktok style short videos that they can scroll through. There will also be a paid members video roll with premium content. Admin will get a %, creators will get a % and referrals will get a % of the total monthly fee revenue generated. referrers can login to member area to get referral links and see stats and update payment information. Payment for the site, creators and referral partners will all by crypto...

    €753 (Avg Bid)
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    49 ofertas

    I want a manual approval dex where users cannot instantly add their tokens to the dex. Users will need an audit by a selection of preferred auditors from a list. No fee required for listing but we will have to manually approve. Will also need a token developed for the project with taxes and dex token will be default on the home page. Layout will have a chart integrated but users can decide to hide chart. Will be very modern design and responsive. Fees will go to admin. Holders of project token will not pay tx fees. Dex will trade eth and bsc pairs. Users will choose which network and will be able to trade eth pairs with eth network and bsc pairs on bsc.

    €1405 (Avg Bid)
    €1405 Média
    50 ofertas

    Need deflationary token with % of tx gets burned until a certain minimum supply level has been reached. Token will have crypto assets in smart contract that the token will be pegged to for valuation.  IMPORTANT FACTORS: Coin must pass an audit Coin must not have mint function Coin must exempt owner and dev address from fees Must have renounce ownership function Must have no back doors or security issues You MUST deploy upon completion and send all token to me. You as the deployer will have no executive rights or roles in contract. Coin must have holder rewards tax Coin must have tax to admin wallet Coin must have tax to smart contract (pegged) Must have option to write function to exempt other address from fees

    €883 (Avg Bid)
    €883 Média
    13 ofertas

    I am in need of an experienced React.js developer with knowledge in Node.js and the blockchain technology. Who can provide me a readymade roulette multiplayer game for my website. Although optional, an understanding of Ethereum, Bitcoin or Hyperledger Fabric provides an advantage. While the specific features or functionalities were not provided, experts with skills in user authentication, data encryption and smart contract integration will be valued. Also, despite your preferred platform or technology, a proficient command of Windows, Mac, or Linux will be beneficial. Requirements: • Proficiency in React.js and Node.js • Knowledge in blockchain technology . Knowledge of web 3.0 • Experience in User Authentication, Data Encryption, and Smart Contract Integration would be...

    €100 (Avg Bid)
    €100 Média
    6 ofertas

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