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    3,206 solidity jobs found, pricing in USD

    - add, save, change username connected to address - mint NFTs with url - mint NFTs for 1,2 or 3 different erc20 tokens - transfer x erc20 tokens to address given into the function - marketplace buy and sell NFT in exchange of erc20 token and many more...

    $12 / hr (Avg Bid)
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    29 bids

    Building an application based on EnergyWeb chain. Need someone with ideas/experience with blockchain concepts and skills listed. Must be able to perform basic interface creation and backend development to implement features and concepts in REACT UI, NodeJS, TypeORM, Ethers, Solidity architecture

    $35 / hr (Avg Bid)
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    68 bids

    I have an urgent task for someone good in machine learning and blockchain technologies. Expertise in Python, Machine learning, Rust, and Solidity is essential. You must also be proficient in Solana and ChatGPT

    $188 (Avg Bid)
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    ...as the Cardano community, to identify and implement new features, troubleshoot and debug code, and improve the overall performance of the Cardano blockchain. Responsibilities: Design and develop dApps on the Cardano blockchain platform Write smart contracts using Solidity and Haskell Collaborate with the Cardano community to identify and implement new features Troubleshoot and debug code Collaborate with other developers to improve the overall performance of the Cardano blockchain Requirements: Strong experience with Solidity and Haskell Experience with decentralized application development Strong understanding of blockchain technology Strong problem-solving skills Excellent communication and collaboration skills Familiarity with Git and other version control systems Ed...

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    Our react based website almost ready to launch MVP needs experienced developer to come in and fix some bugs. Current dev is very busy but is able to onboard new developer as needed. The dApp being created are Solidity/React/NodeJS based and require advanced relevant experience. Technical Requirements: Solidity, , React.js, Node.js Development and testing best practices. Commitment to schedule Conscientious manner Please be in touch to schedule a call to discuss the project details to see if we are a good fit for each other. We are ready to hire asap.

    $214 (Avg Bid)
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    Code Solidity 4 days left

    Hi there, I hope everything is well! I'm a software developer me too, as you are and I'm reaching you cause I need help with it. I've developed a small Solidity/NodeJS Hardhat project but I'm stuck executing a specific call to the smart contract because I'm getting errors in that specific script point. So, let me know if we can go ahead with it or if you need more pieces of information about We can discuss the fixing's budget after you'll have a clear idea about the error Here the repo: Branch where the error is: toFix

    $190 (Avg Bid)
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    23 bids

    Our react based website almost ready to launch MVP needs experienced developer to come in and fix some bugs. Current dev is very busy but is able to onboard new developer as needed. The dApp being created are Solidity/React/NodeJS based and require advanced relevant experience. Technical Requirements: Solidity, , React.js, Node.js Development and testing best practices. Commitment to schedule Conscientious manner Please be in touch to schedule a call to discuss the project details to see if we are a good fit for each other. We are ready to hire asap. *We don't recomment agencies. An independent freelancer is required.

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    ...application that streamlines the management of cryptocurrency deals on the Ethereum ecosystem. As a full-stack DAPP developer, you will play a crucial role in bringing this vision to life by creating the DAPP from scratch using the latest technologies. The successful candidate will have the opportunity to work on a greenfield project, designing the frontend using Figma, creating smart contracts using Solidity, building the backend using Node.js, Express and MongoDB, and ChainLink or Provable as Oracle. To get a better understanding of the DAPP workflow, please refer to the sequence diagrams attached. Our team is smart, professional, and results-driven, and we are looking for someone who shares our passion for creating a game-changing application. If you are an experienced DAPP ...

    $4644 (Avg Bid)
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    This should be a quick job for someone that has skills on it. I need to make my solidity contract work with any erc20 Token. It currently only works with native tokens like BNB or ETH. The dapp Will need to be fixed to Connect with the changes made on the contract

    $150 (Avg Bid)
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    1. Energy Market of 4 nodes 2. A portal for placing bids and offers 3. Matching will be done based on Merit order dispatch 4. Trades will be executed by smart contracts 5. Overall, thing will be on blockchain (language: Solidity)

    $48 (Avg Bid)
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    ...source code The contract should perform basic escrow functions between a buyer and seller (buyer pays the contract ERC20 tokens which are the paid to the seller after a period of time). You will need the following skills - 1. Solidity - version 0.8.0 2. remix IDE - compiling contracts 3. ERC20 token logic - need to understand approve and allowance in an ERC20 contract 4. Metamask - need to understand how to approve txns 5. testing solidity code in remix 6. understanding how escrow works with buyers and sellers 7. understanding how addresses work in ethereum and solidity, including importing tokens into Metamask 8. understand OpenZeppelin standards No UI implementation is needed (just remix) but the final code needs to be in a state so it can be transferred later...

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    I am posting this project here since I have not found any answers online yet. If this is not technically possible, then I will cancel this project. We are looking for someone to build a utility - in Java - that will download and analyze a Solidity Smart Contract's functions to determine if any of them create, destroy or move value. For example, ERC-20 token transfers are performed through a smart contract function with: Event signature: Transfer(address,address,uint256) Keccak-256 hash: 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef That event causes the transfer of tokens from one blockchain address to another. We can get a transaction receipt (via ETH's JSON-RPC), confirm whether the transaction included that event, and then determine that token...

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    54 bids

    I am working on a Yield aggregator project similar to Beefy.finance. I need help with the smart contract to create two pool. It's NOT about coding whole smart contract. We can copy from the beefy finance repo on Github. I just need to customise the contract as per my requirement. More details will be provided to interested bidder. Please Bid on this project only If you have experiance with Yield farming coding. Budget is fixed.

    $150 (Avg Bid)
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    Create a smart contract in solidity with the following functionality. Any wallet can send an encrypted message to another wallet. The sendMessage function takes the recipient address and the message as input parameters. The message is then encrypted with wallet-to-wallet (peer-to-peer) encryption and put it on the blockchain. The receiveMessages function returns the array of all decrypted messages where the is the recipient. The goal is to read the actual messages sent by the sender and only the recipient should be able to do that. It is important that the messages can only be encrypted with the public address and decrypted by the owner of the recipient wallet WITHOUT providing the private key. Use signature or anything of that sort to solve it. Import external open-source libr...

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    Solidity Developer Hire Type Task-Based Skills Solidity Description We are looking for a skilled Solidity developer. Task would be to implement smart contracts according to our specs. We already have a lot of the groundwork done and for a senior individual should be a quick task. Tasks will include basic DEFI integrations but no rocket science. If you are available for the next 3-4 weeks please hit us up on discord. Compensation TBD Talent Location Remote Looking to post a job or join the network?

    $29 / hr (Avg Bid)
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    ...to get arbitrage opportunities. Our smart contract (in solidity) takes the parameters required from the bot, performs the swaps and verifies if the arbitrage was profitable or not. We've had a small handful of successful trades. We noticed we are getting the opportunities too late, we get crumbs, which are higher than fees, so we are not profitable. We are using a semi private node on BSC. We are looking for assistance about search/find arbitrage opportunities, finding consistent tradeable token pairs and paths, so we can feed our bot and/or contract and see better results. Could be a function on nodejs that returns a json result (we will provide the json format). Code must be written in nodejs typescript file, you can query solidity contracts if you need extra d...

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    I am in need of a solidity expert who will be responsible for smart contract development.

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    We want a developer familiar with Erc20 Contracts, and solidity to create a tutorial video or teach us how to copy and paste this exact contract + verify it on etherscan for educational purposes.

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    Looking for very strong and highly available FE developer to assist on Trading Dashboard development. Some of the features that we would be looking for you to develop are things like an interactive backtester. Solidity experience is plus but not a requirement. Some core requirements: - Be able to deal with high level of coordination and take interest in the product - Long term commitment - Be communicative

    $28 / hr (Avg Bid)
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    A network of 4 peers needs to be established where they will trade their surplus power through smart contracts. The quantum of power that needs to be traded will come from a backend python code which i already have.

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    We want a Unique Ethereum (ERC20) contract using pragma solidity ^0.8+ with some required functions like; 1. Max wallet/Max Transaction 2. Buy/Sell Tax - Divided into 3:2:2 = 7% [Liquidity|Marketing|Platform] 3% tax going directly to Liquidity, 2% + 2% into the developer wallet (owner). 3. Open Trading 4. Blacklist function All the basic rest functions should be there. Need a unique contract, not a copy-paste, I will know if it is.

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    We need a solidity expert to add feature to our smart contract before we deploy it to mainnet (currently MATIC), we need a feature that has capability to lazy mint (gas free mint) in our site. and we do also need to optimize our current contracts to reduce it's contract size. We are using ERC721 and openzeppelin library contract upgradable. You also need to discuss how you will plan this setup.

    $726 (Avg Bid)
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    I need to create NFT reward contract by using solidity and call all functions in new dapp by using react. details by anydesk

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    wallet and payment app, currently built on Algorand, wanting to integrate eth and btc

    $14 / hr (Avg Bid)
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    I’m looking for an solidity developer who is able to fork tomb.com. It is an Defi Yield Protocol. Experience with EVM/ FVM, tokenomics, smart contracts.

    $1380 (Avg Bid)
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    i created web3 dapp for NFTS coliction using thirdweb react js next js solidity, i need change some things in main contract and add this changes on my dapp. work by anydesk with maximam 5 hours

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    i created web3 dapp for NFTS coliction using thirdweb react js next js solidity, i need change some things in main contract and add this changes on my dapp. work by anydesk with maximam 6 hours

    $28 (Avg Bid)
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    i created web3 dapp for NFTS coliction using thirdweb react js next js solidity, i need change some things in main contract and add this changes on my dapp. work by anydesk with maximam 5 hours

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    Hello, I'm currently looking for a coder with solidity, react.js, Truffle & all blockchain technology experience. The project needs someone with knowledge to create a presentable coffee shop web3 Dapp that is clean, professional & functional. This web3 website must be integrated with company smart contract, functionality and systems. Task: Test & Deploy Smart contract Minor Updates to Solidity contract Connect Solidity Contract to frontend Create Presentable, Professional, functional Dapp Website Design Examples: (Home Connect Page Example) (Landing Information page Example) (Coffee Menu page Example) (Subscription + Physical location Info Page) (Royality + Rewards

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    ...Metamask, Binance's Trust Wallet etc.), • Hold an account for large number of users on our web3 marketplace, • Social media connection ability (Discord, Telegram, Facebook, Twitter, Tiktok, Youtube, Instagram) • The platform front end MUST be Web3 based, so as to interact with Web3 and crypto wallets, • Ideally built on the Stacks blockchain using the Clarity language, otherwise built in Ethereum's Solidity is fine, for now, • The ability of the front end to interact with multi-chain back ends. MUST HAVE: (a) Candidates MUST have built and deployed marketplaces in Web 3.0, ideally as an NFT marketplace or Web 3.0 store. You must be able to send examples of live Web 3.0 websites you have built. (b) You will be part of a small team working wi...

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    Looking for Solidity and Blockchain EXPERT. Don't bid if you are intermediate I am looking for Solidity Contract developer who can consult for 2-3 hrs with my team and clear our doubts.

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    Looking for solidity developer who can write smart contract for bep 20 and erc 20 and can integrate as well .

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    Sealed
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    8 bids

    I require a simple scaled down version of a spreadsheet that can add, subtract, multiply and divide, with the ability to tag and place various financial items in columns, for the creation of home budgets. The program must be able to create simple pie charts of the data. A price range for this project would be appreciated? Program to be written in Solidity. The program must be complete such that it can be uploaded to an Ethereum compatible blockchain and used as a dAap/Smartcontract for customers that would develop their own budgets. I require some idea of the cost involved as this is new to me as it pertains to the technology, so I was unable to estimate the cost on your menu.

    $10 - $11
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    18 bids

    ...supply totale del token. Le gas fee saranno comprese nel prezzo. Il token dovrà essere anche verificato su BSCscan o Polygonscan e io potrò visionare tutte le transazioni e qualsiasi specifica del token. Da includere anche funzioni come: funzione burn, autoburn, transaction tax. Dovrò essere UNICO owner dello smart contract, avere la total supply della cryptovaluta nel mio wallet, il source code in solidity, il link di BSCscan o Polygonscan. Dovrò poter aumentare a mio piacimento l'immissione di nuovi token e determinare il valore iniziale del lancio sul mercato....

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    ...is processed. Once the data has been processed on the blockchain (smart contracting), it is sent back to the mobile app. This allows the mobile app to display both the collected and processed data to the user. The app can only be accessed by authorized conditional registered devices or users. The system should be highly secured (APIs, authentications, App, etc.). - Smart Contract Development: Solidity ETH, creating data structures over blockchain, creating crypto-wallet (deposit, withdraw, send). - Mobile App Development (iOS & Android): 1- Connecting the Mobile application using Bluetooth to the device to collect data and sending information to the blockchain smart contracting for processing, storing, and returning data to the app. 2- Different layers of authentication...

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    Our team is looking for a serious developer which is interested to commit 8 hours of daily work for few projects we're managing in the web3 space. Our platforms are mainly using the following languages: React js, solidity smart contracts, mongodb, aws, vercel, and web3 For more details please reach me out if you are willing to get involved and join our team. We are looking for a serious long-term collaboration!

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    NDA
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    24 bids

    Hyperverse in partnership with SafuuX is hosting an Hackathon. Me and my team developped an idea for over a month and we only need a developer to do the contract. Here's the link to the hackathon: I need someone to: - Understand the requirements of the hackathon - Solid experience with Solidity - Use the smart modules by Hyperverse to achieve the result - Use the SafuuX builder kit. The deadline is December 19th. Please see attached the use case the contract needs to do.

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    I want to call localhost node js APIs from solidity smart contract (in react js project). Local APIs such as: GET list: http://localhost:3001/api/cities POST: http://localhost:3001/api/city ... UPDATE : http://localhost:3001/api/city ... There is project attachment, you can see all the notes inside and files If you want to use Oracle Blockchain then it must be free, not paid service. You need to explain all steps to do that from my side, if there are problems, then you can access to my system using Team Viewer or any disk for example. Thanks,

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    Hello. I am a full-stack developer myself and I have a Blockchain Project on Ethereum Network. I need someone who is expertised in Ethereum to build JackPot Lottery Smart Contract. Quick Approach is needed. Thank you.

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    *** attach your CV *** We are looking for an outstanding Blockchain developer on a full-time (40h per week), for a period of at least 6 months, with possibility of extension. The role is fully remote. Requirements are: -Proficiency in programming languages like Solidity, Python, Javascript, Rust or others related to blockchain development; -Proficiency with smart contract development (ERC-20, ERC-721, ERC-1155 or similar) -Proficiency in using Alchemy, Moralis (or similar application development frameworks) -Experience in designing, developing blockchain applications -Knowledge of standard algorithms, data structures and cryptography Please note: * For our customers knowledge of English is extremely important. * It is a contractor position, no employee benefits will be included in...

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    The Project would be building and completing 4 Automated Trading Strategies for Options in Crypto Currencies. This would be a User Application, where the Users can choose between the 4 Automated Options Trading Strategies, and t...Token would need to be built and created for this. The Automated Strategies would be buying and selling options on Decentralized Exchanges for Crypto Currency Options, and an Exchange for Spot Market for Crypto Currencies. Documentation of API and Source Code is provided open source from Exchanges websites. Time Frame : 1 to 2 weeks. Type of Developer - Full Stack Development Skills : Solidity, JavaScript, Python, TypeScript, Frameworks - for JavaScript & Python, HTML, CSS Further Understanding of Blockchain and Trading, and Derivatives Tradi...

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    First of all I am a developer and know solidity and lot of experience in blockchain domain. Only apply if you know what you are talking about and confident you are an expert. If you know what you are doing, its two hour job, max 3 hours I have cloned a DAO voting platform in ETH chain You have to integrate 4 new screens to the DAA I already developed. DAO voting works. New screens are ready. You just have to integrate new screens to the old UI. There is no new development, no debugging or any complicated work. You also have to change the LINK token for voting power to the PRVT token which is attached. DAO is already working in eth chain. DAO token is LINK NOW, NEED TO CHANGE TO our token PRVT NEW screens -

    $33 / hr (Avg Bid)
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    The Project would be building and completing 4 Automated Trading Strategies for Options in Crypto Currencies. This would be a User Application, where the Users can choose between the 4 Automated Options Trading Strategies, ...need to be built and created for this. The Automated Strategies would be buying and selling options on Decentralized Exchanges for Crypto Currency Options, and an Exchange for Spot Market for Crypto Currencies. Documentation of API and Source Code is provided open source from Exchanges websites. Time Frame : 1 to 2 weeks. Type of Developer - Full Stack Development Skills : Solidity, JavaScript, Python, TypeScript, Frameworks - for JavaScript & Python, HTML, CSS Further Understanding of Blockchain and Trading, and Derivatives Trad...

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    We need a blockchain developer for our DEFI project. Skills required- Solidity, NodeJs, React

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    1 No Escape, No Problem 2 No Big Deal 3 Pulling Out the Rug 4 Let the World Speak for Itself 5 Poison as Medicine 6 Start Where You Are 7 Bringing All That We Meet to the Path 8 Drive All Blames into One 9 Be Grateful to Everyone 10 Cutting the Solidity of Thoughts 11 Overcoming Resistance

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    Hello, im looking for solidity dev. What I need: -Token contract(simple contract only with tax for buy/sell) -Jackpot contract + website to manage it How jackpot should work: -Players deposit our token(in contract should be min. and max contribution variable to set and max players at once, and max overall stake)

    $250 - $250
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    0 bids

    Hello, im looking for solidity dev. What I need: -Token contract(simple contract only with tax for buy/sell) -Jackpot contract + website to manage it How jackpot should work: -Players deposit our token(in contract should be min. and max contribution variable to set and max players at once, and max overall stake) -Every player have chances to win. More he deposit, more ticekts he get, soo he have higher chances -Jackpot round start when the overall stake is full or when reach maximum numbers of players for round, or after 2mins from second bet(soo if there is only one player jackpot wont start) After game winner takes all minus tax On website should be button to connect wallet, deposit button, player profile(last games, win games etc) in profile there should be option to set avatar...

    $250 (Avg Bid)
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    First of all I am a developer and know solidity and lot of experience in blockchain domain. Only apply if you know what you are talking about and confident you are an expert. If you know what you are doing, its two hour job, max 3 hours I have cloned a DAO voting platform in ETH chain You have to integrate 4 new screens to the DAA I already developed. DAO voting works. New screens are ready. You just have to integrate new screens to the old UI. There is no new development, no debugging or any complicated work. You also have to change the LINK token for voting power to the PRVT token which is attached. DAO is already working in eth chain. DAO token is LINK NOW, NEED TO CHANGE TO our token PRVT NEW screens -

    $21 / hr (Avg Bid)
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    I need someone to fix a few issues in a solidity contract. It will be on the Etherium network, but I have been testing on testnet. Transfering of tokens does not show up in users wallet (reduces owners amount and sends but does not show in users Wallet Create a test Liquidity Pool for the token to test the tax with buy and sell ( I need to have access to this) Airdrop feature needs fixing - should send a desired amount ie 1,000,000 / all holders - to all holders wallets Tested so far and working Burn - sends to dead wallet and reduces supply - works SetBuy Tax - works SetSell Tax - works GetSell Tax - works GetBuy Tax - works burn amount set to remove decimals - works get burn amount set to remove deicmals - works set tax off and on - works Get tax status true or false -...

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