Solidity is a programming language that is primarily used to create decentralized applications (dApps) and crypto tokens. It is used within the blockchain space to code, verify, and secure transactions on Ethereum-based networks. By hiring a Solidity Expert, they can write, debug and deploy various smart contracts on Ethereum as well as ensure compliance of their smart contracts with standards like ERC20 & ERC721 tokens.

Having a qualified Solidity Expert can bring you the peace of mind knowing that you are dealing with a subject matter specialist. Freelancer.com has many skilled Solidity Experts who can help you build sophisticated software solutions with the highest of quality with their proficiency in writing efficient smart contracts in Solidity.

Here's some projects that our expert Solidity Experts made real:

  • Updating existing Smart Contracts
  • Developing financial bots and trading networks
  • Creating dApps on alternative blockchain networks
  • Designing new money transferring systems
  • Auditing pre-existing token protocols
  • Creating novel blockchain ecosystems
  • Developing NFT marketplaces

When it comes to blockchain coding and programming complex code, there is no better way to do it securely than using Solidity. With its ever increasing importance in many facets of decentralized technology, having an experienced Solidity Expert on your team could be the competitive edge you need. So why wait? Post your project now on Freelancer.com and hire a Solidity Expert and create an unthinkable product or system!

From 22,222 reviews, clients rate our Solidity Experts 4.85 out of 5 stars.
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    27 jobs found, pricing in USD

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

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    [READ BEFORE BIDDING PLEASE] I’m looking for an expert in decentralized finance (DeFi) to build a swap&bridge platform on Base using OP stack Superchain. This project needs to be completed as soon as possible. Key Specifications: - Using latest version - The platform should feature token swapping and Bridge functionalities. - Responsive on pc browser and on phone - The system should allow users to seamlessly swap various tokens. - While I haven't identified specific token standards yet, your suggestions based on prior experience are welcomed. Desired Skills and Experience: - Experience building DeFi swap sites. - Understanding of OP Superchain. - Effective communication and timely delivery.

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    I'm seeking a skilled blockchain developer to work on a project that involves creating a new contract and token on the TON blockchain. Key Responsibilities: - Develop the Smart Contract: You will be responsible for the design and development of a smart contract that aligns with the project's specific requirements. - Token Creation: You'll also need to create a new token on the TON blockchain. Requirements: - Expertise in blockchain development. - Proficiency in TON blockchain. - Previous experience in smart contract and token creation. - Strong understanding of blockchain security. Your work should adhere to basic security measures. Your experience in blockchain, particularly in TON, will be essential to ensure the integrity of the contract and token.

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

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

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    Polygon Smart Contract Audit 5 days left
    VERIFIED

    We are looking for an expert in smart contracts, specifically those deployed on the Polygon blockchain. Your application should include past work that demonstrates your experience in this field.

    $534 (Avg Bid)
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    Need to complete project 5 days left
    VERIFIED

    I have a pre-sale project. Staking, pooling, and governance must be completed. It is not yet complete and has not been deployed to servers. If you have good experience, please check the project and let me know the budget and time to complete the project. Share the repository. And I would like to hear your advice to complete the project successfully. I want to finish it within 3 months. Requirements Technologies: Frontend, Blockchain, Web3, Backend, Database, Solidity, API Integration. thank you

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    I'm seeking a competent blockchain developer with strong experience in creating smart contracts on the Ethereum network, or what I refer to as the base network. The primary objective of this project is the automation of financial transactions. This smart contract should be proficient in not only automating these transactions but should also possess the ability to interact with other smart contracts for the seamless execution of transactions. Possessing a keen understanding of the technical aspects involved in swapping one type of token for another, and staking and unstaking tokens would be beneficial but it's not a requirement for this particular job. IDEAL SKILLS AND EXPERIENCE: - Extensive experience in developing smart contracts on the Ethereum network - Proficient in Soli...

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    I'm in need of a seasoned blockchain developer with in-depth Ethereum knowledge to build a smart contract for a decentralized finance platform. This Dapp will be entirely decentralized, free from any central authority influence, hence it’s a critical aspect of this project. Key Requirements: * Extensive experience in smart contract development on Ethereum * In-depth understanding of DeFi protocols * Skilled in building fully decentralized platforms The successful candidate will have an extensive understanding of decentralized systems, Ethereum blockchain, and DeFi platforms. Solid experience in smart contract development is a must. Your main task will be constructing a smart contract that underpins my DeFi platform, ensuring maximum security and efficient resource utilizatio...

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

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    **Project Title:** Automated Crypto Arbitrage Bot with Flash Loan Integration and Desktop User Interface **Project Description:** I'm seeking a skilled blockchain developer with strong Python expertise to build a cutting-edge cryptocurrency arbitrage bot. This bot will leverage flash loans for automated profitable trades on major decentralized exchanges. **Core Functionality:** * **Real-time Monitoring:** The code must continuously monitor cryptocurrency prices across all major decentralized exchanges (DEXs). * **Arbitrage Detection:** The bot will use Python for data analysis to identify profitable arbitrage opportunities where a significant price difference (exceeding 0.09% + gas fees) exists for the same cryptocurrency across different DEXs. * **Flash Loan Integration:** The...

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    I'm seeking an expert in Web3 and Solidity to lead me through practical exercises in Smart contract development, Decentralized applications (dApps), and Blockchain integration. The ideal candidate must be: - Proficient in Solidity and Web3 with a strong background in the deployment of smart contracts and dApps. - Capable of explaining complex concepts in an understandable way, and guiding through practical exercises, and have patience. - Experienced in real-world projects that demonstrate the successful application of blockchain technology. Given my basic knowledge in the field, I'm looking for a tutor who can help me further develop my skills through hands-on experience by guiding me through building a smart contract using 'ThirdWeb' SDK platform. I'm exc...

    $34 / hr (Avg Bid)
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    I'm on the hunt for pre-built Web3 games. Further specifications of the game type were left open-ended, so any genre from collectibles, role-playing, to strategy games may be considered. Are you currently working on a Web3 Game? Did you already finish making a Web3 Game? Do you perhaps worked on a Web3 game before and own the rights? We are interested in 1. buying the code and rights 2. Or listing it on our platform This is a unique opportunity where you can sell your existing Web3 Gaming Project to us or list it on our platform. Write down the following: -Platform(s) of the game -Technologies you used to make the game -Concept and type of game (5-10 sentences) -Price estimate I'm NOT looking for someone to build a game from the start!!! You have to have an already working...

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    I am actively seeking a co-founder who can demonstrate a high level of proficiency in multiple programming languages (including Python, Java, JavaScript, Golang, C Programming, Blockchain, Ethereum, Bitcoin, C#, C++, Swift, Kotlin, Rust, Dart, Flutter, and Smart contract) to assist in building between 7-12 new and unique ideas that I'm sure will have millions of online downloads. **** DISCUSSION OF HOW THE OWNERSHIP WILL BE SPLIT WILL BE PRIMARY. ONE TIME/ONE-OFF PAYMENT OF 100 DOLLARS (80 POUNDS) WILL BE GIVEN TO THE CHOSEN CO-FOUNDER AS A WELCOMING/CO-FOUNDER PARTNERSHIP FEE**** Key Requirements: • Extensive technical and programming skills, with a focus on a variety of programming languages. • Familiarity and comfort working with Blockchain, Ethereum, Bitcoin, and Smar...

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    I'm looking for an expert developer to build a copy trade and front running bot that works on Solana. The bot needs to copy trades from a wallet that is using a custom program to buy/sell tokens. In addition to copying trades, the bot will also have to buy and sell before the target wallet. So the bot should use Gulf Stream to search on pending txs. I'm looking for an experienced programmer who has already created something similar. THIS IS IMPORTANT: If you have experience in developing such bots, when you contact me please send proof of your work (videos, transaction records) and your pricing for a project like this.

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    We are seeking a skilled blockchain developer to create a custom TRON (TRX) token that incorporates a range of advanced features and functionalities. The ideal candidate will have experience with TRON blockchain development and a deep understanding of smart contract programming. Features Required: Mintable: The token should be capable of creating new tokens to be added to the total supply. Burnable: It should allow tokens to be "burned", effectively removing them from the total supply. Pausable: The contract should enable transactions to be paused, a crucial feature for emergency or maintenance purposes. Permit: Implementing EIP-2612 permit function for allowing spending of tokens via signatures. Flash Minting: Ability to mint tokens temporarily within a transaction without per...

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    I am seeking an experienced blockchain developer with strong knowledge in BSC Smart Contracts to help me build an engaging affiliate program. This project requires a robust strategy to increase user adoption and revenue. The main goal will be community building to drive user adoption. While the specific strategy was not provided in the brief, potentially effective methods could include social media engagement, forums, and events. Therefore, the ideal candidate should have: -A proven track record in creating successful affiliate programs -Proficient in social media engagement and creating online forums -Experience in hosting digital events and meetups I need someone who can begin immediately and the turnaround time should be prompt, as the completion of this project is ASAP.

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    We are seeking a skilled blockchain developer to create a custom TRON (TRX) token that incorporates a range of advanced features and functionalities. The ideal candidate will have experience with TRON blockchain development and a deep understanding of smart contract programming. Features Required: Mintable: The token should be capable of creating new tokens to be added to the total supply. Burnable: It should allow tokens to be "burned", effectively removing them from the total supply. Pausable: The contract should enable transactions to be paused, a crucial feature for emergency or maintenance purposes. Permit: Implementing EIP-2612 permit function for allowing spending of tokens via signatures. Flash Minting: Ability to mint tokens temporarily within a transaction without per...

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    I am in need of an expert to develop an affiliate program on the Binance Smart Chain (BSC) platform. The key function of this program is to facilitate a multi-level marketing system with a depth of 10 levels. Key Features: - Multi-Level Marketing: The system must support a network of affiliates up to 10 levels deep. Ideal Candidate: - Deep understanding of Smart Contracts within the Binance Smart Chain ecosystem. - Proven experience in creating multi-level marketing systems. - Able to deliver within a reasonable timeframe.

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    I've successfully created an ERC-20 token on the Ethereum network, utilizing the OpenZeppelin Contracts Wizard and the Remix IDE for its development. The token is live, but I'm encountering issues with its representation on Etherscan.io. Specifically, I'm facing challenges with the ABI details and updating the token's image on Etherscan. It seems there's a mismatch or an incorrect setup that's preventing these elements from being correctly recognized or displayed. I'm looking for an Ethereum and Etherscan expert who can: Quickly diagnose the issue with the ABI and token image update on Etherscan. Provide a detailed solution and assistance in implementing the necessary adjustments to resolve these issues. Advise on best practices for token management an...

    $40 (Avg Bid)
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    I've successfully created an ERC-20 token on the Ethereum network, utilizing the OpenZeppelin Contracts Wizard and the Remix IDE for its development. The token is live, but I'm encountering issues with its representation on Etherscan.io. Specifically, I'm facing challenges with the ABI details and updating the token's image on Etherscan. It seems there's a mismatch or an incorrect setup that's preventing these elements from being correctly recognized or displayed. I'm looking for an Ethereum and Etherscan expert who can: Quickly diagnose the issue with the ABI and token image update on Etherscan. Provide a detailed solution and assistance in implementing the necessary adjustments to resolve these issues. Advise on best practices for token management an...

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    Description: We are seeking a skilled and reliable Ethereum developer to create a custom ERC-20 token for our project. The ideal candidate should have a strong background in blockchain technology, smart contract development, and Ethereum standards. Requirements: Proven experience in developing and deploying smart contracts on the Ethereum network. Expertise in Solidity programming language. Familiarity with ERC-20 token standards and best practices in token development. Ability to work closely with our team to understand our specific needs and implement them effectively. Strong communication skills and adherence to project deadlines. Project Scope: Design and development of a custom ERC-20 token. Deployment of the token smart contract on the Ethereum network. Integration guidance and su...

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    I am looking for an experienced developer with strong proficiency in Solidity. The project involves creating a smart contract on the Binance Smart Chain to manage an affiliate marketing program with more than 3 levels of commission. Key Requirements: - Proficiency in Solidity and experience with Binance Smart Chain - Prior experience with creating smart contracts for affiliate marketing programs - Ability to handle multi-level commission structures Additional Features: - Knowledge of creating web interfaces for managing and viewing affiliate programs Ideal Candidate: - Proven track record of successful smart contract development - Strong communication skills for regular updates and feedback - Ability to meet deadlines and deliver high-quality work - Experience with affiliate marketing p...

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    I need someone with blockchain knowledge to identify and resolve some issues related to the blockchain in a dapp.

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    I am looking for someone to work with long term if this gets delivered well **Please dont send a generic pitch. I would appreciate it if you show me similar work you have done in building a wallet tracker** Develop a wallet tracker, for Base and Solana, with features including real-time transaction monitoring, customizable notifications, and intuitive, user-friendly transaction summaries. I prefer to repurpose an existing open-source project or leveraging a project you have already worked on rather than starting from scratch. Key Features: 1. Real-time monitoring of wallet transactions. (10 secs refresh) 2. Customizable alerts based on user-defined criteria. 3. Simplified transaction descriptions in plain language. 4. wallet labelling Access will be provided on Discord, so experienc...

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    Title: Mid-Level Smart Contract and Backend Developer Job Description: We are seeking a talented and experienced Mid-Level Smart Contract and Backend Developer with expertise in , , Solidity, Node.js, Hardhat, and Foundry to join our dynamic team. As a key member of our blockchain development team, you will be responsible for designing, implementing, and maintaining smart contracts and backend systems to support our decentralized applications (dApps) and blockchain-based solutions. Responsibilities: Develop and deploy smart contracts on EVM blockchain platforms, ensuring security, efficiency, and reliability. Collaborate with the frontend development team to integrate smart contracts with user interfaces and ensure seamless user experiences. Design and implement backend systems using N...

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    EL bot debe poder operar en varios DEX usando flashloans como caracteristica pricipal, las oportunidades de las transacciones las debe buscar en los mempool de los contratos inteligentes de cada DEX. Tambien debe poder hacer frontrunning de las transsacciones The bot must can operate on many DEX using flashloans like principal function, the oportunities of transaction have to look for in the mempool of the Contratcs of the DEX. must can do frontrunning,and sandwich attack

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