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 23,135 reviews, clients rate our Solidity Experts 4.86 out of 5 stars.
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    23 jobs found, pricing in NZD

    I'm in need of someone who can create a small college project based on blockchain technology. I'll provide the codes and other stuffs required. The person just needs to debug some errors and do some front end and back end work. Key Requirements: - Capable of using Remix, CSS, and Java Script for the project. - Understanding of blockchain fundamentals, including user authentication, data encryption, and smart contracts. Please feel free to share your past work and experience related to blockchain, along with any detailed project proposals you might have.

    $12 (Avg Bid)
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    I'm in need of an experienced blockchain developer who can create a dapp and smart contract for a NFT project based on the Ethereum network. The focus of the project will be collectibles NFTs. I would also need a marketplace system integrated within the project to facilitate the selling of these NFTs. Required skills and experience: - Proficient in Ethereum blockchain development - Experience in NFT technology, particularly for Collectibles - Proven track record in creating dapps and smart contracts - Knowledge of creating NFT marketplace Your main tasks will include: - Developing a smart contract - Building a dapp - Implementing a NFT marketplace for collectibles Ideally, you have successfully completed similar projects in the past. Please provide samples or references whe...

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    I am looking for a skilled professional conversant with Cosmos SDK and Solana blockchain platforms. Your primary roles will entail: - Building smart contracts - Setting up blockchain nodes - Implementing critical security protocols The ultimate goal is to develop a stellar decentralized application (dApp). An ideal candidate should have extensive experience in Cosmos SDK, Solana, and proven track record in dApp creation. Understanding of blockchain security protocols is a must.

    $915 (Avg Bid)
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    Need solidity developer 5 days left
    VERIFIED

    Need solidity developer for contract basis .. exp 3+ needed

    $22 / hr (Avg Bid)
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    I'm seeking an experienced blockchain developer to create an Ethereum based ERC-20 token, with unique features of a private pre-sale and a vesting period. Key Responsibilities: - Develop an Ethereum ERC-20 token from scratch. - Implement a private pre-sale phase for initial investors. - Set up a vesting period for token distribution to prevent immediate selling off. Ideal expertise and skills: - Extensive experience in Ethereum blockchain and ERC-20 tokens. - Familiarity with smart contract security, specifically the implementation of a private pre-sale and vesting period. - Ability to create custom functionality beyond standard ERC-20 token framework. For this project, using typical smart contract security method like OpenZeppelin or Consensys Due Diligence is not preferred. ...

    $36 (Avg Bid)
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    I am seeking a developer to create a tool that can calculate the profit and loss (PnL) for any given Ethereum wallet address. The tool should be able to determine the total number of coins bought, as well as calculate the profit and loss from all transactions associated with the wallet. Key Features: Wallet Address Input: Users should be able to input any Ethereum wallet address. Transaction Analysis: The tool should analyze all transactions associated with the provided wallet address. Profit and Loss Calculation: Calculate the total number of coins bought and the profit and loss incurred from all transactions. User-Friendly Interface: The tool should have a user-friendly interface for ease of use. Skills Required: Proficiency in Ethereum blockchain technology. Experience in cryptocurre...

    $73 (Avg Bid)
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    I'm in need of a skilled developer who can create a custom module for the Cosmos SDK. This module will be focused on token creation. As I've never worked with the Cosmos SDK before, I require someone who is not only familiar with it but also has a strong grasp of blockchain development and tokenomics. Key Requirements: - Development of a custom module for the Cosmos SDK - Focus on token creation - Expertise in Cosmos SDK and blockchain development The successful candidate will need to be able to understand the project requirements, propose solutions, and implement them effectively. Strong communication skills are essential, as is the ability to work independently and proactively. A proven track record in blockchain development and previous experience with the Cosmos SDK are hig...

    $918 (Avg Bid)
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    As a blockchain expert, I am looking for a seasoned developer with specific experience in developing on the Cosmos SDK. My goal is to create a new blockchain, incorporating smart contracts functionality and custom token creation. Ideal Skills: - Strong background in blockchain technology, particularly in the Cosmos SDK - Proficient in developing custom tokens and smart contracts - Proven experience in creating new blockchains - Familiarity with decentralised applications is a plus You need to have a good understanding of blockchain concepts, and have a portfolio that demonstrates your ability to handle similar projects. Please provide a brief overview of your previous experience with Cosmos SDK and new blockchain development in your bid.

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    I'm seeking a seasoned developer with extensive experience in the Cosmos SDK. The project entails a range of tasks including wallet integration, blockchain development and smart contract deployment. Your primary focus will be ensuring these are seamlessly integrated into the platform. Key Responsibilities: - Implement Wallet Integration: You must have a thorough understanding of how to integrate wallet services into the Cosmos SDK. - Develop Blockchain: Experience in developing blockchains using the Cosmos SDK is essential. You will be responsible for creating a robust and secure blockchain. - Deploy Smart Contracts: Your expertise in deploying smart contracts using the Cosmos SDK will be crucial to this project's success. Deliverables: - Seamless integration of wallet services...

    $942 (Avg Bid)
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    24 bids

    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.

    $828 (Avg Bid)
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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.

    $721 (Avg Bid)
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    I'm looking for a seasoned blockchain expert, particularly one with considerable expertise with custom blockchain development.

    $925 (Avg Bid)
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    57 bids

    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 1 day 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.

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    Need to complete project 1 day 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

    $39 / hr (Avg Bid)
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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...

    $286 (Avg Bid)
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    8 bids

    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...

    $767 (Avg Bid)
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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.

    $26 / hr (Avg Bid)
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    31 bids

    **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...

    $1025 (Avg Bid)
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    95 bids

    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...

    $58 / hr (Avg Bid)
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    88 bids

    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...

    $223 (Avg Bid)
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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

    $253 (Avg Bid)
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