Hire web3.js developers

Rapidly build blockchain apps. Web3.js devs quickly integrate Ethereum-based solutions—hire now, onboard this week.

Joaquín
Back-end Web Developer
Chile/(GMT -3:00)
A results-oriented full-stack developer equipped with 14+ years of expertise in the industry with a focus on Back-end engineering. Joaquin clearly understands how to use all the Javascript, Typescript and Node.js advantages to boost performance of any project. On top of that, he has a good background in React and overall 6 years of commercial experience with it. He worked with predominantly with blockchain, finance, e-commerce, medicine, retail, and others. Moreover, he appreciates well-coordinated teamwork and teammates motivated by the same goal. Still, solo or as a team member, Joaquin gets the job done.
Experience
18 years
Availability
Part-time
web3.jsTypescriptSolidityJavaScriptReactNode.jsBlockchainBinance smart chainEthereumNFTSmart contractsAWSPythonCryptoDockerSQLGraphQLMySQLRedisPostgreSQLMicroservicesWeb SocketsMongoDBNext.jsAINest.jsAmazon SQSOpenAI APILLaMAPrompt engineeringPlaywrightWebSocketAmazon S3SupabaseVerceln8nCursorGitHub CopilotData ModelingDatabase designGCP
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Peter
Full-stack Web Developer
Cyprus/(GMT -5:00)
Peter is definitely a pro in the field, with 12 years of experience in development under his belt. During this time, he worked as a Tech Lead and even owned the company. He has a solid background in Node.js and Typescript. For the past 2 years, he’s been actively working on blockchain projects using the Solana network, Rust, Ethereum and Solidity. Our tech interviewer was impressed by his skills, and here is what he says about Peter: "He has a lots of blockchain and general coding experience, good points for performance, good points for system architecture. Sounds like a good leader or architect". Moreover, Peter is very mature and wise and knows how to communicate and deal with conflict questions. He is definitely the developer you don't want to overlook.
Experience
15 years
Availability
Part-time
web3.jsNode.jsMongoDBAngularTypescriptEthereumSolanaNATS.ioBinance smart chainNest.jsEthers.jsRustRedisAWSDockerGraphQLDeFiBlockchainDevOpsIonicWordPressJavaScriptMachine learningPythonAIReactMicroservicesDocker Compose.NETWebSocketFlutterReact Native
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Arun
Blockchain Engineer
Malaysia/(GMT +8:00)
Arun is a senior blockchain engineer and CTO with deep expertise in Solidity, EVM architecture, and smart contract security. He has led tokenization, RWA, and stablecoin projects, with strengths in architecture, stakeholder communication, and product-focused delivery. His conceptual and security skills are strong. He is best suited for senior Solidity or technical lead roles in EVM-based projects.
Experience
7 years
Availability
Full-time
web3.jsEthers.jsSmart contractsSolanaSolidityEtherumBlockchainEthereumDeFi
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Dimitar
Full-stack Web Developer
Bulgaria/(GMT +2:00)
Dimitar has years of experience creating a wide variety of products while adapting to the ever-changing needs of modern businesses. This includes everything from building interaction designs to front-end web development, working with frameworks like Angular, React, React Native, Ionic, Node.js, and many others. He is confident in overcoming any challenge he encounters, from concept sketches to pixel-perfect mock-ups and ready-made HTML prototypes. Additionally, Dimitar has experience leading teams, further enhancing his ability to deliver outstanding results.
Experience
15 years
Availability
Full-time
web3.jsNext.jsReact NativeReactNode.jsTypescriptPostgreSQLNest.jsAWSDeFiEthers.jsGraphQLREST APIStorybookPythonAngularStripe APIFlutterJavaScriptExpress.jsFirebaseAmazon S3Amazon RDSAmazon EC2AWS LambdaJavaSpring BootPrismaDockerRedux Toolkit
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Daniel
Full-stack Web Developer
Bulgaria/(GMT +2:00)
Daniel is a senior full-stack engineer with deep expertise in TypeScript, React, and Node.js, and over 18 years of commercial experience. He has delivered production systems in the music industry and built high-performance trading and analytics platforms in the crypto domain, focusing on integration across Solana and EVM chains. His strengths include pragmatic architecture, large-scale data processing, and clear, structured communication. While experienced in Web3 integration, he is not suited for smart contract authorship roles.
Experience
21 years
Availability
Part-time
web3.jsReactTypescriptWeb 3.0Next.jsGCPSolidityNode.jsExpress.jsAI-assisted codingGolangPHPPostgreSQLEthereumKafkaSolanatRPCWordPressLaravelSmart contractsAWSCryptoBigQueryMongoDBKotlinDevOpsApacheBlockchain
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Catalin
Full-stack Web Developer
Romania/(GMT +2:00)
Catalin is a senior full-stack engineer with more than 10 years of experience in the tech world. He has great expertise in cross-platform development using React/React Native, Swift, Node.js, and proficiency in both databases and cloud networks. Having worked in start-ups from all around the world, Catalin knows how to bring value during sprints and impress his colleagues with great soft skills.
Experience
16 years
Availability
Part-time & Full-time
web3.jsSwiftNode.jsReact NativeReactJavaScriptNext.jsHerokuTypescriptMongoDBPostgreSQLFirebaseWebflowJavaSwaggerGraphQLSQLiOSReduxDynamoDBAWS LambdaExpoAIFirebase CrashlyticsMySQLObjective CElasticSearchPythonRedisStripe APIRedux SagaSoliditySmart contractsVue.jsExpress.jsClaude LLMPrompt engineeringLLMBlockchainGPTOpenCVCloudflareAWSMapBoxTurborepoViteOpenAPIOpenAI APITailwind CSSSupabase
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Kevin
Full-stack Web Developer
Albania/(GMT +2:00)
Kevin is an experienced engineer with 7 years of experience building reliable, data-intensive platforms across cloud infrastructure, marketing automation, identity verification, and enterprise resource planning. He specializes in backend architecture, distributed processing, data pipelines, integrations, analytics, and performance optimization, with strong SQL and ORM skills and a pragmatic approach to solving complex product and operational problems. Kevin communicates clearly, adapts well to changing requirements, and has rotational team lead experience while remaining hands-on with development.
Experience
7 years
Availability
Full-time
web3.jsFlaskPythonAWSReactTypescriptRedisSQLCeleryFastAPIPostgreSQLWebSocketViteJavaScriptNode.jsMySQLMariaDBMongoDBDjangoData ScienceNumPyExpress.jsRabbitMQNext.js
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Adrian
Front-end Web Developer
Mexico/(GMT -6:00)
Adrian is a senior blockchain engineer with strong expertise in Solidity and smart contract development, complemented by practical Web3 integration skills. He demonstrates solid understanding of blockchain fundamentals, smart contract security, and architectural decision-making. While his React and TypeScript skills are mid-level, he excels in backend blockchain roles and has experience mentoring and leading teams.
Experience
7 years
Availability
Full-time
web3.jsReactTypescriptSolidityEthers.jsNode.jsPostgreSQLJavaScript.NETJavaXamarinC#REST APIExpress.jsMongoDBJest
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Ilya
Blockchain Engineer
Ukraine/(GMT +2:00)
Ilya is a highly skilled senior blockchain and full-stack developer with 7 years of experience, specializing in React/Node for web development and Polygon, Base, and Solana for blockchain. He has led projects and managed teams, demonstrating both technical and leadership abilities. Ilya's expertise also includes smart contract development, blockchain migrations, and cryptography. Delivering consistent results in fast-paced and flexible software development environments, Ilya will be a valuable addition to any team.
Experience
7 years
Availability
Full-time
web3.jsAWSCI/CDTypescriptNode.jsNext.jsReactSolidityWeb 3.0Docker ComposePostmanSwaggerSupertestJestPrettierESLintDigitalOceanGCPNetlifyVercelGitHub ActionsGitLabGitHubGitDockerSocket.ioGraphQLREST APIOAuthJWTRedisMongooseODMTypeORMPrismaMongoDBPostgreSQLNest.jsViteWebpackMaterial UITailwind CSSReact QueryZustandRedux ToolkitWagmiEthers.jsHardHatTruffleReact NativeSmart contractsSolanaRustStripe APIEthereumNFT
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What you should know about modern web3.js devs

by Nataliia Stasiuk

Recruiter at Lemon.io

Verified Expert

Hiring Guide: Web3.js Developers

Why Hire Web3.js Developers

Web3.js developers specialize in building decentralized applications (dApps) that interact seamlessly with blockchain networks like Ethereum. By hiring skilled Web3.js developers, you can connect your front-end interfaces to smart contracts, manage digital wallets, and enable secure blockchain transactions directly from your web or mobile app. As Web3 technology continues to redefine digital ownership and financial ecosystems, businesses that integrate blockchain functionality can gain early-mover advantages in transparency, automation, and decentralized security.

What Web3.js Developers Do

Web3.js developers use the Web3.js library—a powerful JavaScript framework—to interact with blockchain networks through JSON-RPC APIs. They integrate smart contracts into user interfaces, handle crypto wallet authentication, and ensure smooth data exchange between blockchain nodes and dApp front-ends. Their expertise enables businesses to build DeFi platforms, NFT marketplaces, tokenized ecosystems, and decentralized gaming apps that offer verifiable and trustless digital interactions.

Core Responsibilities of a Web3.js Developer

Build and maintain decentralized applications (dApps) using Web3.js and Ethereum APIs.

Integrate smart contracts with web and mobile applications.

Implement wallet connectivity with MetaMask, WalletConnect, or Ledger.

Develop token-related functionality (ERC-20, ERC-721, ERC-1155 standards).

Optimize blockchain transaction handling for speed and cost efficiency.

Collaborate with blockchain engineers to test, deploy, and interact with smart contracts.

Implement secure data encryption and user authentication mechanisms.

Ensure UI/UX alignment with blockchain operations and gas fee tracking.

Essential Technical Skills

Languages & Frameworks: JavaScript, TypeScript, Node.js, React, Next.js, Vue.js.

Blockchain Platforms: Ethereum, Polygon, Binance Smart Chain, Avalanche, Solana.

Smart Contract Tools: Solidity, Hardhat, Truffle, Remix IDE.

Wallet Integration: MetaMask, WalletConnect, Coinbase Wallet, Trezor, Ledger.

Data & APIs: Infura, Alchemy, Moralis, The Graph.

Security: Cryptography, private key management, audit awareness.

Version Control & CI/CD: Git, Docker, GitHub Actions, Jenkins.

Soft Skills: Problem-solving, attention to security, and understanding of blockchain economics.

When to Hire Web3.js Developers

Your company is developing blockchain-based applications or integrating Web3 functionality into existing systems.

You’re launching a DeFi or NFT platform that requires real-time smart contract interaction.

You want to enable crypto payments or digital wallet authentication in your app.

Your project needs blockchain event listeners and on-chain/off-chain data synchronization.

You’re building decentralized identity (DID) or DAO applications.

Best Practices for Hiring Web3.js Developers

Evaluate blockchain fundamentals: Candidates should understand Ethereum architecture, gas optimization, and transaction flow.

Check smart contract knowledge: Developers should have experience integrating Solidity contracts using Web3.js or ethers.js.

Assess cryptographic proficiency: Ensure understanding of encryption, key pairs, and wallet security.

Review project experience: Look for developers who have built live dApps or contributed to open-source Web3 projects.

Prioritize performance optimization: Skilled developers should know how to minimize gas costs and handle blockchain latency effectively.

Sample Interview Questions for Web3.js Developers

“What’s the difference between Web3.js and ethers.js?”

“Explain how to connect a React app to Ethereum using Web3.js.”

“How do you handle gas estimation and transaction fees in Web3.js?”

“Can you describe the process of signing and sending transactions?”

“What are common security risks when building dApps and how do you mitigate them?”

“How do you fetch blockchain events and update the UI in real-time?”

Architecture & Optimization Tips

Use Infura or Alchemy nodes for reliable blockchain communication without maintaining your own node.

Implement websocket connections for real-time blockchain event tracking.

Leverage ethers.js alongside Web3.js for modern syntax and improved security.

Cache blockchain data off-chain to improve app responsiveness.

Adopt IPFS or Filecoin for decentralized file storage and NFT metadata.

Hire Blockchain Developers

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CTA

Want to build a decentralized app or Web3-powered platform?
Hire top-tier Web3.js developers from Lemon.io to create secure, scalable, and user-friendly blockchain applications that drive innovation.

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FAQ

What is Web3.js used for?: Web3.js is a JavaScript library that allows developers to interact with blockchain networks like Ethereum, enabling dApps to read and write blockchain data and execute smart contracts.
How is Web3.js different from traditional web development?: Unlike traditional web development, Web3.js enables interaction with decentralized ledgers, smart contracts, and wallets instead of centralized servers or databases.
Which blockchain networks support Web3.js?: Web3.js primarily supports Ethereum and compatible EVM-based networks like Polygon, Avalanche, and Binance Smart Chain.
Do I need to run my own blockchain node to use Web3.js?: No. You can connect to remote nodes using providers such as Infura, Alchemy, or QuickNode for easy access to blockchain data and transactions.

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Why hire web3.js

Over 6500 companies use web3.js as their main framework, including giants like Google, Amazon and Lyft.

High-quality web apps

web3.js's modular approach lets devs reuse components, so they can seamlessly manage app complexity.

Faster development process

web3.js's architecture and a vast library of pre-built components speed up development, so you can get to market sooner.

Enjoyable user experience

From smooth, responsive interfaces to reduced loading times, devs can use web3.js to boost usability.

Scaling made easy

web3.js's modular, component-based architecture makes it easy to scale applications as traffic grows.

Case studies

Aerospace

The experience with Lemon.io has been fantastic. The interview process has been good, the caliber of people – excellent and integration has been very smooth.

Marc HorowitzCOO of SkyFi

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Telecommunications

We needed extra developers to clean off all these bugs so the company could skyrocket.

Conor MackenDirector of Engineering

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We needed extra AI engineers to keep our ambitious project running.

Mike LukimanFounding Senior Software Engineer at Everstar.ai

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Frequently asked questions

You can find Web3.js developers on job boards, freelance platforms, and online developer communities. You may also go to blockchain-related specialist forums, reach out to recruitment agencies focused on tech talent, or network at blockchain conferences and meetups to meet proficient Web3.js developers. On the other side, an independent candidate search is very time-consuming. However, seeking a developer on one’s own requires too much time: reviewing candidate qualifications, skills assessment, and conducting interviews are all too long procedures. If you are searching for a quick solution, then try Lemon.io. We’ll introduce you to pre-vetted Web3.js developers whose soft and hard skills perfectly fit your needs and set up a few calls for you to meet in person.

Onboard Web3.js developers at Lemon.io and get up to 20 hours of no-risk paid trial work. That’s just perfect for checking that the developer’s skills perfectly match your technical requirements and that everything is going smoothly. If satisfied, you can further work with the developer by signing up for a subscription. In case of unsatisfactory results, which is an unlikely case, we will help you find a new Web3.js developer that best fits the needs of your project.

Yes, there is a high demand for Web3.js developers. The demand for Web3.js developers is high due to blockchain technology’s and decentralized applications’ phenomenal popularity. Web3.js is a fundamental library for any interaction with the Ethereum blockchain that powers many dApps, DeFi projects, and NFTs. More and more businesses and startups are exploring blockchain solutions to bring greater security, transparency, and decentralization to many industries, from finance to supply chain management. This growing interest in blockchain technology increases the demand for skilled Web3.js developers who can create and manage smart contracts, integrate blockchain functionality into applications, and assure precise operation within a decentralized ecosystem.

Lemon.io will connect you with the best Web3.js developer in a week. Our matching process is lightning-fast. You’ll get the top, hand-picked candidates in a day or two. We will then set up several calls with the candidates that interest you the most. Our developers have been pre-screened by our expert recruiters and technical professionals. Our rigorous vetting process includes reviewing resumes, checking soft skills, technical evaluation, and only coding tests when necessary. This ensures that we showcase only the best and most reliable developers.

One of the main strengths of Lemon.io is smooth and fast matching procedures. We manually search for a developer according to the tech stack, skills, and expectations of your project to find the right fit. We connect you with 1-2 perfectly matched candidates from our pool of top 1% vetted talent. These developers have undergone a few thorough checks: a resume review, a screening call, and a technical interview. The developers have 4+ years of experience and pass scrupulous vetting, which includes profile completion, a screening call, and a technical interview. Besides, we have an option for subscription or direct hire and give a no-risk trial period of up to 20 hours. You may further collaborate with the developer by signing up for a subscription if you are satisfied with his work. Otherwise, in the extremely rare circumstances of an unforeseen scenario, we will pair you with another developer.

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