Hire the Best Blockchain Developers
Calgary, Canada
10 years of progressive work experience in software development and product management in the fintech industry. Interested in AI and Web3 projects. I design and build AI-powered applications. Hold Bachelor's degree in Computer Science. Live in Calgary, Canada. โข AI: Google AI Studio, Gemini API, Imagen for generative image pipelines, Anthropic Claude API, OpenAI API for LLM integration, prompt engineering, AI-powered product development โข AI-Assisted Dev Tools: Claude Code, GitHub Copilot, Codex โข Web3: Solidity, Foundry, Web3.js/Ether.js, ERC-20, ERC-721, EVM, dApps, DeFi, NFT, Blockchain APIs โข Languages: HTML/CSS, JavaScript, TypeScript, JSON, PHP, MySQL, PostgreSQL, Python โข Developer Tools: Next.js, Git, Figma, Jira, Trello, Scrum, Cloudflare, Azure, Visual Studio Code
- Blockchain
- Blockchain Architecture
- Digital Concourse Marketing Automation
- AI Bot
- AI Agent Development
- AI Content Creation
- AI Implementation
- AI App Development
- AI Consulting
- AI Instruction
- Smart Contract
- Web3
- Cryptocurrency
- Ethereum
- Blockchain, NFT & Cryptocurrency
- Solidity
- DApp Development
- Layer 2 Blockchain
- Bitcoin
Lagos Island, Nigeria
I hired Kehinde a year ago for a small WordPress task to test out his skills, And oh boy did he deliver. In fact so much i have trusted him with all the development of my startup - Founder, wellnessplus. Fullstack developer, Telegram Bot, Blockchain project manager & developer, Blockchain Game developer, Fullstack blockchain & smart contract Dapp engineer & auditor. I am an excellent and passionate MERN full stack block chain developer. โ Skills & tooling: ๐Front-end ๐ โ React.js, Redux, Zustand โ TypeScript โ Styled-component, Tailwindcss โ Material UI, Ant Design, BootStrap, HTML, CSS, Canvas โ Wordpress ๐Back-end ๐ โ JavaScript - Node.js, Express.js โ PHP - Laravel, WordPress โ TypeScript โ MySQL & MongoDB - Prisma โ Telegram bot โ Wordpress ๐Blockchain๐ โ Swap, Liquidity, Staking, Farming, bridge forking Pancakeswap, Uniswap โ Solidity, blockchain game โ Smart Contract, Token, NFT, ERC20, BEP20, TRC20, ERC721, ERC1155, EIP2535, Upgradeable smart contract โ Blockchain monitor โ Web3.js, ethers.js, Hardhat, Mocha, Chai, Brownie โ Wordpress โ ๐๐ซ๐จ๐๐๐ฌ๐ฌ๐ข๐จ๐ง๐๐ฅ ๐๐๐ซ๐ฏ๐ข๐๐๐ฌ ๐๐๐๐๐ซ๐๐: โ Presale Launchpad Development โ Decentralized Applications (dApps) Initial DEX Offerings (IDO) | Initial Coin Offerings (ICO) | Security Token Offerings (STO) โ Smart Contract Development, testing & Auditing โ NFT Minting & Marketplace Solutions โ Tokenization & Digitization of real-life asset - custom ERC20, ERC721, ERC1155 โ Tokenized & Digitization of Real Estate Platforms โ DeFi Applications โ Staking & Lending Platforms โ Yield Farming Protocols & Liquidity Mining Solutions โ Decentralized Exchanges (DEX) & Centralized Crypto Exchange Development โ Advanced Trading Platforms โ Governance Token Solutions & DAO(Decentralized autonomous organization) โ Peer-to-Peer (P2P) Lending & Borrowing Protocols โ Proficient in Hardhat for deploying & managing blockchain applications across Ethereum test & production environments โ Tokenomics Design & Strategy โ Development of Decentralized Autonomous Organizations (DAOs) โ Exchange Development (CEX | DEX) โ Blockchain Whitepaper Writing โ Trading Bot Development โ Telegram Bot Development โ Wordpress development ๐ Security & Sustainability: I prioritize building secure & reliable solutions designed to stand the test of time. Your peace of mind is always my top priority. โจ Why Choose Me? I go beyond delivering solutionsโI build lasting partnerships. Driven by a passion for innovation and a commitment to excellence, I help my clients succeed in the digital age. Letโs turn your vision into something extraordinary. Contact me today, and letโs bring your ideas to life!
- Blockchain
- Blockchain Development
- Blockchain, NFT & Cryptocurrency
- Solidity
- Web3
- React
- Ethereum
- Ethers.js
- ExpressJS
- Node.js
- JavaScript
- NFT
- DApp Development
- Full-Stack Development
- Smart Contract
London, United Kingdom
Need a secure, high performance DeFi protocol, custom bot, or trading terminal built on Solana? I am a London based Web3 developer specializing in the Solana ecosystem. I don't just write basic smart contracts; I build complete, production ready dApps from the ground up. In the DeFi space, security vulnerabilities and latency can kill a project. My focus is entirely on writing extremely responsive, optimized code that executes exactly as intended. My core tech stack and capabilities include: โข Blockchain: Solana, Anchor Framework, Rust โข Frontend & Integration: React, Next.js, TypeScript, Web3.js โข Specialties: Custom DEX interfaces, Token Launchpads, Trading Terminals, and Automated Bots โข Licenses: TradingView Advanced Charting Library. I already have a proven track record of building complex infrastructure. Please review my portfolio below to see real examples of my work, including the Nexline Trading Terminal and the Meow Protocol Launchpad. If you have clear technical requirements and are ready to start building, send me a message with your project details and let's discuss the architecture.
- Blockchain
- Solana
- Smart Contract
- Crypto Exchange Platform
New York, New York
My specialty and proven track record is enabling founders to go from idea to production rapidly using an AI-driven, agentic software development process built around the following AI-centric pipeline: Discovery โ AI Transcription โ AI-Optimized Spec โ Test-first Development โ AI and Human Code Review โ Iterative Delivery โ Production Claude Cowork was written in 10 days utilizing this process. My background: Iโm a US based Fractional CTO & Software Architect with 20+ years of experience leading startups to funding. This combined with extensive experience leading mission-critical initiatives at large organizations like The Federal Reserve and Fannie Mae. I work best with founders who want to move fast, stay lean, and get to a real, working product without unnecessary complexity. Let's build something great.
- Blockchain Architecture
- AI Agent Development
- LLM Prompt Engineering
- AI App Development
- Blockchain Development
- Web3
- Serverless Computing
- Serverless Stack
- Solution Architecture
- Next.js
- NestJS
- Flutter
- Vector Database
- Vector Embedding
- Retrieval Augmented Generation
Narayanganj, Bangladesh
Want to work with an experienced Blockchain developer who can bring your smart contract, decentralized application (dApp) vision to life? Are you looking for a Solidity or Rust developer to develop "Gas-Optimized" smart contracts? Whether you're looking to create ERC20 or SPL tokens, ERC721, ERC1155, or NFTs with custom features, concerned about vulnerabilities and exploits in your high-value contracts, need to write tests for contracts, or need a script to interact with leading DEX protocolsโI've got you covered. ๐ Some of my previous clients' quotes about me: โ๏ธ "...Excellent technical skills and consistently good communication... Completed the project in a timely fashion, exceeding our original deadline." โ๏ธ "His work was phenomenal...made sure I understood every step along the way... โ๏ธ "..took this project on as if it was his own... Great professional skills, always there to answer questions and suggest the best solutions." โ๏ธ "...Every facet of his work was impressive. WOW!" โ๏ธ "... goes above and beyond. Md's professionalism and expertise in blockchain are unmatched.." โ๏ธ "... communication is excellent, delivery is fast, and his knowledge of smart contracts is impressive." With expertise in EVM-compatible chains (like Ethereum, BSC) and Solana, I specialize in delivering high-performance, gas-optimized smart contracts and dApps tailored to your specific requirements. I help my clients build secure and highly resilient smart contracts, minimizing vulnerabilities and ensuring your code is fortified against exploits. I might be the perfect fit if you're thinking of any of these: โ "I need the BEST developer who's as passionate about my success as his own." โ "I want someone who will walk me through every step of smart contract interaction." โ "Gas fees are too high! My smart contract needs to be lightning-fast and cost-efficient." โ "I know blockchain, but I need a professional to make my smart contracts 100% secure." โ "Iโm not an Ethereum or Solana expert, and I donโt have time to mess around with dApps." โ "Our last dApp was a disasterโI canโt afford to let that happen again." โ "I need an EVM-compatible blockchain or Solana expert to cover all my bases for cross-chain or multi-chain applications." Working with me, you will: ๐ Gain access to a developer skilled in Python, JavaScript, TypeScript, Rust, Solidity, Brownie, Hardhat, NextJS, Foundry, and Anchor. ๐Eliminate vulnerabilities and reduce gas fees during both deployment and interactions. ๐ Maximize your DApp's security with continuous follow-ups for improvements. ๐ Save time and resourcesโyou wonโt need to hire separate back-end, front-end, Rust, or Solidity developers because I handle it all as a full-stack developer. ๐ Receive custom scripts to swap, add, or remove liquidity, lend, deposit, borrow, withdraw, and interact across top dApp protocols. ๐ Optimize for multi-chain functionalityโWhether you need to bridge Ethereum, BSC, or Solana, I can create solutions that integrate seamlessly across multiple networks. ๐ My Skills & Expertise in Blockchain: โ๏ธSolidity Development for EVM-compatible smart contracts โ๏ธRust Development for Solana Blockchain โ๏ธExperience with Chainlink, various ERC standards, and OpenZeppelin โ๏ธToken development(ERC20/BEP20/SPL) with features like Mintable, Burnable, Reflections, TxFee, Whitelist/Blacklist, and IDO/ICO for tokens. โ๏ธNFTs (ERC721, ERC1155, ERC404, etc) with Whitelist, Royalties, Presale, Public Sale, Dutch Auctions, IPFS Hosting, and Dynamic NFTs โ๏ธFull-stack Blockchain Developer with expertise in Solidity, Python (Brownie), JavaScript (Hardhat), Typescript, Rust(Anchor), NextJS, and Foundry. โ๏ธScript/Program Development for deploying/interacting with smart contracts and protocols like Aave, Uniswap, Raydium, and PancakeSwap. Why Work With Me: ๐Extensive Experience: I've designed and built hundreds of smart contracts from scratch, creating robust back-end scripts for deployment. ๐Expert Problem Solver: Proficient in designing projects from the ground up, solving complex problems, and rapid iterative prototyping. ๐Gas Optimization Strategies: I use professional strategies to optimize smart contracts for minimal gas fees and thoroughly test them to identify and prevent potential exploits. My Background in Numbers: โ๏ธ Over 3 years of experience with Blockchain technology. โ๏ธ Developed numerous DApps and scripts for protocols and tokens, including ERC20, BEP20, SPL, ERC721, and ERC1155. โ๏ธ Worked on several growing DApp projects, such as Crowdfunding platforms, Airdrop systems, DEXs, insurance, ICO, IDO, Tokens, Lottery, and NFT marketplaces. โ๏ธ Created a variety of smart contracts. โ๏ธ Wrote extensive test scripts for smart contracts using Foundry, Hardhat, and Anchor. Sound Like a Fit? Next Steps: Click the green "Invite to Job" button in the top right-hand corner or send me a message, and letโs schedule a call to discuss your project! Otherwise, feel free to book a consultation!
- Blockchain
- JavaScript
- Solidity
- web3.js
- Ethereum
- Smart Contract
- Blockchain Development
- DApp Development
- Cryptocurrency
- Next.js
- Blockchain, NFT & Cryptocurrency
- Smart Contract Development
- Solana
- Rust
- Blockchain Tokenization
Lalru, India
Blockchain is easy to pitch. Building something people actually use is where things get interesting. Over the last 10+ years, I've worked across software engineering, product development, and blockchain infrastructure, helping startups and businesses turn ideas into working products. A large part of my recent work has focused on: โข Carbon Credit Tokenization โข Real Estate Tokenization โข RWA (Real World Asset) Platforms โข Smart Contracts โข DeFi Applications โข Web3 Products โข Exchange & Trading Infrastructure I've worked on projects ranging from token ecosystems and blockchain integrations to SaaS platforms, backend systems, automation tools, and customer-facing applications. One thing I've learned over the years is that most projects don't fail because of technology. They fail because requirements aren't clear, complexity gets out of control, or important technical decisions are postponed until they become expensive. That's usually where I get involved. Sometimes it's a new product. Sometimes it's an existing platform that needs to scale. Sometimes it's a project that's been through multiple developers and needs a practical way forward. What I Can Help With: Asset Tokenization & RWA โ Carbon Credit Platforms โ Real Estate Tokenization โ Fractional Ownership Models โ Asset-Backed Token Solutions โ Investor Portals โ RWA Infrastructure Blockchain & Web3 โ Smart Contract Development โ ERC20 / BEP20 Tokens โ Wallet Integrations โ dApps โ DeFi Platforms โ NFT Infrastructure โ Web3 Integrations โ Staking & Reward Systems Exchange & Trading Systems โ Crypto Exchanges โ Matching Engine Integrations โ Trading Platforms โ Wallet Management โ Payment Processing Software Engineering โ SaaS Platforms โ Backend Systems & APIs โ AI Integrations โ Automation Solutions โ Cloud Infrastructure โ System Architecture โ Database Design & Optimization Technology Stack Blockchain: Solidity, Ethereum, Web3, DeFi, ERC20, BEP20, Tokenization, RWA Infrastructure Backend: Node.js, TypeScript, PHP, Laravel, Python, REST APIs, GraphQL, Microservices Frontend: React, Next.js, JavaScript Infrastructure: AWS, Docker, Linux, CI/CD Databases: PostgreSQL, MySQL, MongoDB, Redis Clients Usually Reach Out When โข They need an RWA or tokenization platform built correctly from the start โข A blockchain product needs experienced technical leadership โข Smart contracts require implementation or integration โข Existing systems need blockchain functionality โข Development has slowed down and technical direction is unclear โข An MVP needs to become a production-ready product โข They need someone who can take ownership rather than simply complete tasks If you're building something in blockchain, tokenization, Web3, or adjacent technologies and need someone who can contribute beyond implementation, I'd be happy to discuss it.
- Blockchain
- Blockchain Architecture
- Smart Contract
- web3.js
- Solana
- DApps
- Crypto Wallet
- Solidity
- NFT Marketplace
- DeFi
- Web Development
- Rust
- Python
- React
- Ethereum
- Node.js
- JavaScript
- Bitcoin
- API
- Graphic Design
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Resources to help you hire

Cost to hire a Blockchain Developer
Explore typical Blockchain Developer rates and what businesses pay to hire top talent.

Blockchain Developer job description template
Get tips to write a job post that attracts qualified Blockchain Developers.

Blockchain Developer interview questions
Top interview questions to help you hire the right Blockchain Developers, faster.
Resources to help you hire

Cost to hire a Blockchain Developer
Explore typical Blockchain Developer rates and what businesses pay to hire top talent.

Blockchain Developer job description template
Get tips to write a job post that attracts qualified Blockchain Developers.

Blockchain Developer interview questions
Top interview questions to help you hire the right Blockchain Developers, faster.
Blockchain developer hiring guide
Blockchain developers design and build secure, decentralized systems that power everything from smart contracts and DeFi platforms to supply chain solutions and NFT marketplaces. Businesses hire blockchain developers to translate complex distributed ledger concepts into production-ready applications, reduce reliance on intermediaries, and create tamper-resistant digital workflows.
What does a blockchain developer do?
A blockchain developer builds and maintains decentralized software systems that leverage blockchain technology to deliver secure, transparent, and tamper-resistant applications. Their expertise in cryptography, consensus mechanisms, and smart contract languages helps organizations unlock operational efficiencies and new revenue streams that traditional architectures cannot support.
Here's what a blockchain developer typically does and how they add value:
Develop decentralized applications (dApps). Build front and back ends for apps running on blockchain networks using frameworks and libraries like web3.js, React.js, or Node.js
Smart contract development. Write, test, and deploy smart contracts using languages like Solidity or Rust to automate transactions and protocols on platforms like Ethereum
Integrate APIs and blockchain networks. Connect blockchain systems with external systems and APIs to support functions like cryptocurrency wallets, token standards, and consensus algorithms
Performance and security optimization. Implement cryptography, secure coding practices, and efficient algorithms to harden blockchain systems against vulnerabilities
Cross-functional collaboration. Work closely with full-stack developers, DevOps teams, and project managers to align blockchain system designs with product requirements
How to hire a blockchain developer on Upwork
Hiring a blockchain developer on Upwork involves more than just finding someone with technical skills; it's about aligning your specific project needs with the right expertise. From crafting your job post to onboarding your freelancer, following this structured process helps ensure a successful engagement.
Step 1: Post your project
The quality of your job post directly influences the caliber of blockchain developers who respond. Being specific about your technical requirements and project scope helps filter out unqualified candidates early and attracts professionals with relevant expertise.
Review Upworkโs blockchain developer job description template for ideas on content and format.
Outline specific deliverables such as dApps, smart contracts, or API integrations along with the tech stack you need (e.g., Solidity, Python, JavaScript, Hyperledger).
Specify blockchain platforms (Ethereum, Polygon, Solana) and relevant experience requirements to attract proposals from developers with matching expertise.
For a faster start, try the Job Post Generator, powered by Umaโข, Upwork's Mindful AI. Describe what you need in a few sentences and Uma will draft a job post tailored for blockchain developers.
Step 2: Review proposals
Carefully assessing each proposal allows you to identify candidates whose technical backgrounds and project histories align with your specific blockchain requirements. Focus on evidence of hands-on experience rather than general claims of expertise.
Once proposals arrive, prioritize candidates who demonstrate verified experience in blockchain projects and relevant tech stack proficiency.
Compare freelancer portfolios and client feedback to evaluate real-world blockchain projects they've delivered, such as deployed smart contracts or live dApps.
Look for demonstrated proficiency in key languages like Solidity, Rust, Python, and JavaScript (Node.js/React.js), as well as frameworks like Hardhat or Truffle.
Check for relevant certifications, GitHub contributions, or participation in blockchain hackathons that signal deep domain knowledge.
Review Upwork Job Success Scores, talent badges, and customer feedback.
You can use Upworkโs instant video interviews to screen applicants for a best-fit shortlist, with Uma providing side-by-side candidate comparisons.
Step 3: Conduct interviews
The interview stage provides an opportunity to assess how candidates think through complex blockchain challenges and communicate technical concepts. This step is essential for determining whether a developer's working style and expertise match your project's unique demands.
Interviewing top candidates helps you evaluate their problem-solving approach, past blockchain development work, and alignment with your preferred tools and frameworks.
Use a structured interview approach and try blockchain developer interview questions to assess both technical depth and communication skills.
Ask about specific experience with smart contract development, decentralized systems, and tooling like Truffle, Hardhat, or web3.js.
Pose a scenario-based question related to your project to gauge how they approach architecture decisions and security considerations.
Upwork Messages allows you to schedule and conduct live video interviews on the platform, with call transcripts and summaries available after the calls.
Step 4: Hire and collaborate
A successful blockchain engagement depends on establishing clear processes and expectations from day one. Setting up the right collaboration framework ensures both parties stay aligned throughout the development lifecycle.
After selecting your developer, use Upwork's tools to complete a contract, streamline onboarding, define project milestones, and maintain clear communication throughout the engagement.
Establish a shared workflow for version control and testing using tools like GitHub, and align on staging environments or smart contract audit procedures.
Share clear project requirements, expected checkpoints, and preferred communication channels from the outset.
Set up milestone-based payments to track progress and maintain accountability across each development phase.
Upwork is not affiliated with and does not sponsor or endorse any of the tools or services discussed in this article. These tools and services are provided only as potential options, and each reader and company should take the time needed to adequately analyze and determine the tools or services that would best fit their specific needs and situation.
The rates and information provided in this article are based on current data and industry sources available at the time of publication. Freelance rates can vary depending on factors such as experience, location, project scope, and market conditions. Readers are encouraged to conduct their own research to confirm current rates and trends, as this information may change over time.
How much does hiring a blockchain developer cost?
On Upwork, blockchain developers generally charge $30-$59 per hour. Hiring costs vary widely depending on project complexity and the developerโs experience, skill set, and location.
Actual project costs depend on the scope and deliverables involved. Here's a comparison of typical project-based engagements for blockchain development:
Smart contract audit
$500-$3,000 /project
- Security review of existing smart contracts
- Vulnerability report with remediation steps
- Gas optimization recommendations
Crypto wallet integration
$2,000-$7,000 /project
- API-based wallet connect setup
- Multichain wallet support configuration
- Transaction signing and authentication flows
NFT minting platform
$5,000-$15,000 /project
- ERC-721/1155 smart contract deployment
- Minting front-end with metadata management
- Marketplace listing integration
DeFi protocol development
$15,000-$40,000 /project
- Lending, borrowing, or staking smart contracts
- Liquidity pool and tokenomics implementation
- Front-end dashboard with analytics
Enterprise blockchain ecosystem
$40,000-$80,000+ /project
- Full supply chain or data-integrity blockchain
- Cross-chain bridge and interoperability layer
- Stakeholder dashboards with API back end
FAQs about blockchain developers
Frequently asked questions
Is hiring a blockchain developer worth it?
Yes, hiring a blockchain developer is worth it for businesses pursuing secure, transparent, and decentralized solutions across various industries like finance, health care, real estate, and supply chain management. Blockchain technology enables automation through smart contracts, supports tokenization of assets, and enhances system reliability, bringing measurable value that traditional systems can't match.
What types of businesses benefit most from hiring a blockchain developer?
Startups exploring cryptocurrency, DeFi platforms, and NFT marketplaces, enterprises implementing blockchain for supply chain or health care data integrity, and tech firms building web3 ecosystems benefit the most from blockchain expertise. Both small and large organizations benefit when tailored blockchain solutions align with strategic goals.
How long does it take to build a blockchain-based application?
Timelines for building blockchain-based applications vary depending on the project's complexity, tech stack, and team experience. A basic decentralized app (dApp) with limited smart contract logic might take two to four weeks, while more advanced systems can take three to six months or longer.
Key variables include:
Number and complexity of smart contracts
Integration with front-end frameworks and back-end systems
Use of third-party APIs or oracles
Testing, audits, and deployment to mainnet
Required compliance, scalability, or interoperability features
What kind of ongoing maintenance or support will a blockchain-based system need?
After the initial launch, a blockchain-based system typically requires ongoing support for performance, updates, and security. Long-term work may include:
Monitoring and fixing vulnerabilities. Even minor smart contract flaws can lead to major exploits, so regular audits are critical.
Smart contract upgrades. Although many contracts are immutable, some use upgradable proxy patterns that require active management.
Compatibility updates. Ensuring continued integration with evolving tools, wallets, APIs, and blockchain network changes.
Performance optimization. Improving gas efficiency, transaction speed, or back-end performance based on user feedback.
Feature expansion. Adding new modules, such as staking, tokenomics, or cross-chain support, to evolve the system.
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