Hire the Top 3% of Smart Contract Developers in 48 Hours

Toptal is a marketplace for top smart contract engineers, developers, experts and coders. CEOs, CTOs, and management at top companies and startups work with Toptal smart contract freelancers to augment their development teams for smart contract development, app development, web development, and other software development projects to achieve their business needs.

Meet Smart Contract Developers in Our Exclusive Network

Featured Talent

John McLaughlin, Smart Contract Coder.

John McLaughlin

Verified Expert in Engineering
21 Years of Experience

Smart Contract Developer

John is a backend and platform engineer with 10+ years architecting production systems, APIs, and real-time data pipelines. He recently built a multi-exchange platform in Python/FastAPI with third-party API integrations, live data processing, and an admin dashboard. He also builds LLM systems focused on reliability, grounding outputs to their source and adding deterministic verification so AI can't assert what it can't prove. His depth extends to blockchain architecture across EVM and Solana.

Smart Contract DevelopmentReact.jsNext.jsSolidityDockerExcel DevelopmentLinuxMySQLEthereumNode.jsNFTDecentralized Finance (DeFi)Hyperledger
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Julian Cislo, Smart Contract Coder.

Julian Cislo

Verified Expert in Engineering
5 Years of Experience

Smart Contract Developer

Julian is a full-stack Web 3.0 developer and consultant. He specializes in solidity smart contracts design, development, and security considerations. He has founded QuantDeFi, a consulting company in the blockchain space that offers to solve all Web 3.0-related problems for clients looking to integrate blockchain solutions. Julian also features his skills in transaction automation, having constructed arbitrage and liquidation bots utilizing flash-loan technologies.

Smart Contract DevelopmentWindows DevelopmentTypeScriptSolidityJavaScriptBlockchainWeb3.jsReact.jsEthereumDecentralized Finance (DeFi)Node.jsNFTPython
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Alisson Reinaldo Silva, Accomplished Smart Contract Freelancer.

Alisson Reinaldo Silva

Verified Expert in Engineering
15 Years of Experience

Smart Contract Developer

Alisson is an engineering manager and certified AWS Solutions Architect with 15+ years of experience building software, leading technical teams for companies in the US, Europe, Asia, and South America, full-time and part-time as a contractor, for startups and Fortune 500 companies reporting to the C-suite. He's very interested in AI (he has a machine learning certificate from Stanford from the legendary Andrew Ng), games, and physics in general.

Smart Contract DevelopmentNode.jsJavaScriptC#React.jsAngularVue.jsMongoDBTypeScriptAWS LambdaAmazon S3AWSAWS RDS
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Daniel Trinh, Senior Smart Contract Programmer and Consultant.

Daniel Trinh

Verified Expert in Engineering
8 Years of Experience

Smart Contract Developer

Daniel is a lead Solidity developer with five years of experience in development and four years in Blockchain. He specializes in EVM protocols, decentralized finance, and NFTs. He's built several products in this space, including a Crowdfunding Protocol, a 200MM Stablecoin Protocol, an automated on-chain trading engine, and several NFT apps on Ethereum. Daniel is constantly learning about new projects, best practices, and design patterns in the EVM and blockchain protocol space.

Smart Contract DevelopmentSolidityNode.jsCSSAWSEthereumNFTBlockchainPostgreSQLFull-stack
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Imi Kim, Freelance Smart Contract Engineer.

Imi Kim

Verified Expert in Engineering
16 Years of Experience

Smart Contract Developer

Imi is a seasoned developer with over 30 years of experience leading and implementing systems to solve complex business problems. He has solid expertise in blockchains, mathematical and back-end coding, machine learning, trading, and systems design. Imi can help create a highly efficient version of whatever system a client is working on.

Smart Contract DevelopmentC#
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Abhi Panchal, Accomplished Smart Contract Freelancer.

Abhi Panchal

Verified Expert in Engineering
8 Years of Experience

Smart Contract Developer

Abhi is a generative AI engineer with 6+ years of experience building production-grade agentic systems. He specializes in LLMs, RAG, multi-agent orchestration, and autonomous AI workflows using LangChain and Google ADK. Abhi designs systems with robust guardrails, LLM evaluation, and end-to-end observability — covering tracing, monitoring, and human-in-the-loop review. He deploys scalable, low-latency AI pipelines on AWS and GCP, delivering reliable, enterprise-ready solutions.

Smart Contract DevelopmentPythonREST APIFlaskLLMChatbot DevelopmentRAGMachine LearningDeep LearningPyTorchTensorFlowDockerDevOps
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Robert Pardela, Smart Contract Engineer.

Robert Pardela

Verified Expert in Engineering
26 Years of Experience

Smart Contract Developer

Robert is an entrepreneur, IT manager, and developer specializing in blockchain. He has spearheaded dozens of large-scale projects, teams of over 40, and a budget of $30 million to deliver nationwide systems. Blockchain inspired him and changed the way he looked at IT systems. Robert is known for his innovation and strong ability to take a project from idea to successful implementation. He enjoys creating IoT solutions on Raspberry Pi and Arduino as a hobby.

Smart Contract DevelopmentXamarinJavaScriptSolidityNode.jsBlockchainREST APISoftware DevelopmentEthereumSoftware ArchitectureWeb DevelopmentBack-end DevelopersFront End
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Dominik Krížo, Freelance Smart Contract Developer for Hire.

Dominik Krížo

Verified Expert in Engineering
8 Years of Experience

Smart Contract Developer

Dominik is an elite blockchain security researcher and bounty hunter with consistent top placements in audit competitions and high-value bug bounties on Immunefi. Specializing in Solana and Rust-based protocols, he has identified critical vulnerabilities across DeFi platforms, smart contracts, and blockchain infrastructure. His transition from blockchain development to security research provides unique insight into both building and breaking protocols.

Smart Contract DevelopmentAndroidWindows DevelopmentAgile DevelopmentC++GitJiraKotlinSolidityAlgorithmsJavaC#Node.js
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Sven Meyer, Smart Contract Coder.

Sven Meyer

Verified Expert in Engineering
7 Years of Experience

Smart Contract Developer

Sven has 20+ years of experience working on the most advanced and innovative technologies: IoT, data science, machine learning AI, and distributed systems. Since 2017 he has mainly focused on blockchain technology, working as a CTO and advisor, leading the technology and product definition. Sven developed smart contracts for blockchain-based decentralized finance platforms, token launch platforms, and real-world assets (RWA) tokenization with fractional ownership, securing over $100 million.

Smart Contract DevelopmentEthereumBlockchainSolidityEmbedded Software EngineeringNFTSoftware Architecture
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Joseph Saw, Freelance Smart Contract Developer for Hire.

Joseph Saw

Verified Expert in Engineering
8 Years of Experience

Smart Contract Developer

Joseph is an experienced full-stack developer who has worked on various projects, including crypto payment solutions and decentralized yield tokenization and trading. In his spare time, he occasionally works on arbitrage bots and, most recently, created YouTube videos to provide education on smart contracts and solidity.

Smart Contract DevelopmentSolidityVue.jsTypeScriptJavaScriptEthereumWeb3.jsBlockchainjQueryWeb DevelopmentNFTCybersecurityNode.js
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