Hire the Top 3% of Blockchain Developers in 48 Hours

Toptal is a network of top Blockchain developers, engineers, consultants, and designers. Top companies work with Toptal Blockchain engineers to launch ICOs, write smart contracts, create DApps, and more.

Meet Blockchain Developers in Our Exclusive Network

Featured Talent

Mohammadi Gheis, Accomplished Blockchain Freelancer.

Mohammadi Gheis

Verified Expert in Engineering
13 Years of Experience

Blockchain Developer

Gheis is a blockchain expert and developer with experience in C++, C#, JavaScript, Go, Node.js, and MQL4/5. He excels in developing blockchain services, cross-platform software, artificial intelligence, trading bots, auto trade algorithms, and DApps while delivering top-notch user-friendly solutions. As a leader of the back-end, blockchain, and DevOps teams of 10+ developers, Gheis has been involved in many high-tech projects solving complex systems and identifying improvement opportunities.

BlockchainNode.jsGolangSolidityEthereumC++Back-end DevelopersSmart Contract DevelopmentWeb3.jsNoSQLSQLDecentralized Finance (DeFi)API
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Robert Pardela, Blockchain Engineer.

Robert Pardela

Verified Expert in Engineering
26 Years of Experience

Blockchain 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.

BlockchainXamarinJavaScriptSolidityNode.jsREST APISoftware DevelopmentEthereumSmart Contract DevelopmentSoftware ArchitectureWeb DevelopmentBack-end DevelopersFront End
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Alisson Reinaldo Silva, Accomplished Blockchain Freelancer.

Alisson Reinaldo Silva

Verified Expert in Engineering
15 Years of Experience

Blockchain 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.

BlockchainNode.jsJavaScriptC#React.jsAngularMongoDBTypeScriptAWS LambdaAmazon S3AWSAWS RDSDocker
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Sven Meyer, Blockchain Coder.

Sven Meyer

Verified Expert in Engineering
7 Years of Experience

Blockchain 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.

BlockchainEthereumSolidityEmbedded Software EngineeringSmart Contract DevelopmentNFTSoftware Architecture
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Daniel Trinh, Senior Blockchain Programmer and Consultant.

Daniel Trinh

Verified Expert in Engineering
8 Years of Experience

Blockchain 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.

BlockchainSolidityNode.jsCSSAWSEthereumNFTSmart Contract DevelopmentPostgreSQLFull-stack
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Julian Cislo, Blockchain Coder.

Julian Cislo

Verified Expert in Engineering
5 Years of Experience

Blockchain 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.

BlockchainWindows DevelopmentTypeScriptSolidityJavaScriptWeb3.jsReact.jsSmart Contract DevelopmentEthereumDecentralized Finance (DeFi)Node.jsNFTPython
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John R. Kosinski, Blockchain Coder.

John R. Kosinski

Verified Expert in Engineering
19 Years of Experience

Blockchain Developer

John is a senior technologist and system owner specializing in high‑risk, high‑constraint environments across blockchain, financial markets, and large‑scale distributed systems. He is known for owning systems end‑to‑end where failure carries real financial, operational, or reputational consequences. John brings ideas from concept to production under risk, constraint‑driven architecture, and decision ownership in ambiguous environments.

BlockchainSolidityC#Agile DevelopmentJavaScriptJSONC++Microsoft DevelopmentNode.jsEthereumSoftware DevelopmentSoftware ArchitectureWeb3.js
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Kaustav Chakraborty, Blockchain Freelancer.

Kaustav Chakraborty

Verified Expert in Engineering
24 Years of Experience

Blockchain Developer

Kaustav is a hands-on, goal-oriented, versatile technology professional with more than two decades of experience, primarily in open-source digital technologies, such as blockchain, IoT, microservices, cloud, distributed architecture, R&D, design, and development, with a proven track record delivering consistent business results. He loves to take on technical challenges, learn about new technology innovations, and deliver successful products worldwide.

BlockchainJavaSpring BootEthereumApache KafkaSpringMicroservices DevelopmentNode.jsSoliditySmart Contract DevelopmentDatabaseFintech DevelopmentCI/CD
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Harish Gupta, Toptal Blockchain Developer.

Harish Gupta

Verified Expert in Engineering
17 Years of Experience

Blockchain Developer

Harish has a penchant for innovation, strategy, technology, and architecture. He is unafraid to use new approaches for thinking, evaluating, and continuous improvement. Harish designed an app to manage identities, keeping GDPR regulations, and a blockchain-based application for drone air traffic management. He has outstanding technical abilities and expertise in blockchain, DevOps, and cloud computing. Harish has delivered solutions in the financial, aerospace, and supply chain spaces.

BlockchainNode.js
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David Braun, Expert Blockchain Programmer for Hire.

David Braun

Verified Expert in Engineering
33 Years of Experience

Blockchain Developer

David is a senior software engineering generalist with blockchain and security experience. With two years of management training and strong communication skills, he excels at bridging business requirements with modern technology. His EECS degree from U.C. Berkeley is evidence of his technical depth. David's current passion is building on his experience as a leader to maximize team effectiveness through industry best practices.

BlockchainPythonJavaScriptNode.jsAgile DevelopmentGitHubGit
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Sjon-Paul Brown, Freelance Blockchain Engineer.

Sjon-Paul Brown

Verified Expert in Engineering
10 Years of Experience

Blockchain Developer

Sjon-Paul is a DevOps engineer who thrives on producing scalable systems and automation that stand the test of time. While deploying and managing software within the cloud, he understands and handles the complexities of the cloud so that everything works smoothly and scales. Sjon-Paul is also an advocate of creating secure, stable software and infrastructure that is predictable and maintainable over time.

BlockchainTerraformAWSAgile DevelopmentAWS LambdaAmazon APIAWS IAMCloud EngineeringCloudflare
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Discover More Blockchain Developers in the Toptal Network
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Hiring Made Easy

1

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Discuss your requirements and refine your scope in a call with a Toptal domain expert who specializes in your area of need.
2

Choose Your Talent

Get a shortlist of expertly matched Blockchain developers within 24 hours to review and interview.
3

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Start working with your chosen Blockchain developer. You’ll have up to two weeks to assess the fit: Pay only if you’re satisfied.
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Our experienced talent matchers specialize in identifying talent that fits your needs. They work to understand your exact requirements and hand-select the best professionals for your project.

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We help you scale your team up or down as needed, with quick and efficient hiring in under 48 hours.

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Our flexible engagement models allow you to choose the engagement type that suits your needs and adjust it anytime: hourly, part time, or full time.

Our Developer Screening Process

26.4%Applicants Pass

Language and Personality

Toptal developers possess excellent written and verbal communication skills. We test each candidate’s ability to convey complex technical concepts clearly across multiple collaboration tools and communication mediums. We also assess personality traits, looking for candidates who are passionate and fully engaged in their work.

7.4%Applicants Pass

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Developers are required to demonstrate their knowledge and problem-solving ability through various assessments. We evaluate candidates based on their specialized work experience and knowledge of core technical domains, such as algorithms, data structures, system design, software engineering fundamentals, and more.

3.6%Applicants Pass

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Toptal developers are skilled at tackling complex technical challenges creatively and independently. Each candidate participates in a live screening with one of our top developers, where they must demonstrate their ability to analyze technical challenges, propose multiple solution paths, and make decisions in real time.

3.2%Applicants Pass

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Toptal developers are required to complete a test project that reflects real client work. During this step, candidates demonstrate their ability to ideate, scope, implement solutions, and solve complex technical problems in real-world scenarios.

3%Applicants Pass

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Toptal developers are expected to maintain a strong track record while working with clients. We continuously evaluate our talent throughout engagements to ensure our high standards for excellence and performance are consistently met.

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Why Organizations Choose Toptal®

Toptal gave us access to the best designers out there, saving us a lot of time and allowing us to build the best possible product.

Thierry JakircevicGeneral Manager, Digital Solutions, Bridgestone

Toptal’s talent is really excellent. They are able to work through large business problems and code incredibly efficiently.

Emily LemonSenior Director, Cleveland Cavaliers

The kind of people we looked for were hard to find. Toptal helped us achieve our goals by bringing high quality resources to bear on very short notice.

Elmar PlatzerDigital Transformation Leader, CSR

If you’ve tried working with other vendors, Toptal is going to be a different type of company to work with; they’re going to meet you where your needs are.

Matthew SchumacherSenior Product Manager, Alpha - Precision Drilling

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