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The Future of Blockchain Development

Blockchain technology is revolutionizing trust-based activities across industries. Find the qualified talent you need from Toptal’s vetted network of blockchain engineers.


Critical Future Global® Blockchain Development Services

Custom Development

Whether through the creation of decentralized applications or support of a private blockchain, Toptal’s experienced blockchain developers help clients take advantage of the numerous opportunities that the emerging technology has to offer.

Blockchain Security

Blockchain provides alternative options for digital security, using familiar cryptography but with unchangeable data. Work with Toptal developers to understand how your company can use blockchain as a means to secure data and enhance the trust verification processes.

Smart Contracts

Smart contracts are programmed contracts that utilize execution in a distributed environment for enforceability. These can variously be used to support crowdfunding, blind auctions, multi-signature wallets, and more.


Companies are turning to Ethereum, a blockchain-based platform, for broader applications of trust verification beyond just cryptocurrency including smart contracts (powered by the programming language Solidity).


The most popular cryptocurrency in the world, Bitcoin was also the first distributed blockchain. Toptal developers have experience with Bitcoin Core, the underlying reference client for the currency, as well as with the digital currency itself.


Created by the Linux Foundation, Hyperledger is a project of open-source blockchains and related tools. Toptal Hyperledger developers have experience in Hyperledger blockchain platforms like Fabric and Sawtooth, and tools such as Cello.

How Critical Future Global® Works

Talk to One of Our Industry Experts
A Toptal Director of Engineering will work with you to understand your goals, technical needs, and team dynamics.
Work with Hand-Selected Talent
Within days, we’ll introduce you to the right talent for your project. Average time to match is under 24 hours.
The Right Fit, Guaranteed
Work with your new team member for a trial period (pay only if satisfied), ensuring they’re the right fit before starting the engagement.

A Distributed Network of Top Talent

Konstantin Medvedev
Bitcoin Developer

Formerly an engineer at Deutsche Bank and RBC, Konstantin brings 18 years of financial sector experience to blockchain including his work to develop a Bitcoin exchange.

Previously at

Work with Konstantin

Andras Fuchs
Blockchain Engineer

With previous experience at Vodafone and Hewlett Packard, Andras has helped companies build private blockchains as well as Bitcoin payment systems.

Previously at

Work with Konstantin

Radek Ostrowski
Ethereum Developer

After working as a senior engineer at Sony and Expedia, Radek is now enmeshed in the Ethereum ecosystem and has substantial experience creating smart contracts.

Previously at

Work with Konstantin

Trending Articles in Blockchain Development

Read the latest research from experts about trends in blockchain development.


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Major European Regulator, Banks Collaborate on Blockchain Warrant-Issuance System

Eight major European financial entities have announced they will work together on a blockchaintech project for recording the issuance of financial warrants, Spanish news outlet el Economistareports today.

south korea to back blockchain development with usd 200 million+

South Korea has been at the center of crypto trading. Now it looks like the nation’s government is looking for ways to support blockchain development. In a recent statement, the national Government of South Korea announced plans to fund a broad-based effort to develop a range of blockchain technologies.

do you really know who you’re hiring? let blockchain help you

EMPLOYERS have struggled for years with the question of how to know if a new potential employee is telling the truth about their credentials. The problem of false resumes can have costly implications for businesses. And with the increasingly competitive job market, it is becoming more and more common for individuals to provide false information on their resume in order to try and secure a job.

cryptocurrencies and blockchain technology will propel “open source” banking

Bitcoin, Ethereum, 0xProject, Dharma, and Aragon are all incredible building blocks for an open source decentralized future. However, an open-source financial system requires an open-source interface to operate successfully. Balance is, therefore, leading the open-source banking movement by building a Distributed Autonomous Bank (DAB).

The Future Of 
On-Demand Talent

Learn how organizations are building virtual workforces to get the
most out of on-demand talent, and read about the future of work on
Toptal Insights.