Solidity Developer

Confidential

Not specified permanent

Posted: March 9, 2026

Required Skills

Job Description

IntellectEU is an international technology company focused on digital finance and emerging technologies. At IntellectEU we are on a mission to become the top-of-mind fintech company. We are committed to our people and believe in building a better future with the newest technologies. We give rising talent and industry veterans the space to explore, launch ideas, and collaborate closely with our clients. With our technical hands-on experience in payments, blockchain and capital markets, there’s no challenge that’s left unsolved. Over the past two decades, we have earned our expertise in financial technology, executing on hundreds of complex integrations and co-creating new digital asset platforms alongside our clients.

Type of cooperation - on-site, Manassas (Virginia)

Responsibilities:

Design, build, and deploy distributed ledger technology (DLT) solutions and smart contracts using Solidity, Java, and REST APIs.

Implement secure transaction logic using cryptographic techniques to protect digital assets and prevent unauthorized access.

Research, develop, and implement various blockchain protocols and consensus algorithms.

Collaborate with Product Owners and technical teams to gather requirements and define technical solutions.

Integrate blockchain solutions with enterprise systems, databases, and APIs.

Analyze and troubleshoot system performance, network issues, and blockchain transaction problems.

Develop documentation and technical specifications for blockchain implementations.

Contribute to continuous improvement, DevOps practices, and operational support.

Work with AWS deployment environments and infrastructure tools.

Requirements:

Must have

Solid foundation in smart contracts development and relevant technologies (Solidity, Typescript, Viper etc).

Knowledge of smart contract dev tools/frameworks - foundry, hardhat, openzeppelin libraries (Upgradeable contracts, proxy patterns)

Knowledge of smart contract security aspects (re-entrance attack, Race conditions, Integer overflow/underflow, Denial of service, etc).

Experience with Solidity security testing tools like Slither, Mythril, and Echidna

Production experience with EVM-based blockchain applications.

Familiarity with basic cryptography and P2P networks.

Experience with web3.js or ether.js, and crypto wallets like MetaMask or MEW.

Understanding of RESTful web services design.

Understanding of the modern development ecosystem: Git, CI/CD, and automated testing.

Nice to have

Experience with Hyperledger Besu

Proficiency with databases such as MySQL, Oracle, and MongoDB.

Knowledge of Level 2 scaling technologies

Experience with implementing ERC20 and ERC721 or IERC1155 contracts.

We guarantee:

International experience in a stable company: the company has offices in Antwerp, Lisbon, Krakow, Kyiv, New York and operates on the market for over 15 years.

A passionate team in an innovative, casual, positive, and open work environment ready to meet your new ideas.

Great opportunities for personal and professional development as well as the chance to change the way the business works in the financial world.

Join us to make an impact on the entire financial world!

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