Question
2-5

Blockchain Engineer-Solidity +Ethereum

1/26/2026

The Blockchain Engineer will design and implement smart contracts for a stablecoin protocol, focusing on minting, burning, and collateral vaults. They will also integrate price oracle systems and optimize gas efficiency while ensuring security and maintainability of the contracts.

Working Hours

40 hours/week

Company Size

1,001-5,000 employees

Language

English

Visa Sponsorship

No

About The Company
VISEO is a global digital and business consulting company that assists its clients with their transformation journeys using advanced technology and industry expertise. We aim to make our clients’ digital strategy a reality, allowing them to be more productive, innovative, and competitive. Our comprehensive approach to digital transformation, combined with our international network and skilled teams, ensures lasting results and successful business transformations for our clients. VISEO operates in more than 20 countries, has 3000 employees and made €360 millions in revenue in 2023.
About the Role
About the Role

We're seeking an experienced Blockchain Engineer to help build and scale a major financial institution-backed stable coin project.
You'll be working on critical smart contract development, protocol design, and system architecture that powers our DApp.


Key Responsibilities
  • Design and implement robust smart contracts in Solidity for stablecoin protocol including minting/burning mechanisms, collateral vaults, and automated market operations.
  • Build and integrate with price oracle systems to ensure accurate real-time valuation and maintain peg stability.
  • Conduct comprehensive testing, participate in internal and external audits, and implement best practices to protect user funds.
  • Optimize gas efficiency across all contract interactions while maintaining code readability and security.
  • Develop and maintain upgradeable contract architectures using proxy patterns and governance mechanisms.
  • Integrate with various DeFi protocols, bridges, and cross-chain infrastructure to expand our stablecoin's utility and reach.

Required Qualifications
  • Bachelor of Science in Computer Engineer or related field
  • Expert-level proficiency in Solidity with at least 2 years of production smart contract development experience.
  • Deep understanding of the Ethereum Virtual Machine (EVM), gas optimization techniques, and contract design patterns.
  • Proven track record of deploying and maintaining smart contracts on Ethereum mainnet or major L2 networks.
  • Strong knowledge of DeFi protocols including lending markets, AMMs, and stablecoin mechanisms (both algorithmic and collateralized).
  • Experience with development frameworks such as Hardhat, Foundry, or Truffle. Solid understanding of smart contract security vulnerabilities (reentrancy, front-running, oracle manipulation, etc.) and mitigation strategies.
  • Familiarity with testing methodologies including unit tests, integration tests, and fork testing. Experience with Web3 libraries (ethers.js, web3.js) and blockchain indexing tools.

Preferred Qualifications
  • Prior experience working on stablecoin projects or other financial primitives in DeFi.
  • Knowledge of Hedera Hashgraph and its Solidity-compatible smart contract service.
  • Experience with Layer 2 solutions such as Arbitrum, Optimism, Polygon, or Base.
  • Familiarity with cross-chain bridges and multi-chain deployment strategies.
  • Understanding of tokenomics and mechanism design for stablecoins. Experience
  • participating in or conducting smart contract audits. Knowledge of formal verification tools like Certora or Slither. Contributions to open-source DeFi projects or Ethereum improvement proposals. Understanding of regulatory frameworks affecting stablecoins (MiCA, US stablecoin legislation, etc.).

Technical Skills
  • Solidity
  • Ethereum/EVM
  • Hardhat/Foundry
  • OpenZeppelin contracts
  • Gas optimization
  • Upgradeable contract patterns (UUPS, Transparent Proxy)
  • Ethers.js/Web3.js

GDPR MESSAGE: Our privacy policy has been updated to comply with the new regulations. We invite you to consult it by clicking here: https://www.viseo.com/fr/politique-de-confidentialite. The VISEO Group uses the data collected as part of your application to assess your suitability for the job in question. We use the Jazz HR tool to help us in our recruitment process. This tool complies with current regulations on the protection of personal data. The tool is hosted in the United States and is PrivacyShield certified for HR data. In all cases, we may keep your file for 5 years so that we can contact you again if another position matches your profile. You may, of course, object to this. To find out more about how your data is used and how you can exercise your rights, please consult our privacy policy https://www.viseo.com/fr/politique-de-confidentialite.

Key Skills
SolidityEthereumGas OptimizationSmart Contract DevelopmentDeFi ProtocolsHardhatFoundryEthers.jsWeb3.jsTesting MethodologiesSmart Contract SecurityTokenomicsCross-Chain InfrastructureUpgradeabilityOracle SystemsAudit Participation
Categories
TechnologyEngineeringFinance & AccountingData & AnalyticsSoftware
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