Smart Contracts Developer

Workload: full-time

Start: 1st of November

Duration: long-term (2-year contract)

Location: any, but preferably Ukraine or Europe

English: B2

Required expertise: at least 2 years of experience with Solidity and Javascript/Typescrypt!

We are building the next generation of onchain index products, making diversified crypto exposure simpler, more transparent, and accessible through a single token.

We are looking for a Smart Contracts Developer to join our team and help design, develop, test, and maintain the smart contracts powering the Indexfy ecosystem.

What you'll do

Design and develop secure, gas-efficient Solidity smart contracts.

Build and improve the infrastructure behind Indexfy's onchain index products.

Develop vaults, token contracts, fee mechanisms, and other DeFi protocols.

Write comprehensive unit and integration tests.

Review and improve existing smart contracts with a strong focus on security.

Participate in smart contract architecture and protocol design decisions.

Integrate contracts with protocols such as Uniswap, Aave, Chainlink, and other DeFi infrastructure where relevant.

Work closely with backend and frontend developers to integrate onchain functionality.

Assist with contract deployments, upgrades, monitoring, and maintenance across EVM-compatible networks.

Contribute to security reviews and prepare contracts for external audits.

Requirements

Strong experience with Solidity and EVM-based blockchains.

Solid understanding of ERC-20, ERC-4626 and DeFi protocols.

Experience with Hardhat, Foundry or similar development frameworks.

Strong understanding of smart contract security and common Solidity vulnerabilities.

Experience writing automated tests for smart contracts.

Good understanding of blockchain architecture, transactions, gas optimization, and contract interactions.

Familiarity with OpenZeppelin contracts and libraries.

Ability to write clean, maintainable, and well-documented code.

Nice to have

Experience with Base / Ethereum.

Experience with Uniswap V3/V4, Aave, Chainlink or other DeFi protocols.

Experience building vaults, index products, AMMs or financial protocols.

Experience with cross-chain protocols such as Chainlink CCIP or LayerZero.

Previous experience preparing smart contracts for security audits.

Contributions to open-source blockchain projects.