Solidity Engineer – On-Chain Data Exchange (NFT/DEX)

Smart Gate Technologies and Consulting; Deutschland; Remote; EUR 90,000 - 140,000; Full time

Job summary

Smart Gate Technologies and Consulting is seeking a Solidity engineer with 3+ years of experience to develop production contracts and work with EVM-based systems in a security-conscious environment.

You will work on contracts for DeFi components, NFT exchanges, or perpetual-style trading, ensuring proper storage, events, and proxy patterns, and integrating price feeds and oracles as needed.

Qualifications

• 3+ years of experience building Solidity contracts for production applications.
• Deep familiarity with EVM mechanics: storage layout, events, proxy patterns, calldata management.
• Hands-on experience with DEXs, NFT exchanges, or perp-style trading systems and strong understanding of pricing mechanisms (oracles, TWAPs, bonding curves, auctions, etc.).
• Experience shipping audited smart contracts to mainnet with examples.

Responsibilities

• Develop and maintain production-ready Solidity contracts.
• Analyze and optimize gas usage and storage layout.
• Collaborate with front-end, security, and QA teams to deploy audited code.
• Integrate oracles, price feeds, and pricing mechanisms into contracts.

Skills

Solidity

EVM knowledge

Auditing security practices

Pricing mechanisms

Tools

Hardhat

Foundry

Brownie

Git workflows

Job description

Hiring Criteria

3+ years of experience building Solidity contracts for production applications

Deep familiarity with EVM mechanics: storage layout, events, proxy patterns, calldata management

Hands-on experience with DEXs, NFT exchanges, or perp-style trading systems & Strong understanding of pricing mechanisms (e.g. oracles, TWAPs, bonding curves, auctions, etc.)

Experience shipping audited smart contracts to mainnet (please include examples)

Proficient with Hardhat, Foundry, or Brownie; Git-based workflows