Senior Smart Contract & Web3 Engineer

GenixBit Labs Pvt. Ltd.; United States; Remote; USD 140,000 - 200,000; Full time

Job summary

Genixbit is seeking a Senior Smart Contract & Web3 Engineer to design, audit, and optimize secure Solidity contracts on EVM chains. You will work remotely with a global team, focusing on zero-knowledge integrations, decentralized asset tracking, and robust audit practices.

Lead development with Foundry and Hardhat, perform automated security fuzzing and formal verification, and bridge on-chain state to frontends using Ethers.js, Viem, and GraphQL Subgraphs. Prioritize gas efficiency and security.

Qualifications

• 4+ years professional smart contract development experience (Solidity / EVM).
• Deep understanding of EVM assembly (Yul), gas optimization, and ERC standards (ERC-20, ERC-721, ERC-1155).
• Experience with Foundry, Hardhat, Ethers.js, and audit methodologies.
• Strong grasp of cryptographic primitives and decentralized architecture.

Responsibilities

• Architect gas-optimized Solidity smart contracts using Foundry and Hardhat.
• Conduct automated security fuzzing, static analysis (Slither), and formal verification.
• Integrate contract state with web frontends via Viem / Ethers.js and GraphQL Subgraphs.
• Deploy and manage decentralized oracle integrations and Layer-2 scaling bridges.

Skills

Solidity

EVM

Gas optimization

Foundry

Hardhat

Ethers.js

Viem

GraphQL Subgraphs

Tools

Foundry

Hardhat

Ethers.js

Viem

Subgraphs

Job description

Senior Smart Contract & Web3 Engineer

Full-time Remote Global / USA Remote Senior $140,000 - $200,000 / year

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About the Role

Develop and audit secure Solidity smart contracts on EVM chains, zero-knowledge proof integrations, and decentralized asset tracking protocols.

Key Responsibilities

• Architect gas-optimized Solidity smart contracts using Foundry and Hardhat
• Conduct automated security fuzzing, static analysis (Slither), and formal verification
• Integrate contract state with web frontends via Viem / Ethers.js and GraphQL Subgraphs
• Deploy and manage decentralized oracle integrations and Layer-2 scaling bridges

Requirements

• 4+ years professional smart contract development experience (Solidity / EVM)
• Deep understanding of EVM assembly (Yul), gas optimization, and ERC standards (ERC-20, ERC-721, ERC-1155)
• Experience with Foundry, Hardhat, Ethers.js, and audit methodologies
• Strong grasp of cryptographic primitives and decentralized architecture

Solidity Foundry TypeScript Ethers.js Viem Subgraphs