Senior Solidity / Smart Contract Developer

Sequere Technologies; Mohali; On-site; INR 2,000,000 - 4,000,000; Full time

Job summary

Sequere Technologies is seeking a senior Solidity engineer to architect and audit DeFi, NFT, and DAO contracts in a fast-moving Web3 environment. You will write, test, and optimise smart contracts, review security, and interface with frontend clients using ethers.js.

Deep knowledge of EVM, gas optimization, and audit practices is essential for this role in Mohali, India. Candidates should demonstrate deployment experience on mainnet and familiarity with Layer2, OpenZeppelin, and upgradeable

Qualifications

• 4+ years Solidity dev with mainnet deployment experience.
• Deep understanding of EVM, gas optimisation, and common attack vectors.
• Proficiency with Hardhat or Foundry testing frameworks.
• Experience with OpenZeppelin libraries and proxy patterns.
• Strong understanding of DeFi primitives (AMMs, lending, staking).

Responsibilities

• Write, test, and audit Solidity contracts for DeFi, NFT, and DAO protocols
• Design secure, gas-optimised contract architectures
• Perform security reviews and vulnerability assessments
• Integrate contracts with frontend clients using ethers.js / wagmi
• Stay current with EIPs, protocol upgrades, and best practices
• Support client teams through deployment and post-launch operations

Skills

Solidity development

EVM internals

Gas optimisation

Security auditing

DeFi protocols

OpenZeppelin

Tools

Hardhat

Foundry

ethers.js

Job description

You'll architect and audit smart contracts for some of the most ambitious Web3 projects on the market - DeFi protocols, NFT platforms, DAO infrastructure, and cross-chain systems. Security and precision are non-negotiable here.

Responsibilities

• Write, test, and audit Solidity smart contracts for DeFi, NFT, and DAO protocols
• Design secure, gas-optimised contract architectures
• Perform security reviews and vulnerability assessments
• Integrate contracts with frontend clients using ethers.js / wagmi
• Stay current with EIPs, protocol upgrades, and best practices
• Support client teams through deployment and post-launch operations

Requirements

• 4+ years of Solidity development with mainnet deployment experience
• Deep understanding of EVM internals, gas optimisation, and common attack vectors
• Proficiency with Hardhat or Foundry testing frameworks
• Experience with OpenZeppelin libraries and proxy patterns
• Strong understanding of DeFi primitives (AMMs, lending, staking)

Nice to have

• Experience with Layer 2 networks (Arbitrum, Optimism, Base)
• Knowledge of Rust / Anchor for Solana development
• Formal verification or audit report writing experience