Senior Solidity Developer

MANTRA; Hong Kong; On-site; HKD 900,000 - 1,500,000; Full time

Job summary

MANTRA is seeking a Senior Solidity Developer to lead design, development, and deployment of secure, scalable smart contracts powering our DeFi and blockchain infrastructure. You will own core contract architecture, optimize performance, and ensure robust security practices while collaborating with product teams and engineers.

You will mentor teammates, review code, and stay ahead of evolving Layer 2 and DeFi protocols to deliver production-ready solutions that scale to millions of users.

Qualifications

• 5+ years of professional Solidity development experience.
• Deep understanding of Ethereum and EVM internals.
• Experience with security audits and best practices.
• Familiarity with Layer 2 solutions.

Responsibilities

• Design, develop, and deploy production-ready smart contracts using Solidity.
• Conduct security audits and implement best practices for contract security.
• Optimize gas efficiency and contract performance.
• Integrate contracts with frontend applications and oracles.
• Lead code reviews and establish development standards.
• Mentor junior developers and provide technical guidance.
• Collaborate with product managers and designers.
• Stay current with evolving blockchain technologies and DeFi protocols.

Skills

Solidity

EVM internals

Gas optimization

Smart contract security

Web3.js

Testing frameworks

Tools

Hardhat

Truffle

Foundry

Web3.js

Ethers.js

Git

CI/CD

Job description

Senior Solidity Developer

About MANTRA

MANTRA has disrupted the status quo since 2020. As pioneers in the Web3

revolution, we've spent years building game changing decentralized protocols

focused on empowering communities and democratizing finance.

Our journey began by fuelling grassroots DeFi activism. But we recognized the need

to scale impact, bridging the divide between permissionless protocols and

regulated systems. So we transformed, developing a first of its kind regulated DEX

that's rewiring finance on a sovereign blockchain built from the ground up.

Now as this industry matures, MANTRA aims to connect TradFi with a new,

blockchain native future. We're rebuilding finance through relentless product

innovation.

The Role

We are looking for a highly skilled Senior Solidity Developer to join our growing team

and take a leading role in building the next generation of decentralized applications

and blockchain infrastructure. In this role, you will drive the design, development,

and deployment of secure, scalable, and innovative smart contracts that power our

ecosystem.

As a senior member of the team, you will be hands-on in architecting complex

blockchain solutions, setting technical direction, and ensuring best practices for

security and performance. You’ll collaborate closely with product managers,

engineers, and stakeholders to transform ambitious ideas into production-ready

code that can support millions of users.

Key Responsibilities

• Design, develop, and deploy production-ready smart contracts using Solidity
• Conduct thorough security audits and implement best practices for smart contract security
• Optimize gas efficiency and contract performance
• Integrate smart contracts with frontend applications and oracles etc
• Lead code reviews and establish development standards
• Mentor junior developers and provide technical guidance
• Collaborate with cross-functional teams including product managers anddesigners
• Stay current with evolving blockchain technologies and DeFi protocols

What We’re Looking For

• 5+ years of professional Solidity development experience
• Deep understanding of EVM internals and fundamentals
• Extensive experience with smart contract frameworks (Hardhat, Truffle,Foundry)
• Proficiency in Web3.js, Ethers.js, and blockchain integration
• Strong knowledge of DeFi protocols, tokenomics, and governancemechanisms
• Experience with smart contract security practices and commonvulnerabilities
• Familiarity with testing frameworks and automated testing strategies
• Knowledge of Layer 2 solutions (Polygon, Arbitrum, Optimism)
• Experience with version control (Git) and CI/CD pipelines