Smart Contract Engineer

Web3 Foundation; Singapore; On-site; SGD 80,000 - 100,000; Full time

Job summary

A leading Web3 technology organization is seeking a senior contributor for its smart contract engineering team in Singapore. You will design and implement robust and secure smart contracts primarily for decentralized finance (DeFi) applications. The ideal candidate has over 4 years of software engineering experience, including strong Solidity development and familiarity with security best practices. This role involves collaboration with product and backend teams while delivering secure, production-quality contracts.

Qualifications

• 4+ years of professional software engineering experience.
• 3-5+ years of Solidity development experience.
• At least 2 mainnet deployments ideally powering meaningful applications.

Responsibilities

• Contribute to the evolution of protocol architecture and contract design patterns.
• Design, implement, and maintain advanced Solidity smart contracts.
• Build comprehensive testing suites.

Skills

Solidity development

EVM smart contracts

Security fundamentals

Debugging complex systems

Foundry or similar frameworks

Prototyping

Excellent communication skills

Job description

About the Role

You will be a senior contributor within our smart contract engineering team, working closely alongside other engineers, product partners, and stakeholders to build the core systems that power high-value decentralized financial applications. This includes work on stablecoin systems, liquidity infrastructure, and broader DeFi protocols, among other emerging on-chain financial products.

You’ll design secure, scalable, and composable smart contracts used in production environments, help shape protocol architecture, and ensure a consistently high standard of security, reliability, and performance across everything the team delivers. You’ll collaborate deeply within the team to bring new on-chain ideas from concept through deployment and continuous improvement.

Key Responsibilities

Protocol Architecture & Technical Contributions

• Contribute to the evolution of protocol architecture, contract design patterns, and security best practices
• Make thoughtful technical decisions around performance, composability, and risk

Smart Contract Development

• Design, implement, and maintain advanced Solidity smart contracts using Foundry
• Build production-grade systems focused primarily on DeFi use cases and high-value financial logic
• Support deployment and lifecycle management across multiple networks

Security, Testing & Reliability

• Build comprehensive unit, integration, fuzzing, and fork testing suites
• Debug complex on-chain systems using traces, simulations, and low-level diagnostics
• Ship audit-ready, production-quality contracts that meet high security standards

Ownership & Execution

Own and deliver end-to-end contract development work streams, including:

• Core protocol components and upgrades
• High-risk, security-sensitive financial logic
• Ongoing maintenance and improvements of deployed systems

Collaboration

• Work closely with Product and Backend engineering teams as an active team member to refine requirements and deliver outcomes
• Contribute to specifications, documentation, and team design discussions

Qualifications

Required Experience

• 4+ years of professional software engineering experience, with strong emphasis on prototyping and new product development
• 3-5+ years of Solidity development experience, with proven production delivery of audited smart contracts
• At least 2 mainnet deployments, ideally powering widely used or financially meaningful applications
• Extensive experience with EVM smart contracts and DeFi-centric development
• Strong proficiency with Foundry or similar frameworks
• Solid understanding of protocol mechanics, gas efficiency, performance, and security fundamentals
• Familiarity with common vulnerability classes and best-practice mitigations
• Proven ability to debug complex systems using traces and simulations
• Comfortable working collaboratively within a team in fast-moving and ambiguous environments
• Excellent written and verbal communication skills

Nice to Have

• Experience participating in or responding to security audits; or writing audit-ready specs
• Experience working on stablecoin projects, with strong understanding of how pegs are designed and maintained; familiarity with other DeFi primitives such as lending or DEXs is a plus.
• Practical understanding of composability risks and protocol integrations
• Experience working on widely used protocols or infrastructure
• Startup or scale-up environment experience

Location and Logistics

East Asia preferred (Tokyo, Singapore, Hong Kong)