Back
Profile
Harris
Han
Website
Not specified
Country
Not specified
Specializations
No specializations specified yet
About me
Not specified
Preferred payment options
No payment options specified yet
Harris Han
Senior Smart Contract Engineer, AI Agent Payments
Singapore
Singapore
Full time
Remote
About DCS Card Centre
DCS Card Centre is a financial payments and Web3 company building at the intersection of AI agents and on-chain payments. We are hiring a Senior Smart Contract Engineer to design and implement the on-chain contracts and protocol integrations that enable autonomous payments by AI agents.
This is a deeply technical role focused on stablecoin settlement, on-chain authorization, agent identity, trusted machine-to-machine transactions, and secure payment infrastructure. You will write secure, gas-efficient, auditable Solidity code that may directly handle real value. Contract safety, code quality, and risk awareness are the highest priorities.
What You Will Work On
Design, develop, and test core payment smart contracts for stablecoin settlement, escrow/clearing, on-chain authorization, subscriptions, and usage-based billing.
Build reusable Solidity components and engineering standards for secure, gas-efficient, and audit-ready contracts.
Implement security best practices, including reentrancy protection, access control, integer safety, permission boundaries, upgrade risk review, and audit remediation.
Integrate emerging agentic payment protocols such as x402, AP2, ERC-8004, and related standards.
Build the on-chain identity, payment authorization, and stablecoin settlement loop for AI agents.
Contribute to multi-chain and L2 payment infrastructure, batch settlement, gas optimization, and stablecoin payment rails.
Work closely with backend, product, and risk teams to safely connect on-chain capabilities to production business flows.
Requirements
3–5 years of smart contract or blockchain engineering experience. Strong candidates with exceptional project experience are also welcome.
Strong Solidity expertise and hands-on experience shipping production smart contracts.
Deep understanding of the EVM, gas optimization, and common Solidity frameworks such as Foundry or Hardhat.
Strong smart contract security mindset and familiarity with common vulnerabilities and audit workflows.
Experience with at least one major EVM ecosystem such as Ethereum, Base, BNB Chain, or other L2 networks.
Experience in stablecoins, payments, DeFi, clearing/settlement, or other financial smart contract systems.
High ownership mindset and strong sensitivity to fund safety and production risk.
Nice To Have
Experience with agentic payment protocols such as x402, AP2, MPP, or ERC-8004.
Smart contract audit or formal verification experience with tools such as Slither, Echidna, Certora, or similar.
Experience with stablecoin payments, cross-chain settlement, or account abstraction such as ERC-4337.
Familiarity with AI Agent, MCP, A2A, or related agent technology stacks.
Rust or Move smart contract experience.
Financial services or payments industry background.
Location
Remote. Preferred working timezone overlap with Shanghai and Singapore. Outstanding candidates from other regions are welcome.
Compensation
Negotiable, depending on experience and fit.
How To Apply
Please send your CV, GitHub profile, and relevant smart contract, audit, DeFi, or payment project links to harris.han@dcsserv.com.
Company: DCS Card Centre Website: https://dcscc.com/
DCS Card Centre is a financial payments and Web3 company building at the intersection of AI agents and on-chain payments. We are hiring a Senior Smart Contract Engineer to design and implement the on-chain contracts and protocol integrations that enable autonomous payments by AI agents.
This is a deeply technical role focused on stablecoin settlement, on-chain authorization, agent identity, trusted machine-to-machine transactions, and secure payment infrastructure. You will write secure, gas-efficient, auditable Solidity code that may directly handle real value. Contract safety, code quality, and risk awareness are the highest priorities.
What You Will Work On
Design, develop, and test core payment smart contracts for stablecoin settlement, escrow/clearing, on-chain authorization, subscriptions, and usage-based billing.
Build reusable Solidity components and engineering standards for secure, gas-efficient, and audit-ready contracts.
Implement security best practices, including reentrancy protection, access control, integer safety, permission boundaries, upgrade risk review, and audit remediation.
Integrate emerging agentic payment protocols such as x402, AP2, ERC-8004, and related standards.
Build the on-chain identity, payment authorization, and stablecoin settlement loop for AI agents.
Contribute to multi-chain and L2 payment infrastructure, batch settlement, gas optimization, and stablecoin payment rails.
Work closely with backend, product, and risk teams to safely connect on-chain capabilities to production business flows.
Requirements
3–5 years of smart contract or blockchain engineering experience. Strong candidates with exceptional project experience are also welcome.
Strong Solidity expertise and hands-on experience shipping production smart contracts.
Deep understanding of the EVM, gas optimization, and common Solidity frameworks such as Foundry or Hardhat.
Strong smart contract security mindset and familiarity with common vulnerabilities and audit workflows.
Experience with at least one major EVM ecosystem such as Ethereum, Base, BNB Chain, or other L2 networks.
Experience in stablecoins, payments, DeFi, clearing/settlement, or other financial smart contract systems.
High ownership mindset and strong sensitivity to fund safety and production risk.
Nice To Have
Experience with agentic payment protocols such as x402, AP2, MPP, or ERC-8004.
Smart contract audit or formal verification experience with tools such as Slither, Echidna, Certora, or similar.
Experience with stablecoin payments, cross-chain settlement, or account abstraction such as ERC-4337.
Familiarity with AI Agent, MCP, A2A, or related agent technology stacks.
Rust or Move smart contract experience.
Financial services or payments industry background.
Location
Remote. Preferred working timezone overlap with Shanghai and Singapore. Outstanding candidates from other regions are welcome.
Compensation
Negotiable, depending on experience and fit.
How To Apply
Please send your CV, GitHub profile, and relevant smart contract, audit, DeFi, or payment project links to harris.han@dcsserv.com.
Company: DCS Card Centre Website: https://dcscc.com/