Backend Engineer

Position: Backend Engineer

Our client, a rapidly growing eCommerce company, is seeking a Backend Engineer with expertise in Golang and Solidity. This role focuses on building and maintaining robust backend systems for issuance, clearing, settlement, and risk control, while designing and supporting on-chain smart contracts. The ideal candidate has strong Golang experience and hands-on knowledge of Solidity.

Primary Responsibilities

• Build and maintain interfaces for on-chain and off-chain interactions (RPC, event listening, cross-chain bridges)

• Develop financial-grade backend services using Golang, including modules for authentication, clearing, risk control, and payment instruction processing

• Design, develop, and maintain Solidity smart contracts for stablecoin operations (ERC20 standard, minting/burning, escrow mechanisms)

• Write unit and security tests for smart contracts, and assist with security audits

• Develop high-concurrency, highly available backend architectures to handle on/off-chain data synchronization

• Prepare API documentation and deployment scripts, and contribute to CI/CD pipeline development

• Troubleshoot production issues such as performance bottlenecks, on-chain confirmation delays, and node synchronization

• Undertake ad hoc projects to support platform growth

Core Qualifications

• 3+ years of hands-on experience in Golang, with experience in frameworks such as Echo, Fiber, or Gin

• Proficiency in Solidity and understanding of EVM fundamentals, Gas optimization, and smart contract security patterns (e.g., reentrancy, overflow protection)

• Experience with Ethereum development tools like OpenZeppelin, Hardhat, or Foundry

• Strong knowledge of MySQL, including database design and performance optimization

• Experience with Kafka and Redis

• Knowledge of Docker, Kubernetes, and microservices-based architectures

Nice-to-Have Qualifications

• Previous experience building backend systems for stablecoins, DeFi platforms, or cryptocurrency exchanges

• Understanding of cross-chain technologies such as Wormhole, LayerZero, or CCIP