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

1. Build and maintain interfaces for on-chain and off-chain interactions (RPC, event listening, cross-chain bridges)
2. Develop financial-grade backend services using Golang, including modules for authentication, clearing, risk control, and payment instruction processing
3. Design, develop, and maintain Solidity smart contracts for stablecoin operations (ERC20 standard, minting/burning, escrow mechanisms)
4. Write unit and security tests for smart contracts, and assist with security audits
5. Develop high-concurrency, highly available backend architectures to handle on/off-chain data synchronization
6. Prepare API documentation and deployment scripts, and contribute to CI/CD pipeline development
7. Troubleshoot production issues such as performance bottlenecks, on-chain confirmation delays, and node synchronization
8. Undertake ad hoc projects to support platform growth

Core Qualifications

1. 3+ years of hands-on experience in Golang, with experience in frameworks such as Echo, Fiber, or Gin
2. Proficiency in Solidity and understanding of EVM fundamentals, Gas optimization, and smart contract security patterns (e.g., reentrancy, overflow protection)
3. Experience with Ethereum development tools like OpenZeppelin, Hardhat, or Foundry
4. Strong knowledge of MySQL, including database design and performance optimization
5. Experience with Kafka and Redis
6. Knowledge of Docker, Kubernetes, and microservices-based architectures

Nice-to-Have Qualifications

1. Previous experience building backend systems for stablecoins, DeFi platforms, or cryptocurrency exchanges
2. Understanding of cross-chain technologies such as Wormhole, LayerZero, or CCIP

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