Blockchain Engineer - Custodial Wallet

- Develop and maintain core custodial wallet modules including account management, deposit, withdrawal, sweeping, signing, and transaction broadcasting - Integrate multiple blockchain protocols (BTC, ETH, Solana, Tron, Cosmos, etc.) through RPC, SDKs, or in-house solutions to ensure stable and high-availability operations - Participate in the architecture and modular design of the wallet system to enhance scalability, reliability, and performance - Implement automated monitoring, alerting, and logging systems for full traceability of asset flows - Write high-quality, testable code; participate in code reviews and CI/CD processes - Collaborate cross-functionally with frontend, DevOps, security, and risk teams to ensure overall system performance and security **Requirements**- Bachelor's degree or above in Computer Science, Information Security, or related fields - 3+ years of backend development experience, with at least 1 year in blockchain wallet or node integration - Proficiency in one or more backend languages (Node.js, Golang, Java, Rust, Python) - Solid understanding of blockchain architecture, transaction mechanisms, and concepts such as block structure, gas/fees, and nonces - Familiarity with microservices, message queues (Kafka / RabbitMQ), caching (Redis), and databases (MySQL / PostgreSQL) - Strong security awareness with understanding of key management, signing, and permission control **Nice to Have:** - Experience integrating multi-chain protocols (BTC UTXO, ETH EVM, Solana, etc.) - Knowledge of MPC, HSM, KMS, or TEE technologies - Fluent in English and Chinese, with the ability to collaborate in a global team \*Only shortlisted candidates will be contacted.