Java Web3 Jobs in China

1. Develop and maintain core custodial wallet modules including account management, deposit, withdrawal, sweeping, signing, and transaction broadcasting.
2. Integrate multiple blockchain protocols (BTC, ETH, Solana, Tron, Cosmos, etc.) through RPC, SDKs, or in-house solutions to ensure stable and high-availability operations.
3. Participate in the architecture and modular design of the wallet system to enhance scalability, reliability, and performance.
4. Implement automated monitoring, alerting, and logging systems for full traceability of asset flows.
5. Write high-quality, testable code; participate in code reviews and CI/CD processes.
6. Collaborate cross-functionally with frontend, DevOps, security, and risk teams to ensure overall system performance and security.

1. Bachelor’s degree or above in Computer Science, Information Security, or related fields.
2. 3+ years of backend development experience, with at least 1 year in blockchain wallet or node integration.
3. Proficiency in one or more backend languages (Node.js, Golang, Java, Rust, Python).
4. Solid understanding of blockchain architecture, transaction mechanisms, and concepts such as block structure, gas/fees, and nonces.
5. Familiarity with microservices, message queues (Kafka / RabbitMQ), caching (Redis), and databases (MySQL / PostgreSQL).
6. Strong security awareness with understanding of key management, signing, and permission control.

Nice to Have:

1. Experience integrating multi-chain protocols (BTC UTXO, ETH EVM, Solana, etc.).
2. Knowledge of MPC, HSM, KMS, or TEE technologies.
3. Fluent in English and Chinese, with the ability to collaborate in a global team.

*Only shortlisted candidates will be contacted.