Job Responsibilities:

1. Responsible for core development of Web3 backend services and middleware, including but not limited to blockchain data indexing, off-chain computation services, API interfaces, and distributed systems.

2. Design and implement highly available, high-concurrency microservices to support key business scenarios such as digital asset management, transaction processing, on-chain event listening, and notifications.

3. Interact with various blockchain nodes (e.g., Ethereum, Polygon, and other EVM chains), including RPC calls, transaction construction and parsing, and smart contract event listening.

4. Develop and maintain internal tools such as fund aggregation, address monitoring, and risk scanning to ensure system security and stable operation.

5. Write high-quality, maintainable code and establish and improve technical documentation, unit testing, and continuous integration processes.

6. Collaborate closely with product managers, front-end engineers, and smart contract developers to deliver products.

Position Requirements:

1. At least 3 years of Java development experience with solid programming fundamentals and a strong understanding of core frameworks such as IO, multithreading, and collections.

2. Proficient in Java and web applications; familiar with microservice architectures, distributed caching (Redis), message queues (Kafka/RabbitMQ), and database design.

3. Strong interest in and basic knowledge of Web3; understanding of blockchain fundamentals. Candidates with practical experience in developing blockchain data indexing, wallet services, or exchange backends are preferred.

4. Familiar with interacting with blockchain nodes (JSON-RPC/WebSocket); experience with Web3j or other Java-based blockchain development libraries is a plus.

5. Strong sense of responsibility, self-motivation, and excellent problem-solving skills; able to adapt to a remote collaboration and fast-iteration development environment.