Senior Java Engineer — Web3 Backend & AI Agent Platform

United States Digital Space LLC; Hong Kong; On-site; HKD 600,000 - 900,000; Full time

Job summary

United States Digital Space LLC is building the next generation of Web3 platforms, focusing on Wallet Earn and AI Agent Marketplace. You will design and scale back-end services, ensure security, and drive performance across multi-chain investment and asset workflows.

The role emphasizes strong Java fundamentals, modern Spring frameworks, and experience with distributed systems. On-site Hong Kong, with exposure to DeFi and on-chain integration work.

Qualifications

• Solid Java fundamentals with Spring Boot/Cloud experience.
• Experience with MySQL, Redis, MQ and RPC middleware.
• Proven ability to design high-concurrency, distributed systems.
• Familiar with DeFi concepts and on-chain mechanics is a plus.

Responsibilities

• Design, build, and optimize the backend architecture for Wallet Earn.
• Develop the aggregated-investment risk control platform for stability and scalability.
• Improve protocol integration and onboarding efficiency across networks.
• Support multi-chain asset/position data parsing and real-time display.
• Own core modules for AI Agent Marketplace and explore DeFi/Web3 integration.
• Ensure high availability, performance, and robust production issue resolution.
• Improve architecture, monitoring, observability, and reliability.

Skills

Java

Spring Boot

Spring Cloud

High-concurrency

Tools

MySQL

Redis

MQ

RPC

Job description

United States Digital Space LLC is building the next generation of Web3 platforms, focusing on Wallet Earn and AI Agent Marketplace. You will design and scale back-end services, ensure security, and drive performance across multi-chain investment and asset workflows.

The role emphasizes strong Java fundamentals, modern Spring frameworks, and experience with distributed systems. On-site Hong Kong, with exposure to DeFi and on-chain integration work.