FinTech
A securities trading system for a brokerage, supporting Hong Kong, US and China A-share markets end to end.
A brokerage running across Hong Kong, US, and China A-share markets needed one platform instead of maintaining separate systems for each market. Orders, positions, and settlements had to move across three rule sets without staff reconciling between screens.
Each market has its own trading calendar, settlement cycle (T+1 for A-shares, T+2 for HK and US), and market data format. The real risk is not the matching engine, but keeping order state and settlement consistent when rules differ, and when a partial fill or a cancelled order crosses markets.
We built a Java and Spring Boot stack with Spring Cloud microservices, Redis for real-time order state, and MySQL for persistence. The market data feed, order management, and risk layers stay isolated per market, so a rule change in one market cannot leak into another.
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