Building a Trade Matching Engine from Scratch in Go

Every exchange — whether it trades stocks, crypto, or commodities — has a matching engine at its core. It is the component that takes buy and sell orders, finds compatible pairs, and executes trades. Despite being so fundamental, the inner workings of a matching engine are rarely discussed in the open. Most implementations live behind proprietary walls. This article walks through MatchEngine , an open-source order matching engine written in Go. We will cover the core algorithm, the data structures behind the order book, and the design decisions that keep the codebase small and understandable. Why Go? Go is a natural fit for this kind of system: Goroutines and mutexes make concurrency straightforward without the complexity of async runtimes. The standard library is rich enough that zero external dependencies are needed. Compilation to a single static binary makes deployment trivial. The language's simplicity keeps the codebase readable — important for an open-source educational project.