Claude Code builds a C++ trading server on an order management engine in 19 minutes (uncut) | Reamer Server
Claude Code (Claude Sonnet, medium effort) is given the Reamer Server kit and nothing else, and asked to build a trading server in C++: its own pre-trade gate and its own broker connector, a FIX 4.4 session ported from the kit's Go reference, linked into the core and run to fills against the kit's simulated venue. Total time: about 19 minutes on the wall clock, top right of the screen. The result: 6 orders submitted, 5 filled across AAPL, SPY and QQQ, and 1 rejected by the gate with its exact reason, confirmed through the metrics endpoint.
Chapters
Chapter times are video time. The recording is sped up; the wall clock in the frame shows real elapsed time.
- 0:00The task
- 0:20Verify the kit, activate, read the C header
- 1:00Run the reference end to end
- 1:20Event bus, wire protocol and config
- 2:00Planning the C++ layout
- 2:20FIX 4.4 message codec and session
- 3:00Broker connector
- 4:40Checking struct layouts against the header
- 5:40Gate: allowlist and position limit
- 6:00Event bus reader and strategy client
- 6:40main(), Makefile and build
- 7:40Live run against the simulated venue
- 8:00Debugging the event tail
- 8:40Verified end to end
- 9:00Summary
- 9:20Issues found, licence deactivation
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