Building your own trading infrastructure is a respectable choice, and for some people it’s the right one. This isn’t an argument that DIY is wrong. It’s an argument that for a lot of systematic traders, it’s the wrong default, chosen out of habit or pride rather than a real assessment of the trade.
What DIY actually costs
The appeal of DIY is control, and the control is real. But the bill comes in a currency people underestimate: your time, indefinitely.
You don’t build a trading system once. You build it, then you maintain it. The broker API changes. A data edge case appears. The host falls over during a session. A calendar bug surfaces six months in. Every piece you built is a piece you now own forever, and most of those pieces are not where your edge lives. They’re plumbing, necessary, unglamorous, and roughly identical to everyone else’s plumbing.
What you’re really trading
So the honest framing of build-vs-buy isn’t “control vs convenience.” It’s:
- DIY: maximum control, and a standing commitment to build and maintain infrastructure that doesn’t differentiate you.
- Managed: less control over the internals, and your time back to spend on the strategy.
For someone whose edge is a strategy and whose scarce resource is time, that’s not a close call. The infrastructure is undifferentiated work; paying someone else to keep it running is the same logic as not running your own email server.
When DIY is still right
It genuinely is sometimes:
- You have a requirement no platform exposes, a custom engine, an exotic data source, unusual execution logic.
- The infrastructure is your edge, or your business.
- You specifically want to own and control every layer, and you’ve counted the cost.
If one of those is true, build. The mistake isn’t building, it’s building by default, without admitting that most of what you’re building is the same plumbing everyone else maintains, and that your strategy doesn’t care who wrote it.
The reframe
The question to ask isn’t “can I build this?” Most competent engineers can. It’s “is building and maintaining this the best use of my time, given that it won’t make my strategy any better?” For a lot of systematic traders, answered honestly, the answer is no, and that’s the whole case for a managed platform.