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Written for traders who want the mechanics, not motivation. Mostly about the ways a strategy can look profitable on screen and lose money in an account.
Strategy builders are the right answer for a lot of traders. This is a precise account of where their ceiling sits — the five walls people hit, what custom work actually costs, and when you should not hire anyone at all.
Six causes, ranked by how often they turn out to be the culprit — look-ahead bias, missing costs, sample size, regime change, execution assumptions and plain curve fitting. With a way to diagnose which one is yours.
Brokerage, STT, exchange transaction charges, GST, SEBI turnover fee and stamp duty — worked through on an actual Bank Nifty options round trip, and what it does to a strategy that looked profitable without them.
The three patterns that let a script see the future — unclosed bars, careless request.security() calls, and mutable series — plus the fix for each and how to prove your script is clean.
Free review within 12 hours. You'll get an honest read on whether it's worth testing at all.