Building Your First Systematic Strategy

You’ve covered a lot of ground in Path 2. You know why rules beat gut feeling (2.1). You understand the five major factors (2.2). You can read risk metrics (2.3) and evaluate a backtest honestly (2.4). Now it all comes together.

This module walks through the complete process of building a systematic strategy from scratch, every decision you need to make, the tradeoffs involved, and what it looks like in practice on RupeeCase. By the end, you’ll have a clear mental model for strategy design that applies to everything from a simple momentum screen to a sophisticated multi-factor portfolio.

The five decisions in every systematic strategy

Every systematic equity strategy, no matter how simple or complex, requires five design decisions. Get these right and you have a strategy worth backtesting.

A complete strategy specification

Here’s what a properly documented strategy specification looks like. Every decision is explicit. Nothing is ambiguous.

This specification is complete. Any programmer given this document would build exactly the same strategy. That’s what systematic means, no ambiguity at execution time.

Evaluating your backtest honestly

The most important thing: stick to it

I’ve spent most of Path 2 on the intellectual work of strategy design. But in 17 years of trading, the biggest source of return destruction I’ve observed isn’t bad strategy design. It’s good strategy design abandoned at exactly the wrong moment.

Every momentum strategy has stretches, sometimes 6 to 12 consecutive months, where it underperforms the index. The portfolio is doing everything right: buying the highest-momentum stocks, rebalancing consistently. But momentum is in a “crash phase” and the strategy is down 20% while the market is flat.

This is when most investors abandon the strategy. And it’s almost always the worst time to do so, the subsequent recovery is often sharp. The investors who stick with the process through the bad periods capture the good ones.