My Trading Bot Skipped 28 Trades Because I Ignored Volatility on a Tiny Real-Money Budget

Description and use

The trading bot missed 28 trades due to budget miscalculations and ignored volatility. Rewriting sizing logic with volatility‑based allocation and realistic budget, plus automated checks and manual code review, restored proper operation.

Problem

A trading bot failed to execute trades due to mis‑calculated budget constraints and ignored market volatility, causing 28 missed opportunities and 77% idle time.

Outcome

The bot now operates within a realistic budget, respects volatility differences, and avoids missed trades. Automated checks catch silent failures, while manual code reviews prevent accidental state loss.

Workflow

• 1. Build a monitoring script (daily_check.py) to log bot activity each night.
• 2. Run the script to identify missed trades and budget exhaustion.
• 3. Analyze correlation and risk imbalance among symbols.
• 4. Rewrite position sizing to use volatility‑proportional slices and a realistic total cap.
• 5. Implement a security gate (security_gate.py) and manual review process for code changes.
• 6. Deploy updated bot logic (run.py) and re‑enable scheduler.
• 7. Continuously monitor with daily_check.py and review logs.

Evidence

The bot was trying to enter all four symbols at once because they are highly correlated. When SPY and QQQ signaled a buy, the $40 budget was gone.

Source

I had to rewrite the entire sizing logic to fit into a much smaller shoebox.

Source