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Automate Repetition, Reclaim Your Time: Brawler System Backtesting Automation

[Introduction: The Secret of the World’s Greatest Quant Firm – Automation]  

Peter Brown, CEO of Renaissance Technologies—the world’s most successful quant hedge fund—shared an intriguing insight in a recent podcast interview. 
He emphasized that upon taking the helm, one of his top priorities was the "automation of every single process."

What struck me most was his mention of how test automation played a pivotal role in that journey. In the world of system trading, the reliability of a strategy is ultimately determined by countless rounds of rigorous testing.


[The Problem: The Trap of Manual Repetition] 

Since I run "Brawler System Trading" as an individual, I don’t have much to deal with in terms of corporate accounting or finance. 

However, I realized that "backtesting" was an area ripe for automation. While the daily data collection and processing were already automated, extracting backtesting results and manually transferring them to Excel to calculate indicators remained a manual chore. 

Testing 10 different stocks—5 times each—meant 50 repetitive manual tasks. 

Even though it was "simple" work, it required high concentration, limiting my output to just 5 stocks per hour.


[The Solution: 2 Hours of 'Vibe Coding' with Gemini] 

To break this cycle of tedious repetition, I once again turned to an LLM (Gemini 3.1 High). This time, I provided highly specific guidelines. 

I gave detailed prompts such as, "Enter data only up to this specific column in Excel, and do not touch the columns containing pre-set formulas.

" Through about two hours of what is now called "Vibe Coding," I worked through the complex logic step-by-step.


[The Result: Shrinking an Hour of Work into 10 Minutes] 

Now, I simply enter the ticker symbol and hit execute—everything is saved automatically. The results are remarkable:

  • Weekly Checks: The task of verifying if backtest results align with the actual alpha logic orders has been slashed from 1 hour to just 10 minutes.

  • Monthly Tuning: I expect the time spent on fine-tuning parameters every month to be drastically reduced as well.


[Conclusion: Reinvesting Saved Time into What Matters] 

Vibe Coding has done more than just write code for me; it has created an "automated assistant" that works on my behalf. 

With the time I’ve regained, I plan to focus on reading and deepening my insights into the market. 

Letting the system run itself while I, the human, focus on fundamental questions—that is the essence of the "smart trading" I strive for.


Reference Video : A conversation with Renaissance Technologies CEO Peter Brown




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