Petr Kostal
Petr Kostal
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Algorithmic trading developer (MQL5 / MQL4) at Osvc
Petr Kostal — algorithmic trading developer, Czech Republic.

I trade on live accounts myself, so I build EAs the way I'd want to run them.

What I build:
• Expert Advisors and indicators for MetaTrader 4 and 5 (MQL4 / MQL5)
• A written strategy turned into a configurable EA — everything adjustable sits in the inputs
• Risk management: ATR stops, break-even, partial closes, trailing, daily loss limits, drawdown protection, prop-firm rule sets
• Fixing, auditing and explaining existing EA code, including code from AI tools and no-code builders
• Backtesting and optimisation in the Strategy Tester on real tick data

Also:
• Python — MT5 bridges, data analysis, backtesting tools, log and latency analysis
• C++ — MQL is C++ based; I work in both

How I work: I ask before I code. You get the full source, commented and unlocked. I test on real ticks before I hand it over. If I think your idea won't do what you expect, I say so first.

I don't promise a profit factor, a win rate or a monthly return. Nobody can do that honestly.

You can check my work: two EAs in the MQL5 Market — Gorilla UltimateBeast Forex and GorillaBeast ScalperPro Gold2 — and a MetaTrader 5 signal, ThreeD Bet Forex MAX, running on a real account since March 2026. More EAs are in development.

I'm new to Freelance and my rating here is empty. I'd rather say that than hide it.
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Petr Kostal
Published code Trade Guardian - stop loss watchdog and drawdown limiter that re-arms
A safety EA that watches every open position on the chart symbol: it reports any position left without a stop loss, optionally attaches an ATR-based stop, and enforces a daily and a total drawdown limit that re-arms after a cooldown.
Petr Kostal
Published code Position Peak Logger - how far your trades actually travelled, in R
Records the maximum favourable and adverse excursion of every position in R multiples and writes one CSV row per closed trade.
Petr Kostal Published product

GorillaBeast GOLD 2 — Power. Precision. Profit. 🦍 Gold (XAU/EUR) is living through the wildest years in its history. Prices have surged to record highs of around €4,300–4,500 per ounce , with banks like Goldman Sachs and J.P. Morgan forecasting further gains toward €4,600+ . With it came extreme volatility — sharp spikes, widened spreads, geopolitical shocks. This is exactly where ordinary systems fail. GorillaBeast GOLD 2 was tested over the demanding period of 2023–2026 (98% real ticks) —

Petr Kostal Published product

Gorilla Ultimate Beast Forex is an automated trading system (EA) for MetaTrader 5 , designed for fully rule-based trading on forex instruments without the need for manual intervention. Transparency is important to me, which is why the performance and ongoing statistics are available from a real account via independent Myfxbook monitoring. The EA is intended for traders who want clearly defined entry/exit rules and the ability to run a more conservative or more dynamic approach depending on their

Petr Kostal Published MetaTrader 5 signal
ThreeD Bet Forex MAX
Price: 50 USD, Growth: 61.61%
Automated mean-reversion grid strategy trading 8 currency pairs simultaneously on H1 timeframe. The system exploits statistical price deviations from the mean — systematically buying oversold and selling overbought levels. No emotions. No hesitation. Pure logic, 24/5. *14-month backtest (2025–2026) confirmed an average annual return of +135% with a maximum portfolio drawdown of just 16%. Every pair is strictly filtered — only instruments with DD below 10% and Sharpe ratio above 2 make the cut.*
Petr Kostal
Registered at MQL5.community