Custom automated trading robots, indicators and trade panels built in MQL4 for MetaTrader 4. Multi-pair strategies, prop firm compliance guardrails, risk management modules and MT4-to-MT5 migration — delivered with full source code, strategy tester backtesting and documentation.
MetaTrader 4 remains the most widely deployed retail trading platform in the world. Its widespread broker adoption, low system requirements and mature MQL4 ecosystem make it the platform of choice for thousands of retail traders, prop firm participants and signal providers globally.
We build custom MT4 Expert Advisors, indicators and trade panels in MQL4 — from single-strategy EAs with clean, reliable execution logic to complex multi-pair systems with advanced risk controls and custom dashboards. Every MT4 EA we deliver includes full source code ownership, strategy tester backtesting results and setup documentation. No licensing fees, no recurring royalties, no lock-in.
From single-strategy EAs to complex trade panels — every project includes full MQL4 source code, backtesting and documentation.
We build automated trading systems across all major retail and institutional environments. Explore our specialized development capabilities across other platforms.
Real systems. Real market conditions. Every EA delivered with full source code.
A client trading a $100k FTMO challenge needed an automated system that could trade 4 forex pairs simultaneously without exceeding the 5% daily drawdown limit or the 10% maximum total loss threshold. Manual trading was causing emotional errors during London-New York overlap.
Built a custom multi-pair MQL4 EA with a centralized risk management engine that monitors equity across all open positions. The EA calculates lot sizes dynamically based on account equity, enforces hard daily drawdown cutoffs, and includes a high-impact news filter via calendar API.
The client passed Phase 1 and Phase 2 within 6 weeks, staying within all drawdown limits. The EA is now running on their funded account with consistent risk-adjusted returns.
Answers to the most common questions about our MT4 EA development services.
Production architectures, platform comparisons and step-by-step implementation guides from our quantitative engineering team.
A practical developer comparison between MT4 and MT5 covering execution models, multi-currency backtesting, 64-bit performance, and platform migration.
Learn how to build trading algorithms that pass prop firm rules with daily loss thresholds, high-water mark trailing stops, and news filters.
Technical deep-dive into copier architecture, latency bottlenecks, order replication, and risk management in multi-account deployments.
Whether you need a simple Expert Advisor or a complex multi-broker trading infrastructure — tell us what you're building. We'll scope it, design it and deliver it to production standard. Most projects start within 5 business days.
Or email info@psi-square.net · Phone +44 (0) 20 3872 7195 · We reply within 24 hours · NDA available on request
