Custom Expert Advisors, indicators, trade panels and automation built in MQL4 for MetaTrader 4 — the world's most widely deployed retail trading platform. From single-strategy EAs to complex multi-pair systems with advanced risk controls, delivered with full source code, strategy tester results and documentation.
MetaTrader 4 remains the most widely used retail trading platform in the world — and for good reason. Its native programming language, MQL4, gives developers full control over Expert Advisor logic, custom indicator rendering, trade panel interfaces and script-level execution. Whether you need a fully automated forex robot that trades 24/5 on a VPS, a semi-automated trade panel with one-click execution, or a complex multi-timeframe custom indicator — MT4's architecture supports it all.
Every MT4 EA we build goes through rigorous backtesting in the Strategy Tester before delivery. We optimise for real broker execution conditions — not just clean historical data — so your automated trading system performs under live spreads, slippage and requotes. PSI Square delivers full source code ownership on every project — no licensing fees, no lock-in, no recurring charges. You own everything we build, outright.
From simple single-strategy Expert Advisors to complex multi-pair trading infrastructure — every project includes full source code and documentation.
Custom MT4 Expert Advisor development in MQL4 — fully automated trading robots with custom entry and exit logic, position sizing, risk management and broker-specific execution handling.
MT4 custom indicator development for any timeframe or instrument. Multi-timeframe analysis, signal arrows, dashboard overlays and alert-based notification systems.
MT4 trade panel development — interactive dashboard EAs with one-click order execution, real-time account monitoring, risk calculators and multi-pair management interfaces.
EA backtesting and optimisation in the MT4 Strategy Tester. Walk-forward analysis, parameter sensitivity testing, Monte Carlo simulations and performance reporting.
MT4 EA bug fixing, repair and debugging. We diagnose execution errors, logic flaws, memory leaks and broker compatibility issues in existing Expert Advisors.
Migrate your MQL4 Expert Advisors, indicators and scripts to MQL5 for MetaTrader 5 — preserving all trading logic while leveraging MT5's improved execution model and multi-asset capabilities.
We build automated trading systems across all major retail and institutional environments. Explore our specialized development capabilities across other platforms.
Real projects. Real outcomes. Every system below ran on live funded accounts.
A UK-based prop firm trader needed a fully automated MT4 Expert Advisor for a scalping strategy on EURUSD and GBPUSD, with strict daily drawdown limits, trailing equity stop and automatic lot sizing — all compliant with the firm's specific funding rules.
Custom MQL4 EA with configurable entry logic, dynamic position sizing based on account equity, daily P&L monitoring with automatic shutdown on drawdown breach, and VPS-optimised execution for sub-second order fills. Delivered with full Strategy Tester backtesting results across 5 years of tick data.
Trader passed the prop firm evaluation within 3 weeks. EA deployed on live funded account with zero critical errors in the first 90 days of production trading.
Answers to the most common questions about our MT4 EA development services.
Production architectures, platform comparisons and step-by-step implementation guides from our development team.
Learn how to build an Expert Advisor that passes prop firm rules with proper drawdown, max loss and trailing equity stops implementation.
A practical comparison of MetaTrader 4 and MetaTrader 5 for automated trading — covering execution, backtesting, language differences and broker support.
Technical deep-dive into trade copier architecture, latency bottlenecks, signal replication and what to watch out for in live 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 · We reply within 24 hours · NDA available on request
