Hire an MQL4 developer to write Expert Advisors, indicators and scripts for MetaTrader 4 — or to modify, debug, optimize and extend the MQL4 code you already have.
From trading rules or existing source code to Expert Advisors and indicators that run reliably on your account.
Nordman Algorithms writes MQL4 code for traders, signal providers and trading software vendors who work on MetaTrader 4. Our MQL4 developers start from what you have — trading rules, a written specification or just a plain description, existing .mq4 source, or a project another developer left unfinished — and turn it into Expert Advisors, indicators and trading tools, or into a corrected and extended version of your current code.
Every Expert Advisor, indicator and tool is written for the conditions it will actually run in: your broker’s symbols and trading rules, your account type, terminal restarts and orders the broker rejects. Source code and full IP ownership are transferred on delivery.
input double RiskPercent = 1.0; // risk per trade, %input int StopLossPips = 25; // stop-loss distancevoid OnTick(){ double lots = LotsByRisk(RiskPercent, StopLossPips); if(BuySignal()) OrderSend(Symbol(), OP_BUY, lots, Ask, 3); OrderSend(Symbol(), OP_BUY, lots, Ask, 3, StopLoss(), 0);}'OrderSend' — wrong parameters count
1 error, 0 warnings
compiling 'RiskGuard.mq4'…
0 errors, 0 warnings
Expert Advisors, indicators and trading tools for MetaTrader 4, written by our MQL4 programmers from your rules.
Automated strategies that open, manage and close trades by your rules.
Calculations, signals, levels and alerts on the chart, or for an Expert Advisor to use.
One-click actions and small tools that run once on a chart and finish.
On-chart panels, trailing and break-even, partial closes and risk controls for manual trading.
An MQL4 developer working on the Expert Advisors, indicators and scripts you already have — modifying, fixing, optimizing, connecting and converting them.
New inputs, rules, filters and functions added to existing .mq4 source — including code written by another developer — without breaking what already works.
Compilation errors after MetaTrader updates, orders rejected by the broker and indicators that repaint — traced to the cause in the code and fixed. Where Strategy Tester and live results differ, we find out why, fix code errors and take execution conditions into account.
Slow indicators and heavy Expert Advisors made lighter, and tangled code restructured into clear modules and shared .mqh files that can be maintained and extended.
Expert Advisors and indicators connected to the outside world: HTTP requests to REST services, DLLs for C# or native code, and data exchange with Python applications.
MQL4 code moved to MQL5 with matching behaviour, or trading logic from Pine Script and other platforms rebuilt in MQL4, with results compared side by side.
Send a description of what you need, and the .mq4 and .mqh files if there is existing code — we will review it and tell you what it would take.
Larger MetaTrader 4 projects often split the work: MQL4 handles trading inside the terminal, while external applications and services take on analysis, data and reporting.
Models, heavy calculations and custom interfaces run in an external application; the Expert Advisor receives the result and trades on it.
Data and signals exchanged with external services through a connecting component suited to each — requests, live streams or incoming alerts.
Trades and account data stored outside the terminal and shown in dashboards and reports.
We agree the rules, the scope and the acceptance checks with you before any code is written.
Send a description of the rules or the change you need. If the project builds on existing code, include the .mq4 and .mqh source files.
Receive the .mq4 source and compiled .ex4 file, settings presets, a Strategy Tester report where relevant, and a guide to every input. We walk through the specified behaviour and provide technical support under the agreed terms.
Work with MQL4 programmers who build MetaTrader 4 software every day.
Clear structure and clearly named inputs, so the code stays usable after delivery — by us, by you or by another developer.
We build and sell MT4 indicators and trade copiers ourselves, so MetaTrader 4 behaviour is familiar ground.
See our MT4 products →Requirements, deliverables, fixed price and acceptance examples are agreed before development begins.
An NDA is available on request. Source code and full IP ownership are transferred on delivery.
Installation help, input explanations and technical answers within the agreed support scope.
Feedback from clients across our custom trading software projects.
Practical answers about MQL4 code, existing Expert Advisors and MetaTrader 4.
Yes. We go through the existing .mq4 source first to understand how it works, then make the changes without breaking what already works.
Yes. We go through what has been built so far, list what works and what is missing or broken, and agree the remaining scope before continuing — so you know exactly what you are paying for.
We do not decompile compiled files. If you still have the trading rules, settings or examples of how the Expert Advisor behaved, we assess whether it can be recreated from them — and if it can, you receive clean source code that you own.
It depends on your broker, the features you need and how the strategy is built. We can convert the code and check that the MQL5 version behaves the same as the original.
We find the cause first. Common ones are logic that uses a bar before it has closed, broker conditions the test did not reproduce, and spread or execution differences. Code errors are fixed, and execution conditions are taken into account in the logic where possible.
Yes. You receive the .mq4 source, the compiled .ex4 file, settings presets and instructions. Source code and full IP ownership are transferred on delivery.
A description of the rules or the change you need, and the .mq4 and .mqh source files if the project builds on existing code. Screenshots and settings help as well.
Send your trading rules, or the .mq4 code and what should change. We will review it and outline a practical scope for your MQL4 project.