MT5 EA Programmer: Build or Port a Custom Expert Advisor

A prop-challenge trader in Dubai has a TradingView strategy that has passed three demo evaluations. The funding firm only accepts MetaTrader 5. He hires an MT5 EA programmer off a freelance marketplace, gets a compiled EX5 back in four days, runs it on the challenge account, and watches it enter trades a full candle late because the freelancer eyeballed the Pine Script instead of matching it bar-for-bar. The challenge fee is gone, and so is the week.

That gap between "the code compiles" and "the code trades exactly like the original" is where most EA builds fail. It is not usually a coding problem — it is a verification problem. The EA runs, produces trades, looks plausible on a backtest, and no one checks it against the source strategy on the same data and the same period before it goes live.

This guide covers what a proper MT5 EA build or Pine-to-MT5 port should include, what it costs, how long it should take, and what to prepare before you brief anyone. Bharat AI Saathi's build is on the offer page if you want the specifics while you read.

What MQL5 Expert Advisor Build & Pine-to-MT5 Port actually does

This is a fixed-scope build service, not an hourly coding job. You bring either a written strategy (entry/exit rules, indicators used, risk logic) or an existing TradingView Pine Script, and you get back an MQL5 Expert Advisor built specifically for MetaTrader 5 — not a generic bot with your parameters bolted on.

The core of the service is the signal-parity report: a side-by-side comparison of trade signals from the TradingView version and the MT5 version, run on the same symbol, same timeframe, and same historical window. This exists because Pine Script and MQL5 handle bar closes, repainting, and indicator lookback differently. An indicator that looks identical on both platforms can still fire signals a bar apart if the port isn't done carefully. The parity report is what tells you — before you fund an account — whether the MT5 version is trading the same strategy or a slightly different one.

Alongside the EA itself, the build includes a risk module (lot sizing, stop-loss/take-profit, breakeven, trailing stops, a daily loss cap, and a news filter), a Strategy Tester report, and a short demo forward-test period before you're asked to trust it with real capital.

How it works, step by step

1. Kickoff call or written brief. You describe the strategy, or share the Pine Script and your MT5 account/broker details (symbol names and specs vary by broker, which matters for exact parameter matching).
2. Scope confirmation. We confirm whether this is an indicator port, a full strategy, or a multi-symbol/risk-guard build, and lock the fixed price against that scope.
3. Build phase. The EA is written in MQL5, with inputs mapped to match your Pine parameters where a port is involved (period, source, offset, and any custom function logic).
4. Backtest and parity check. The EA runs in MetaTrader 5's Strategy Tester against historical data; signals are logged and compared against the TradingView output for the same period.
5. Parity report delivered. You receive the comparison document, the MQ5 source, the compiled EX5, and the Strategy Tester report.
6. Demo forward-test. The EA runs on a demo MT5 account for a short window so you can watch live behavior — fills, slippage handling, alert delivery — before going live.
7. Go-live and ongoing care. You deploy to your live or challenge account. If you're on the care plan, we monitor for MT5 build updates, broker symbol changes, and handle re-optimisation requests monthly.

Customer: The Pine script uses ta.crossover on a 21/55 EMA with an ATR-based trail. Can this run on MT5 exactly the same way? Agent: Yes — we'll rebuild the crossover logic in MQL5 using iMA handles and match the ATR trail using iATR. Once built, we run both versions over the same 90-day window on your broker's price feed and send you the signal-by-signal comparison before you touch a live account. Customer: What if they don't match? Agent: Then we adjust the port — usually a bar-close or lookback offset difference — and re-run the comparison until signals align, or we flag exactly where and why they diverge so you can decide if it's acceptable.

Before and after

What it costs and what is included

There is no lock-in — you own the MQ5 source and EX5 file outright, and can stop the care plan at any time. The payback logic is straightforward: a single missed or duplicated trade from a mismatched port can cost more than the setup fee once, and a daily loss cap that actually works removes one of the more common ways a funded account gets breached over a full challenge cycle.

Delivery timeline

Day 0 — Kickoff

Brief submitted, scope and price confirmed, broker/symbol details collected.

Day 1–4 — Build

MQL5 development, parameter mapping, initial backtesting against historical data.

Day 5 — Parity and risk module

Signal-parity report generated and reviewed with you; risk module (SL/TP, trailing, loss cap, news filter) wired in and tested.

Day 6 — Demo forward-test

EA runs on a demo MT5 account; alerts and dashboard checked for correct delivery.

Day 7 — Go-live

MQ5 source, EX5, Strategy Tester report, and parity report delivered; EA deployed to your live or challenge account.

What you need to have ready

• MetaTrader 5 account credentials (demo is fine for the build/test phase) and your broker's exact symbol names
• The Pine Script source (if porting) or a written description of entry/exit rules, indicators, and timeframe
• Historical data range you want used for the parity comparison
• Risk parameters: max daily loss, position sizing rules, any prop-firm-specific constraints (e.g., max lot size, no overnight holding)
• Telegram bot token or channel details if you want alert delivery
• Confirmation of whether this EA will run on a personal account, a prop-firm challenge, or a signal-provider setup — each has different compliance and risk-cap requirements

Doing it yourself vs done-for-you

Compliance and risk notes

• Prop-firm and broker terms vary on automated trading — check your specific firm's EA policy before deploying, especially on challenge accounts.
• Trading involves risk of loss; nothing in an EA build, backtest, or parity report is investment advice or a guarantee of future performance.
• If the EA sends signals to third parties (Telegram groups, other traders), confirm you have the right to redistribute the underlying strategy logic, particularly if it was originally licensed or purchased.
• Data residency and retention for any historical price data or trade logs used in testing should follow your own record-keeping obligations, especially if you operate as a regulated signal provider.
• Account-locked licensing (optional) restricts the EA to a specific MT5 account number — useful if you plan to resell access to the strategy, but confirm this fits your jurisdiction's software licensing norms.
• This guide and the underlying service do not constitute legal, tax, or financial advice; consult a qualified professional for your specific situation.

Mistakes buyers make

• Skipping the parity check. A backtest that "looks fine" on MT5 alone doesn't prove it matches the original Pine strategy — always compare signal-by-signal against the source.
• No demo forward-test before going live. Backtests don't reveal execution issues like slippage handling or alert delivery failures; a short demo run catches these first.
• Underspecifying risk rules. "Add a stop-loss" isn't enough — give exact daily loss caps, max position sizes, and any prop-firm-specific constraints upfront.
• Ignoring broker symbol differences. Gold might be "XAUUSD" on one broker and "GOLD" on another, with different pip values — confirm exact symbol specs before the build starts.
• No plan for MT5 build updates. MetaTrader updates its build periodically, which can break EAs that aren't maintained — a care plan or your own monitoring routine avoids silent failures.

FAQ

Can you port any Pine Script strategy to MT5?

Most standard Pine Script strategies using common indicators (moving averages, RSI, ATR, MACD, etc.) can be ported directly. Highly custom Pine functions or strategies relying on TradingView-specific features (like certain security() calls across multiple timeframes) may need adaptation, which we'll flag during scoping.

What does the signal-parity report actually show?

It's a comparison of trade entry/exit signals generated by the TradingView version and the MT5 version over the same historical period and symbol, so you can see exactly where — if anywhere — the two diverge before risking capital.

Do I need to know MQL5 to use this?

No. You receive the compiled EX5 file ready to attach to a chart in MetaTrader 5, plus the MQ5 source if you or another developer want to review or modify it later.

Will this work for prop-firm challenges?

Yes, as long as the prop firm's rules permit automated trading — check their specific EA and news-trading policies first, since firms vary and some restrict automation entirely.

What happens if my broker changes symbol specs later?

Under the care plan, broker or symbol changes are covered as part of the monthly maintenance; without it, you'd need to request an update separately.

How is this priced compared to a freelance MQL5 coder?

Freelance marketplace pricing is often lower upfront but rarely includes a formal parity report, a built-in risk module, or a demo forward-test — those are usually separate asks, if offered at all, and typically add cost and time once you realize they're missing.

Next step

Send us your Pine Script (or a written description of your strategy rules) along with your broker and symbol details, by email at support@bharataisaathi.com or on WhatsApp at https://wa.me/917735268199. We'll confirm scope and price within one business day. Full process details are on the how we work page, and the build itself is described on the offer page.