Technologies

Trading Technologies — Languages, APIs & Protocols for Trading Software

The platform languages, general-purpose languages and connections we use to build trading software — and what each one does in trading.

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Platform technologies

Platform Languages

Native languages of trading platforms. Each one builds the tools that run inside its platform; cTrader works with C# and Python, and Quantower with C# — both covered below.

MetaTrader 4MQL4Expert Advisors, indicators, scripts and pair scanners that run inside the terminal.Explore MQL4 →MetaTrader 5MQL5Expert Advisors, indicators and services, with multi-currency testing in the Strategy Tester.Explore MQL5 →NinjaTrader 8NinjaScriptStrategies, indicators, add-ons and order flow tools built on C# inside NinjaTrader.Explore NinjaScript →TradingViewPine ScriptIndicators, strategies, screeners and the alerts that send signals to other systems.Explore Pine Script →TradeStationEasyLanguageStrategies with automated execution, indicators and RadarScreen columns.Explore EasyLanguage →thinkorswimthinkScriptStudies, scans and watchlist columns; automated orders run outside, through the Schwab API.Explore thinkScript →

What each language can automate inside its platform, and what needs an external part, is compared on our trading platforms page.

Development stack

Python, C# and JavaScript in Trading

General-purpose languages for bots, integrations, tools and dashboards — as standalone software, connected to a platform, or inside platforms that support them.

Python

Broker APIs, data & research

Used in trading for

Trading bots on broker and exchange APIs
Market data collection and processing
Strategy research and backtests
Portfolio, risk and reporting tools
Receivers for TradingView alerts

How it is used

Runs as a standalone application or service on a server or VPS, connected to brokers and exchanges through their APIs; connects to MetaTrader 5 through its official package; and runs inside cTrader, where cBots, indicators and plugins can be written in Python.

Explore Python development →

C# / .NET

Platform development & standalone applications

Used in trading for

Strategies and indicators in NinjaTrader, cTrader and Quantower
Trade copiers and multi-account tools
Desktop trade panels and utilities
Applications and services on broker APIs

How it is used

Runs inside NinjaTrader, cTrader and Quantower as their native language, or as a standalone application — for example a desktop trade panel on Windows or a background service on a server — connected to brokers through their APIs.

Explore C# development →

JavaScript

Node.js services & web tools

Used in trading for

Trading bots on broker and exchange APIs
Webhook receivers for alerts
Web dashboards and bot control panels
Custom indicators for Tradovate
Signal automation and trade copiers

How it is used

Node.js runs on a server and talks to broker APIs and signal sources, while the browser side shows dashboards and controls. Inside Tradovate, JavaScript also drives custom indicators on charts and the DOM.

Explore JavaScript development →

APIs & protocols

How Trading Software Connects

The connection decides how orders, data and signals move between your software and the market.

REST API

Request & response

Used in trading for

Placing, changing and cancelling orders
Reading balances, positions and trade history
Historical market data
Account, portfolio and reporting tools
Connecting platforms and apps to brokers

How it is used

Your software sends an HTTPS request — place an order, read a position — and receives a response. Which connections are available depends on the broker’s API, and one project can combine several ways of exchanging data.

Explore REST integration →

WebSocket API

Live streams

Used in trading for

Live prices and quotes
Order book depth
Order and fill updates
Account and position changes
Dashboards that update in real time

How it is used

One connection stays open and the server pushes updates as they happen, instead of the software asking again and again. It needs reconnection and resubscription logic for when the stream drops.

Explore WebSocket integration →

FIX Protocol

Trading sessions

Used in trading for

Order routing to brokers and venues
Execution reports and fills
Drop copy and reconciliation
Market data where it is offered
OMS and gateway integration

How it is used

A FIX engine keeps a session with the broker’s FIX API: logon, heartbeats, sequence numbers and recovery after a disconnect, with orders and executions handled over that session. Access is granted per account, often after certification.

Explore FIX integration →

Webhook

Event delivery

Used in trading for

TradingView alerts turned into orders
Signals from other tools and services
Triggers for bots and trade copiers
Notifications to Telegram or Discord
Links between no-code tools and trading systems

How it is used

The source sends an HTTP request to your server when an event happens — for example, an alert fires. The server checks the message, applies your rules and passes it on to a platform or broker API.

Explore Webhook integration →

Some brokers use their own APIs and SDKs — for example, the Interactive Brokers TWS API connects to TWS or IB Gateway through its own libraries. These are covered under Trading API Integration.

Example: how they work together

TradingViewPine Script alert→Webhookdelivers the alert→Python servicechecks rules and sizing→Broker REST APIplaces the order→WebSocketstreams the fill back

FAQ

Trading Technologies — Questions

Short answers about choosing and combining technologies.

Which technology should my project use?

It depends on where the software runs. Work inside a trading platform uses that platform’s language; standalone software uses Python, C# or JavaScript connected through broker or exchange APIs. We suggest an option after reviewing your platform, broker and task.

Can you work with our existing code and technology stack?

Yes. We can extend, fix or connect what you already run — code, platforms, servers and APIs — and keep your language and structure unless there is a reason to change them.

Do you choose the language, or do I?

If you have a preference or a team that will maintain the software, we follow it. Otherwise we propose the language that fits the platform, the broker and the task.

Can you move an existing solution to another language or platform?

Yes. Strategies, indicators and tools can be converted between platforms and languages, with the behaviour of the new version compared to the original.

Do I get the source code?

Yes. Whatever the technology, the full source code and all rights to it are handed over on delivery.

Not Sure Which Technology Fits?

Tell us your platform, broker and what the software should do. We will suggest the technology and the scope for the project.

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