CASE STUDY · Next.js + Node.js SaaS · 2026
PineTrader
An end-to-end trading automation SaaS bridging TradingView strategies to MetaTrader 5 execution with sub-second latency.
Sub-second
- PineTrader
- Fintech / Trading automation (SaaS)
- Next.js + Node.js SaaS
- Next.js, Node.js, Express, MQTT, MetaTrader 5, Stripe, React Flow, WebSocket
- 2026
- Custom web apps & SaaS
The brief
PineTrader needed a complete SaaS platform connecting two ecosystems that don't natively talk to each other: TradingView, where traders write strategies, and MetaTrader 5, where many brokers execute orders. The bridge had to be reliable, low-latency, and chargeable as a tiered subscription.
What we did
- Built the full platform as Next.js (frontend) plus Node.js/Express (backend).
- Built a React Flow visual strategy builder for users who prefer node-based logic over Pine Script.
- Added AI-assisted Pine Script generation from natural-language prompts.
- Built MQTT infrastructure for low-latency automation between TradingView, the platform, and MT5.
- Added a WebSocket layer for live execution feedback, and Stripe tiered subscription billing.
How we built it
The architectural challenge was latency, a signal that fires 30 seconds late is worthless. We used MQTT as the transport layer between subsystems: a TradingView webhook hits an HTTP endpoint, which publishes onto a topic consumed by a worker that talks to the user's MT5 connection; fills publish to a different topic picked up by a WebSocket server that pushes to the browser in real time. The visual builder uses React Flow, indicator, condition, and action nodes compile to a Pine Script deployable to TradingView in one click. Stripe enforces plan-gated limits at the API layer.
For non-technical users, the AI prompt input ("if RSI is below 30 and the 50-day MA crosses above the 200-day MA, place a long order with a 2% stop loss") generates the same node graph the visual builder produces, so both authoring paths converge on one deployable strategy representation.
The result
PineTrader is live as a subscription SaaS. End-to-end latency from TradingView signal to MT5 order is sub-second under normal conditions, and the AI-assisted authoring path is the strongest acquisition channel, traders sign up to try natural-language strategy building, then convert for higher-tier execution limits.
Sub-second
Tech stack
- Next.js
- Node.js
- Express
- MQTT
- MetaTrader 5
- Stripe
- React Flow
- WebSocket
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