Algorithmic trading
development
We build custom trading systems, Expert Advisors, indicators, trade copiers and fully automated strategies for traders, prop firms, hedge funds and fintech startups. From a single MT4 EA to complete multi-broker trading infrastructure — delivered to production standard.
Popular trading solutions
Browse our most requested services — or book a call and tell us exactly what you need.
End-to-end algorithmic trading solutions
We don't build demo bots. We build live trading infrastructure — designed for real accounts, real brokers and real market conditions.
Platforms we specialise in
We have production experience across all major trading platforms. Click below to explore our capabilities and services.
MT4 development — MetaTrader 4
MetaQuotes MT4
MetaTrader 4 remains the more widely deployed retail trading platform in the world. We build custom Expert Advisors, indicators, scripts and trade panels in MQL4 — from single-strategy EAs with straightforward logic to complex multi-pair systems with advanced risk controls and custom dashboards. Every MT4 EA we deliver includes full source code, strategy tester results and documentation.
Services
MT5 development — MetaTrader 5
MetaQuotes MT5
MetaTrader 5 offers multi-asset support, improved order types, faster execution and a more powerful MQL5 language. We build sophisticated systems including multi-symbol EAs, arbitrage strategies, hedging systems and broker-specific integrations. Our team has deep production experience with MT5's execution model, filling modes, error handling and the real-world behaviour of live brokers — not just the documentation.
Services
NinjaTrader 8 development
NinjaScript & Futures
NinjaTrader 8 is the platform of choice for futures traders and US market participants. We build NinjaScript automated strategies, custom indicators, ATM strategy integrations and data feed connections for NinjaTrader 8 — including live account deployments and Market Replay-compatible builds for strategy validation.
Services
TradingView Pine Script development
Pine Script v5
TradingView has one of the largest retail trading communities in the world and Pine Script is its native language. We build custom indicators, strategy scripts, screeners and alert systems — including webhook-based automation that connects TradingView alerts directly to live MT4, MT5 or broker execution with zero manual intervention.
Services
cTrader / cAlgo development
C# ECN Systems
cTrader is growing rapidly among ECN brokers and algorithmic traders who need transparent, fair execution. We build cBots and custom indicators in C# for cTrader and cAlgo — including risk management tools, multi-account trade copiers and strategy migrations from MT4 or MT5.
Services
Python trading systems
Custom API & Engines
For traders and institutions who need execution capability beyond retail platforms — we build Python-based systems including live execution engines, backtesting frameworks, broker API integrations (Interactive Brokers, Alpaca, Binance, OANDA and others) and real-time data pipelines. Clean, documented, production-ready code delivered with full ownership.
Services
FIX API & institutional integrations
Institutional Standards
FIX Protocol is the global standard for institutional-grade broker connectivity. We build FIX API integrations for direct broker connections, low-latency execution systems and prime brokerage integrations — for firms that have outgrown retail platform limitations and need the speed, reliability and control of direct market access.
Services
Trading systems we've delivered
Real projects. Real outcomes. Every case study below ran on live funded accounts.
Case 1 — Multi-symbol arbitrage EA (MT5)
Problem
A UK prop firm needed automated execution across 10 correlated currency pairs with sub-millisecond speed, dynamic risk control and zero tolerance for execution errors under live broker conditions.
Solution
Custom MQL5 EA with global tick caching, 10 configurable trade sets, automatic fill mode detection (FOK/IOC/RETURN) and comprehensive error handling. Refactored architecture eliminated copy-paste code blocks and reduced latency significantly.
Outcome
Deployed on live funded accounts within 3 weeks. Zero critical errors in the first 60 days of live trading.
Case 2 — MT5 trade copier for signal provider
Problem
A signal provider needed real-time trade replication across 100+ client accounts on multiple brokers, with configurable lot scaling per account and a subscriber management dashboard.
Solution
Custom MT5 trade copier with broker-agnostic architecture, per-account risk settings and a web-based dashboard for subscriber management and performance monitoring.
Outcome
Sub-second execution across all accounts. Provider scaled from 40 to 120 active subscribers within 90 days of launch.
Case 3 — NinjaTrader 8 futures strategy
Problem
A US-based futures trader had a proven mean-reversion strategy on ES and NQ running manually. Needed full automation with dynamic trailing stops, session-based risk filters and reliable variable persistence across trading sessions.
Solution
NinjaScript automated strategy with ATM integration, configurable session time filters, dynamic trailing stop logic and file-based variable persistence to maintain state across platform restarts.
Outcome
Fully automated and running live. Trader reports consistent, precise execution with no manual intervention required during US market hours.
Why serious traders work with PSI Square
Four pillars of institutional-grade algorithmic engineering.
Deep trading engineering experience
We understand execution logic, broker latency, filling modes, risk models and the real behaviour of live markets — not just how to write code. Our team trades and builds, which means we catch problems before they reach your account.
Production-grade systems only
We don't build demo bots or proof-of-concept scripts. Every system we deliver is designed for live account conditions — tested against real broker environments, real spreads and real execution delays.
End-to-end ownership
Strategy design → system architecture → development → backtesting → live deployment → ongoing support. We cover the full lifecycle, so you're not stitching together work from multiple developers.
You own everything, always
Full source code ownership from day one. NDA available as standard. No licensing fees, no vendor lock-in. If you want to take the code to another developer tomorrow, you can — though most clients don't.
How we work
A structured, milestones-driven engagement framework designed for speed and corporate trust.
Is this the right fit for you?
We work best with clients who know what they want and value quality over speed-to-cheap.
This is a strong fit if you:
VERIFIED COMPATIBLE- Have a defined trading strategy you want automated or improved
- Are building or scaling a prop firm, fund or signal service
- Need a system that runs reliably on live funded accounts
- Value clean code, thorough testing and proper documentation
- Want a long-term development partner, not a one-off hire
Probably not the right fit if you:
POTENTIAL MISALIGNMENT- Don't have a defined strategy and want us to create one speculatively
- Are looking for a guaranteed profitable system — no one can promise that
- Need something built in 24 hours with no written specification
- Are primarily comparing on price rather than capability and track record
Not sure? Book a free call. If we're not the right fit, we'll tell you honestly — and point you in the right direction.
What traders say about working with us
Real feedback sourced directly from verified clients, Direct NDA projects, and live system deployments.
"PSI is an artist. With my project, it was very complex and multi time frame and PSI was able to take everything I wrote out / showed on a meeting call, and translated it into an efficent EA on MT5. Thank you PSI 🙏"
Frequently asked questions
Find immediate answers regarding custom indicators, platforms, backtesting, and source code ownership.
How projects are priced
Every trading system is scoped individually — because a single-strategy EA and a full prop firm trading infrastructure are completely different engagements. We don't publish fixed rates because we don't want to underprice complex work or overprice a simple request.
Book a free 30-minute consultation. We'll understand exactly what you need and send you a detailed quote within 24 hours.
Ready to build your trading system?
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