We build software,
trading systems, AI
agents that perform
PSI Square is a specialist development firm with 10+ years of experience delivering algorithmic trading platforms, AI-powered automation, SaaS products, and custom web & mobile applications. Trusted by traders, prop firms, startups and businesses worldwide.
What we build
Three specialist practices. One team. All delivered to production standard.
Algorithmic trading development
From simple MT5 Expert Advisors to complex multi-symbol arbitrage systems and prop firm infrastructure — we build trading technology that runs live on funded accounts.
- MT4 & MT5 Expert Advisors
- NinjaTrader 8 strategies
- TradingView Pine Script
- cTrader / cAlgo development
- Python trading systems
- Trade copiers & signal automation
- Risk management systems
- FIX API & broker integrations
AI agents & automation
We build AI agents that work around the clock — handling inbound calls, qualifying leads, processing documents and automating workflows that used to take your team hours every day.
- AI voice agents (inbound & outbound)
- AI SDR & appointment setters
- AI customer support agents
- n8n / Zapier / Make.com workflows
- CRM & ERP automation
- AI document processing
- OpenAI & Claude integrations
Custom software development
Production-grade custom software applications built with modern stacks. SaaS platforms, AI-powered products, React Native apps and Next.js systems — designed to scale from day one.
- Next.js web applications
- React Native mobile apps
- SaaS platform development
- AI chatbot integrations
- OpenAI-powered products
- Trading dashboards & portals
- Internal business tools
Work that speaks for itself
Real projects. Real outcomes. Scroll or sort to explore our work.
Multi-symbol arbitrage EA
Problem: A UK prop firm needed automated execution across 10 correlated currency pairs with zero latency and dynamic risk control.
Solution: Custom MQL5 EA with global tick caching, configurable trade sets, and automatic fill mode detection (FOK/IOC/RETURN).
Live on funded accounts within 3 weeks. Zero critical errors in first 60 days of live trading.
AI voice agent for service business
Problem: A UK service business was missing inbound enquiry calls after hours and losing leads to competitors.
Solution: 24/7 AI voice agent handling inbound calls, qualifying leads and booking appointments directly into the team's calendar via n8n automation.
100% call coverage. 40% reduction in missed leads within the first month.
MT5 trade copier platform
Problem: A signal provider needed to copy trades in real time across 100+ client accounts on multiple brokers with per-account lot scaling.
Solution: Custom MT5 trade copier with web dashboard, broker-agnostic architecture, and configurable risk settings per account.
Sub-second execution across all accounts. Provider scaled from 40 to 120 subscribers within 90 days.
AI-powered Next.js SaaS dashboard
Problem: A fund manager was tracking performance across 12 accounts manually in spreadsheets — 8+ hours of work every week.
Solution: Next.js SaaS dashboard with live data feeds, AI-generated performance summaries, P&L tracking and automated drawdown alerts.
Reporting time reduced from 8 hours to under 20 minutes. Client renewed for ongoing development retainer.
Who we work with
Why clients choose us
Four pillars that keep clients coming back — hover to explore each one.
Deep domain expertise
We understand trading technology and financial markets at a technical level — not just how to write code, but how markets work, how brokers behave and where systems fail under live conditions.
Production-ready delivery
Everything we build is designed for live environments. No half-built prototypes, no handoffs that break on deployment. Source code, documentation and post-launch support included as standard.
Fast turnaround
Most projects start within 5 business days. We work in focused sprints with regular updates — so you always know where your project stands.
You own everything
Full source code ownership from day one. NDA available on request. No vendor lock-in, no licensing fees, no surprises.
Our tech stack
Specialized toolsets selected for speed, concurrency, and cold-run reliability.
Trading Systems
Expert Advisor & Strategy SuiteAI & Automation
Generative Agents & WorkflowsDevelopment Suite
Production Web & Mobile StackWhat clients say
Real feedback sourced directly from verified clients, Direct NDA projects, and enterprise client approvals.
"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 🙏"
How it works
A structured, milestones-driven engagement framework designed for speed and corporate trust.
Free consultation
Book a 30-minute call. Tell us what you need. We'll scope it, ask the right questions and give you an honest assessment — no obligation.
Proposal & timeline
You receive a fixed-price quote with a clear delivery timeline. NDA available. We don't start the clock until you're happy with the plan.
Build & iterate
Development begins within 5 business days. You get regular updates throughout. No black boxes, no surprises.
Delivery & support
Full source code, documentation and deployment. Post-launch support available. Most clients come back for their next project.
Ready to build something
that performs?
Whether you need a trading bot, an AI agent or a full SaaS platform — we'll scope it, price it and deliver it. Most projects start within 5 business days.