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.
Three specialist practices. One team. All delivered to production standard.
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.
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.
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.
Real projects. Real outcomes. Scroll or sort to explore our work.
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.
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.
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.
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.
Four pillars that keep clients coming back — hover to explore each one.
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.
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.
Most projects start within 5 business days. We work in focused sprints with regular updates — so you always know where your project stands.
Full source code ownership from day one. NDA available on request. No vendor lock-in, no licensing fees, no surprises.
Specialized toolsets selected for speed, concurrency, and cold-run reliability.
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 🙏"
A structured, milestones-driven engagement framework designed for speed and corporate trust.
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.
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.
Development begins within 5 business days. You get regular updates throughout. No black boxes, no surprises.
Full source code, documentation and deployment. Post-launch support available. Most clients come back for their next project.
Production architectures, latency benchmarks, and step-by-step implementation blueprints from our developers.
Learn how to build an Expert Advisor that passes prop firm rules with proper drawdown, max loss and trailing equity stops implementation.
Step-by-step architecture for connecting LLM tool calling to multi-step enterprise workflows, webhooks, and live databases.
How to leverage Next.js Server Actions, optimistic UI updates, and WebSocket pipelines for high-concurrency SaaS apps.
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.