DOJi is the development studio behind MarketCanvas, ClipExchange, a fully automated trading system, and Meridian, a tax-aware rebalancing engine for wealth management. We take products from architecture to launch and beyond: frontend, backend, payments, security, and operations.
Products we designed, built, and operate ourselves. Every system below runs in production.
A platform where traders draw, share, and sell candlestick chart patterns. Built on a custom HTML5 Canvas engine with real-time multi-user collaboration, a two-sided marketplace with creator payouts through Stripe Connect, and a course platform with interactive video assessments students answer by drawing.
A marketplace connecting brands with verified social media creators. Escrow-style payments with Stripe manual capture protect buyers until creators deliver, Instagram and TikTok accounts are verified through an automated bio-challenge flow, and orders, messaging, and payouts run through a hardened PostgreSQL backend.
A fully automated long/short trading system built on statistical edge from 3 years of classified market data. Fifteen serverless functions orchestrate data ingestion, signal detection, and execution across two broker APIs, with position sizing validated through 10,000-iteration Monte Carlo simulation. It trades autonomously from pre-market to close.
An engine that keeps a client's portfolio on target without creating tax bills it did not need to. It chooses which tax lots to sell, screens every sale against the IRS wash-sale rule across the whole household, harvests losses when they are worth taking, runs the result through the client's investment policy, and records every decision in a hash-chained audit log. Exact decimal arithmetic end to end, 400 property-based tests, and a two-year synthetic history the engine ran itself.
The same systems we build for ourselves, built for you.
From idea to production: system architecture, frontend, backend, deployment, and post-launch operations. One team owns the whole build.
Two-sided platforms with Stripe Checkout, Billing, and Connect: seller onboarding, escrow-style flows, payouts, subscriptions, and webhook infrastructure.
Live collaboration, messaging, notifications, and analytics on PostgreSQL, Firebase, and Supabase backends with security rules written for production.
Data pipelines, scheduled jobs, broker and market-data API integrations, execution systems that run unattended on real money, and tax-aware portfolio engines built to the regulations.
DOJi LLC is a Virginia-based development studio founded and led by Pedro Petcov (B.S. Computer Science, NYU Shanghai). Every engagement gets founder-level ownership: the person who designs your architecture also writes the code, wires the payments, hardens the security, and stays for operations after launch.
The studio has shipped four production systems, run a 3-person engineering internship program with structured code review, and builds with AI-accelerated development workflows to deliver at a pace small teams normally can't.
Tell us what you're building. We'll reply with an honest read on scope, timeline, and whether we're the right fit.
Best suited for: marketplaces, SaaS products, payment integrations, real-time platforms, and data or trading infrastructure.
