OsEngine is a comprehensive, multi-exchange algorithmic trading platform for desktop (WPF/WinForms hybrid). It provides data downloading (OsData), backtesting (OsTester), walk-forward optimization (OsOptimizer), and live trading (OsTrader) with support for 30+ exchange connectors (MOEX, Binance, Bybit, OKX, Interactive Brokers, etc.). The platform includes a built-in technical indicator library (100+ indicators), a trading robot framework with attribute-based registration, and an MCP (Model Context Protocol) API for external AI/automation control. The architecture is modular: separate executables for different modes, a common server abstraction layer, and a consistent parameter system for bots and indicators. While the codebase is large and well-organized, it suffers from significant duplication across exchange connector entity classes and some copy-paste logic in trading robots. The UI mixes WPF and Windows Forms, and some patterns are legacy. Overall, it is a production-grade algorithmic trading platform with strong engineering practices and a rich feature set.