HARISH V

Full Stack Developer with 2+ years of hands-on experience building a production-grade cryptocurrency exchange platform. Architected 19 NestJS microservices processing real-time trading data across spot and futures markets. Designed and delivered FIFO matching engines, liquidation systems, and 10 WebSocket gateways handling 10,000+ concurrent connections. Built 3 Next.js frontend applications and integrated live market data from 6+ crypto exchanges using Protobuf-encoded feeds. Core expertise in TypeScript, NestJS, Next.js, MongoDB, Redis, and distributed systems architecture.

• Built the complete futures trading module with limit, market, stop-limit, and stop-market order types across 50+ trading pairs with sub-second execution latency
• Implemented FIFO matching engine for deterministic order execution using dedicated BullMQ job processors for matching and settlement workflows
• Developed liquidation engine with Binance-compatible liquidation price formula supporting both isolated and cross-margin modes with real-time margin monitoring
• Built TP/SL automation, funding fee calculations, and position management with real-time PnL tracking and leverage up to 125x
• Developed spot trading system with limit, market, and maker-market orders, bulk cancellation, and presale ICO functionality

• Designed 10 WebSocket gateways (spot public/private, futures public/private, forex, feeder, presence, support chat, live agent, bot gateway) handling 10,000+ concurrent connections
• Implemented Redis-backed Socket.IO adapter for horizontal scaling with 99.9% message delivery reliability across server instances
• Built real-time order book updates, ticker streams, candlestick feeds, and trade execution broadcasts for spot and futures markets

• Integrated live price feeds from 6+ exchanges (Binance, MEXC, Bybit, Kraken, KuCoin, OKX) for spot and futures data aggregation
• Implemented Protobuf binary message parsing for MEXC WebSocket feeds, reducing payload size by 60% compared to JSON
• Built OHLC candlestick pipeline with TradingView-compatible charting APIs across configurable timeframes (1m to 1M)
• Integrated Pyth Network oracle for decentralized crypto price feeds and forex integration for fiat currency pricing

• Built Admin Dashboard for exchange configuration, symbol management, KYC verification workflows, and real-time platform monitoring
• Developed CRM Application with live agent chat via WebSocket, dispute resolution, campaign management, and support ticket workflows
• Contributed to Trader Application with live order book, trade execution panels, portfolio management, and responsive trading layouts

• Architected 19 NestJS microservices with TCP transport and Redis pub/sub, plus 3 API gateways with JWT authentication, rate limiting, and structured logging (Pino)
• Built CQRS and event-driven patterns using EventStoreDB, BullMQ job queues, and NestJS event emitters for order processing and settlement
• Developed shared libraries (@pix/common-nest-js, @pix/common-next) for code reuse across backend services and frontend apps
• Implemented Redis caching reducing database query load by 40% and parallel database operations cutting latency by 30-50%
• Designed multi-channel notification system (email via Nodemailer, SMS via Twilio, push via Firebase) with Handlebars templates and BullMQ async processing
• Built mobile alert app (Expo React Native) with real-time WebSocket dashboard, push notifications, and Telegram bot integration for system monitoring
• Configured Docker containerization, PM2 cluster mode for zero-downtime deploys, and Jenkins CI/CD pipelines

• Full cryptocurrency exchange supporting spot and futures trading with leverage up to 125x
• 19 independently deployable microservices communicating via HTTP and Redis pub/sub
• 3 frontend applications: Trader (trading UI), Admin (configuration & monitoring), CRM (back office & support)
• 3 API gateways with JWT auth, role-based access control, request throttling, and structured logging
• Live market data aggregation from 6+ crypto exchanges with Protobuf binary encoding
• Secure wallet system with FIFO cost-basis tracking and multi-currency support
• Multi-channel notification pipeline (email, SMS, push) with async BullMQ processing
• Mobile alert app (Expo React Native) with WebSocket dashboard and Telegram bot for system alerts

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