Harish V

Full Stack Developer

0%

Hi, I'm

Harish V

Full Stack Developer|

Building high-performance trading platforms with 15+ microservices and 10,000+ concurrent WebSocket connections.

View GitHubContact Me

Tech I work with

Next.js
React
TypeScript
JavaScript
NestJS
Node.js
MongoDB
Redis
Socket.io
Docker
Tailwind CSS
Git
Linux

01. About

Who I Am

I'm a Full Stack Developer passionate about building scalable, real-time systems. I specialize in designing distributed microservice architectures for high-frequency trading platforms. My expertise includes handling order matching, real-time market data, wallet systems, and concurrent WebSocket connections at scale. I care deeply about clean architecture, performance optimization, and shipping reliable systems.

harish.config.ts

const developer = {

name: "Harish V",

role: "Full Stack Developer",

focus: "Crypto Exchange Platforms",

stack: ["NestJS", "Next.js", "MongoDB"],

passion: "Building systems at scale",

};

15+

Microservices

10K+

WebSocket Connections

13+

Technologies

100+

Trading Pairs

02. Projects

What I've Built

A production-grade crypto exchange platform — from order matching to real-time market data, wallet management to admin tools.

Crypto Exchange Platform

Full-featured cryptocurrency exchange supporting real-time spot & futures trading with order matching, liquidation engine, and portfolio management.

  • ▸Real-time order book with WebSocket streaming
  • ▸Futures trading with leverage up to 125x
  • ▸Automatic liquidation & margin management
  • ▸Multi-currency wallet with deposit/withdrawal
NestJSMongoDBRedisWebSocket

Microservices Architecture

Distributed system of 15+ independently deployable services communicating via TCP/Redis, handling high-throughput trading operations.

  • ▸Event-driven CQRS architecture
  • ▸Service discovery & load balancing
  • ▸PM2 cluster mode for zero-downtime deploys
  • ▸Centralized logging & monitoring
NestJSDockerRedisPM2

Real-Time Market Data

High-performance crypto price aggregation from multiple exchanges (MEXC, Binance) with protobuf-encoded WebSocket streaming.

  • ▸Protobuf binary encoding for low-latency feeds
  • ▸Multi-exchange price aggregation
  • ▸Candlestick generation (1m to 1M timeframes)
  • ▸10,000+ concurrent WebSocket connections
Node.jsProtobufWebSocketRedis

Trading Dashboard

Feature-rich Next.js trading interface with real-time charts, order management, portfolio tracking, and admin CRM tools.

  • ▸Live candlestick charts with TradingView
  • ▸One-click trading with instant execution
  • ▸Admin CRM for user & campaign management
  • ▸Responsive design with dark/light themes
Next.jsReactTailwindSocket.io

Wallet & Payment System

Secure multi-currency wallet supporting deposits, withdrawals, internal transfers, and FIFO-based P&L tracking for tax compliance.

  • ▸Multi-currency support with real-time balances
  • ▸FIFO cost-basis tracking for tax reporting
  • ▸Transaction history with export capabilities
  • ▸Secure withdrawal with 2FA verification
NestJSMongoDBNode.jsTypeScript

Notification & Bot System

Multi-channel notification pipeline with Slack alerts, email notifications, and automated trading bot gateway for algorithmic strategies.

  • ▸Real-time Slack & email alerts
  • ▸Bot gateway for algo trading strategies
  • ▸Campaign management for user engagement
  • ▸WebSocket-based event broadcasting
NestJSSlack APIWebSocketRedis

03. Experience

What I Do

The core engineering challenges I've tackled — from system design to production deployment.

architecture

Distributed Microservices

Designed & built 15+ NestJS microservices with TCP/Redis transport, CQRS event sourcing, and independent deployment pipelines.

feature

Real-Time WebSocket Systems

Engineered WebSocket infrastructure handling 10K+ concurrent connections with pub/sub broadcasting for live market data feeds.

feature

Futures Trading Engine

Built a complete futures trading system with leverage, margin calculation, automatic liquidation, and real-time P&L tracking.

infrastructure

Database Architecture

Designed MongoDB schemas with compound indexes, aggregation pipelines, and Redis caching for sub-millisecond read performance.

infrastructure

CI/CD & DevOps

Set up Jenkins pipelines, Docker containerization, PM2 cluster deployment, and centralized logging across all services.

architecture

Security & Auth

Implemented IAM gateway with JWT authentication, role-based access control, 2FA, and API rate limiting across all services.

Tech Proficiency

NestJS / Node.js95%
TypeScript92%
MongoDB90%
Next.js / React88%
Redis / Caching85%
WebSocket / Real-Time90%
Docker / DevOps80%
System Design88%

05.Resume

A quick overview of my professional experience and skills.

View Full ResumeDownload Resume

Summary

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.

Technical Skills

Languages—TypeScript, JavaScript (ES6+), HTML5, CSS3
Frontend—Next.js, React.js, Tailwind CSS, Redux, Framer Motion, i18n
Backend—NestJS, Node.js, Express.js, REST APIs, Microservices, TCP
Databases—MongoDB, Mongoose, Redis (Caching/Pub-Sub), InfluxDB
Real-Time—Socket.IO, WebSocket, Redis Adapter, BullMQ, Kafka
DevOps—Docker, PM2, Jenkins CI/CD, Git, Linux, Nginx
Architecture—Microservices, CQRS, Event-Driven, EventStoreDB, FIFO Engine
Security—PassportJS (JWT), bcrypt, RBAC, Rate Limiting, Helmet

Experience

Software Engineer

Nov 2023 – Present

PiBase Solutions Private Limited

Project: UNICOIN-DCX Cryptocurrency Exchange Platform

Trading Engine
  • Built futures trading module with limit, market, stop-limit, and stop-market orders across 50+ trading pairs
  • Implemented FIFO matching engine with BullMQ job processors for deterministic order execution
  • Developed liquidation engine with Binance-compatible formula for isolated and cross-margin modes
  • Built spot trading with bulk cancellation and presale ICO functionality
WebSocket & Real-Time
  • Designed 10 WebSocket gateways handling 10,000+ concurrent connections
  • Implemented Redis-backed Socket.IO adapter for horizontal scaling with 99.9% reliability
  • Built real-time order book, ticker streams, and trade execution broadcasts
Market Data
  • Integrated live feeds from 6+ exchanges (Binance, MEXC, Bybit, Kraken, KuCoin, OKX)
  • Implemented Protobuf binary parsing reducing payload by 60% vs JSON
  • Built OHLC candlestick pipeline with TradingView-compatible APIs
Infrastructure
  • Architected 19 NestJS microservices with TCP/Redis transport and 3 API gateways
  • Redis caching reducing DB load by 40%, parallel operations cutting latency 30-50%
  • Docker containerization, PM2 cluster mode, Jenkins CI/CD pipelines

For the complete resume with all details, click "View Full Resume" above.

04. Contact

Let's Work Together

I'm always open to discussing new projects, ideas, or opportunities to build something great.

Email

harish.venkatesan23@gmail.com

Drop me a message anytime

GitHub

Harish-venkat84

Check out my repositories

LinkedIn

harish-software-engineer

Let's connect professionally

Say Hello