Available for work

Kishore Kumar
Sivakumar

Full-Stack Software Engineer

Building AI-powered RAG systems, real-time video streaming, and enterprise security platforms with React, Node.js, Flutter, WebRTC, and LangGraph.

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About

A bit about me.

I'm a Full-Stack Software Engineer with 2+ years building production systems that scale.

I specialize in AI-powered RAG systems, real-time video streaming, and enterprise security platforms — building applications with React, Node.js, Flutter, WebRTC, and LangGraph that serve enterprise surveillance and customer engagement workflows.

My expertise spans the entire stack — from crafting pixel-perfect React interfaces to architecting robust Node.js backends and deploying cross-platform Flutter apps. I build real-time systems with WebRTC and WebSockets, delivering sub-second latency for mission-critical applications.

Clean Code
Performance
Scalable
Open Source

Skills

Tools of the trade.

Technologies I use to bring ideas to life.

Languages

01
JavaScriptTypeScriptDartPythonSQLHTML5CSS3

Frontend

02
React.jsNext.jsRedux ToolkitTailwind CSSshadcn/ui

Backend

03
Node.jsExpress.jsREST APIsJWTOAuthRBAC

AI / LLM

04
LangChainLangGraphLangSmithLanceDBRAGEmbeddingsVector SearchSemantic SearchOllama

Real-Time & Streaming

05
WebRTCWebSocketsServer-Sent Events (SSE)

Mobile

06
FlutterFirebaseCloud MessagingCrashlyticsGoogle Play Deployment

Database

07
MySQL

Tools

08
GitGitHubPostmanDockernpmpnpm

AI Developer Tools

09
Claude CodeOpenAI Codex

Experience

Where I've worked.

Rurutek Private Limited

Software Engineer

Current

Rurutek Private Limited

Aug 2023 – May 2026
Chengalpattu, Tamil Nadu
  • Designed and developed web, mobile, AI-powered, and real-time applications using React.js, Node.js, Flutter, MySQL, and modern JavaScript/TypeScript ecosystems, delivering scalable solutions across multiple business domains
  • Architected backend services, REST APIs, authentication systems, and role-based access controls (RBAC), integrating WebRTC, WebSockets, ONVIF, JWT, and OAuth for secure, low-latency applications
  • Built real-time surveillance streaming with WebRTC, cutting end-to-end video latency from 5–10 seconds to under 1 second
  • Developed 100% code-reuse Flutter modules across Android and iOS platforms
  • Performed debugging and root-cause analysis, using Docker, Git, and Postman to streamline development

Work

Things I've shipped.

Production systems I've architected and shipped.

PROJECT / 01

Enterprise RAG Chatbot

Enterprise RAG chatbot grounding responses in company knowledge bases, with real-time token streaming and an on-prem LLM for full data privacy.

LangChainLangGraphLangSmithLanceDBNode.jsOllamaSSE
  • OCR ingestion pipeline, semantic chunking, and vector search for grounded answers
  • Real-time token streaming (SSE) with on-prem Gemma via Ollama — sub-second delivery
  • Lead-qualification workflow with conversation memory, lead scoring, and CRM/email automation
PROJECT / 02

IP Camera Management & Real-Time Surveillance

Real-time IP camera platform with ONVIF device discovery, PTZ control, playback, and multi-camera monitoring across web and mobile.

ReactNode.jsExpress.jsMySQLWebRTCWebSocketsONVIF
  • RTSP-to-WebRTC pipeline reducing video latency from 5–10s to under 1s
  • ONVIF SOAP/XML-to-JSON gateway standardizing device management APIs
  • JWT-based access control and RBAC across streaming, config, and events
PROJECT / 03

Employee & Visitor Access Management

Enterprise access management platform with visitor registration, attendance tracking, and door access control across multi-site operations.

ReactRedux ToolkitNode.jsExpress.jsMySQLTailwind CSSshadcn/ui
  • Visitor registration and attendance tracking with door access integration
  • Comprehensive audit logging for security reviews and compliance
  • Role-based access control (RBAC) implementation
PROJECT / 04

SRC PPL Billing App

Production billing app on the Google Play Store with invoice generation, real-time sync, push notifications, and crash monitoring.

FlutterFirebaseFCMCrashlyticsRBAC
  • Invoice generation with role-based access control
  • Real-time synchronization and push notifications via Firebase Cloud Messaging
  • Deployed to the Google Play Store with crash monitoring
View on Play Store

Open Source

Giving back.

Contributing to the community that shaped me.

lucide-animated

Lucide-Animated

OSS / 01

Contributed 30+ reusable animated React/Next.js icons to a 7.7k-star open-source library, improving developer adoption and UI animation capabilities.

7.7k+GitHub Stars
30+Animated Icons
  • Contributed 30+ reusable animated React/Next.js icons (PRs #149–#161)
  • Improved developer adoption and UI animation capabilities
View on GitHub →
LocalSend

LocalSend

OSS / 02

Cross-platform file sharing app with 60k+ GitHub stars. Open-source alternative to AirDrop, used across desktop and mobile ecosystems.

60k+GitHub Stars
TamilLocalization
  • Delivered production features including Select Multiple APK at once (#1875)
  • Added Tamil localization support (#2129)
View on GitHub →
KISHORE-KUMAR-S's GitHub Contribution Graph

@KISHORE-KUMAR-S — GitHub Contribution Activity

Education

Where I studied.

Bachelor of Engineering

Computer Science and Engineering

K. S. Rangasamy College of Technology

CGPA: 8.71 / 10

2019 – 2023
Tiruchengode, Tamil Nadu, India

Contact

Let's build something.

Open for collaborations and full-time opportunities.

Get in touch