# Karthikeyan M - Senior Full-Stack Developer & Software Engineer

> Portfolio, engineering background, and verified technical knowledge base of Karthikeyan M, a Senior Full-Stack Developer with 4+ years of enterprise experience building scalable B2B SaaS platforms, multi-provider AI agents, e-commerce architectures, and high-performance web applications.

## Quick Summary

- **Full Name**: Karthikeyan M
- **Target Role**: Senior Full-Stack Developer / Senior Software Engineer
- **Experience**: 4+ Years of Full-Stack Web Development & System Design
- **Location**: Chennai, Tamil Nadu, India (Available for Remote and Hybrid/On-Site roles)
- **Availability**: Immediate (Actively Seeking Full-Time Roles)
- **Primary Tech Stack**: React 19, Next.js, Node.js, Express.js 5, TypeScript, PostgreSQL, Prisma ORM, Redis, Tailwind CSS v4, AI SDKs
- **Production URL**: https://mkkcreation.com
- **Contact Email**: mkarthi.dev@gmail.com
- **Phone**: +91 97919 34388
- **LinkedIn**: https://www.linkedin.com/in/mkk-karthi
- **GitHub**: https://github.com/mkk-karthi
- **Curriculum Vitae (Resume)**: https://mkkcreation.com/assets/Karthikeyan-M-Resume.pdf

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## Technical Expertise & Skills

### Frontend Engineering
- **Core**: React 19, Next.js (App Router, Turbopack, SSG/SSR), TypeScript, JavaScript (ES6+)
- **Styling & Design Systems**: Tailwind CSS v4, CSS3, Responsive Design, Dark Mode, Glassmorphism
- **State Management & Data Fetching**: Zustand, TanStack React Query v5, Context API
- **Real-Time Client Architecture**: Server-Sent Events (SSE) streaming, WebSockets, optimistic UI updates

### Backend & API Architecture
- **Runtimes & Frameworks**: Node.js, Express.js 5, Python (FastAPI), PHP (Laravel, Core PHP)
- **API Design**: RESTful APIs, SSE streaming endpoints, microservices, webhook pipelines
- **Databases & ORMs**: PostgreSQL, MySQL, Prisma ORM (modular schemas), Redis (caching & sessions)
- **Security & Auth**: JWT (HttpOnly cookies), bcrypt, AES-256 encryption, CORS, Rate Limiting, Helmet

### AI & Emerging Tech Integration
- **LLM Orchestration**: OpenAI SDK (GPT-4o, o-series), Google Gemini (Gemini 3.1 Flash to 3.8 Flash)
- **Agent Architecture**: Relational tree-structured message branching (parent-child message trees), sliding-window context pruning, tool execution loops
- **Grounding & Web Search Tools**: Autonomous search pipelines with Tavily, Jina AI, DuckDuckGo fallbacks
- **Observability**: Turn-by-turn token metering and cost accounting

### Integrations & Tooling
- **Payment Processing**: Stripe API (Subscriptions, Elements, Webhooks), Google Play Billing
- **Third-Party APIs**: Shopify Storefront & Admin APIs, OpenAI API, Tavily API
- **DevOps & Infrastructure**: Docker, Git/GitHub, Linux (Ubuntu/Debian), Vercel, npm CLI publishing

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## Featured Engineering Projects

### 1. MKK AI Agent – Multi-Provider Platform
- **URL**: https://mkkcreation.com/#projects
- **Category**: Full-Stack AI Platform
- **Tech Stack**: React 19, TypeScript, Express.js 5, PostgreSQL, Prisma 7, TanStack Query, Tailwind CSS v4, Zustand, SSE Stream
- **Overview**: Production-grade multi-provider AI agent web application featuring real-time SSE streaming, dynamic provider switching (Gemini and OpenAI), autonomous web search grounding, non-linear relational tree message branching, token metering, and AES-256 encrypted key isolation.

### 2. Nanban Crackers – Festive E-Commerce Platform
- **URL**: https://nanbancrackers.mkkcreation.com
- **Category**: Next.js E-Commerce
- **Tech Stack**: Next.js 16, React 19, Tailwind CSS, Zustand, jsPDF
- **Overview**: Factory-direct fireworks e-commerce store with 100+ wholesale products, gift box combos, persistent cart state, order validation, and client-side PDF invoice generation.

### 3. Photography & Custom Framing Studio
- **URL**: https://photography.mkkcreation.com
- **GitHub**: https://github.com/mkk-karthi/photography
- **Category**: Next.js Web Application
- **Tech Stack**: Next.js, TypeScript, Tailwind CSS
- **Overview**: Luxury studio showcase with interactive pricing calculator, dynamic framing packages, gallery showcases, and booking inquiry workflows.

### 4. React Games Platform
- **URL**: https://games.mkkcreation.com
- **GitHub**: https://github.com/mkk-karthi/react-games
- **Category**: Frontend Interactive Application
- **Tech Stack**: React.js, TypeScript, Tailwind CSS
- **Overview**: Interactive gaming platform featuring 10+ custom games demonstrating advanced React state management, custom hooks, and high-FPS rendering.

### 5. Create Express Project (npm CLI Package)
- **npm Registry**: https://www.npmjs.com/package/create-new-express-project
- **GitHub**: https://github.com/mkk-karthi/create-new-express-project
- **Category**: Developer Tooling & Backend
- **Tech Stack**: Node.js, Express.js, npm CLI
- **Overview**: Open-source CLI scaffolding package on npm for initializing structured Express.js MVC architectures with zero boilerplate.

### 6. Developer Portfolio
- **URL**: https://mkkcreation.com
- **GitHub**: https://github.com/mkk-karthi/portfolio-next-js
- **Category**: Next.js Application
- **Tech Stack**: Next.js 16, React 19, Tailwind CSS v4, TypeScript
- **Overview**: High-performance static web application featuring URL hash synchronization, rich Schema.org JSON-LD structured data, and responsive Swiper components.

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## Professional Career History

### Senior Full-Stack Engineer / Software Engineer (Aug 2022 – Oct 2024)
- Architected enterprise B2B e-commerce platforms, job portals, and AI-powered product content generation systems.
- Led a 3-engineer development pod: performed rigorous code reviews, guided architecture, and mentored junior engineers.
- Built e-KYC workflows, automated reward point systems, Google Ads tracking, and Shopify API integrations.
- Tech Stack: React.js, Next.js, Node.js, Express.js, Laravel, PostgreSQL, Redis.

### Junior Full-Stack Developer – Vaagai Tecknowledge (Jun 2021 – Jul 2022)
- Built members portal with RBAC, user profile management, and registration verification.
- Developed event management & ticketing systems integrated with online payment processing.
- Created stock management & invoice generation systems handling bulk merchant orders.
- Tech Stack: Laravel, React.js, Vue.js, MySQL, Bootstrap.

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## Education

- **B.Sc. Computer Science**: VHNSN College (2018 – 2021) — 72% Aggregate. Focus: Data Structures, Web Technology, Software Engineering, Database Systems.
- **Higher Secondary Certificate (HSC)**: KVS Higher Secondary School (2016 – 2018) — 70.25% Aggregate (Computer Science Stream).

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## Key Site Links & Navigation

- **Home**: https://mkkcreation.com
- **About Section**: https://mkkcreation.com/#about
- **Services Section**: https://mkkcreation.com/#services
- **Experience Section**: https://mkkcreation.com/#experience
- **Projects Section**: https://mkkcreation.com/#projects
- **Contact Section**: https://mkkcreation.com/#contact
- **Resume (CV)**: https://mkkcreation.com/assets/Karthikeyan-M-Resume.pdf
- **Sitemap**: https://mkkcreation.com/sitemap.xml
- **Robots.txt**: https://mkkcreation.com/robots.txt
- **LLM Context**: https://mkkcreation.com/llms.txt