Full Stack

4+Years
Exp.

Hello, I'm

Karthikeyan M

Senior Full Stack Engineer

Chennai, Tamil Nadu, India

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Years Exp.

10+

Projects Done

100%

Client Satisfaction

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Full Stack & Freelance Engineering

Why Work With Me?

Senior Full Stack Engineer with 4+ years of experience architecting high-performance web applications, enterprise microservices, and AI-driven automation systems. Specialized in React.js, Next.js, Node.js, Python (FastAPI), and Laravel. Known for accelerating product velocity using AI workflow tools (Claude Code, Antigravity), optimizing backend performance by up to 25%, and delivering turn-key client solutions.

Years Exp.

Projects Done

100%

Quality Rate

Technical Competencies

React.jsNext.jsTypeScriptJavaScript (ES6+)Tailwind CSSVue.jsHTML5/CSS3

Freelance & Enterprise Offerings

Services I Deliver

Looking to launch a high-converting web app, scale an existing platform, or integrate AI/payment APIs? I bring enterprise engineering standards with agile freelance execution speed.

Full-Stack Web App & MVP Development

End-to-end development of modern web applications built with Next.js, React, Node.js, and FastAPI. Delivering high-performance APIs, database architecture, and SEO optimized scalable MVPs.

Revenue Focused

E-Commerce & Subscription Systems

Building conversion-focused platforms with automated subscription billing (Stripe/Google Play Billing), automated abandoned cart recovery, user loyalty modules, invoicing systems, and real-time dashboards to maximize revenue.

AI Powered

API & AI System Integration

Empowering web apps with intelligent LLM workflows (OpenAI, Claude), custom REST/gRPC API architectures, automated business logic pipelines, and third-party integrations for scalable growth.

Enterprise Quality

Performance & Code Refactoring

Elevating web platforms by optimizing database queries, implementing Redis caching layers, resolving OWASP security vulnerabilities, and refactoring legacy code into clean architecture.

Have a custom requirement?

Whether you need a dedicated Senior Full-Stack Engineer or a custom solution built from scratch, let's connect today.

Professional Journey

Proven track record delivering full-stack enterprise solutions and scalable web infrastructure.

AUG 2025 - Present

GK Technologies, Chennai

React.jsFastAPIPythonStripeMySQLREST APIs

Senior Software Engineer

Built full-stack features for a B2C subscription-based driving course platform serving 10K+ active users.

Key Achievements & Impact:

Engineered abandoned cart recovery funnel with custom promotional triggers, recovering 15% of lost orders.

Integrated Stripe and Google Play Billing for cross-platform web and mobile subscriptions.

Leveraged AI coding assistants (Claude Code, Antigravity) to double deployment velocity.

Feb 2025 - Jul 2025

Clarity TTS, Chennai

LaravelNode.jsExpress.jsPostgreSQLRedis

Full Stack Developer

Engineered core modules for a high-traffic B2B and B2C transport booking platform handling thousands of daily bookings.

Key Achievements & Impact:

Optimized order management & invoice generation pipelines, improving operational efficiency by 25%.

Integrated multi-provider travel APIs (flights, hotels, transfers) with robust error handling.

Collaborated in Agile/Scrum sprints for rapid feature iterations.

Aug 2022 - Oct 2024

Constient Global Solutions, Chennai

React.jsNext.jsNode.jsLaravelPostgreSQLRedis

Software Engineer

Developed enterprise B2B e-commerce platforms, member portals, and AI content creation systems.

Key Achievements & Impact:

Built AI product content generator & automated SEO metadata engine, cutting manual efforts by 70%.

Implemented member loyalty systems, automated KYC workflows, and full job recruitment engine.

Mentored junior engineers on Laravel design patterns and code quality standards.

Jun 2021 - Jul 2022

Vaagai Tecknowledge, Virudhunagar

LaravelReact.jsVue.jsMySQLBootstrap

Junior Developer

Built full-stack web portals using Laravel, Vue.js, and React.js with integrated payment gateways.

Key Achievements & Impact:

Developed event management and ticketing platform with automated email notifications.

Created dynamic user portal with responsive layout and security controls.

Showcase & Code Repositories

Featured Projects

Explore interactive web applications, npm packages, and developer tools built with React, Next.js, and Node.js.

Frontend Application

React Games Platform

Frontend Application

React Games Platform

Interactive gaming portal featuring 10+ custom web games. Demonstrates complex React state management, custom hooks, and high-FPS UI rendering.

React.jsTypeScriptTailwind CSS

Next.js Application

Enterprise & Freelance Portfolio

Next.js Application

Enterprise & Freelance Portfolio

High-performance developer portfolio with dark/light blue slate theme, glassmorphism, SEO optimizations, and Vercel analytics.

Next.jsTypeScriptTailwind CSSAOS

Developer Tools & Backend

Create Express Project (npm Package)

Developer Tools & Backend

Create Express Project (npm Package)

Production-ready CLI scaffolding package on npm for initializing structured Express.js MVC backends with zero manual configuration.

Node.jsnpm CLIExpress.jsJavaScript ES6

Let's Work Together

Let's Connect & Build

Seeking Senior Full-Stack Engineering roles and Freelance Web Projects. Reach out via any platform below!

mkarthi.dev@gmail.com

+91 97919 34388

linkedin.com/in/mkk-karthi

github.com/mkk-karthi