Full Stack

4+Years
Exp.

Hello, I'm

Karthikeyan M

Senior Software Engineer

Chennai, Tamil Nadu, India

Download CV Contact Me About Me

Years Exp.

10+

Projects Done

100%

Client Satisfaction

Open to Opportunities

Senior Full-Stack Developer·React • Node.js • PostgreSQL|Chennai-Based|Available: Immediate

Senior Full-Stack Developer · Chennai · Available Now

View Full Resume

Full Stack & Freelance Engineering

Why Work With Me?

Senior Full Stack Developer with 4+ years of experience building AI-Powered B2B SaaS, e-commerce, job portal, transport booking and online driving course application. Strong experience in React.js, Node.js, Express.js, PostgreSQL, MySQL and Redis. Experienced in integrating Stripe, Google Play Billing, Shopify API and OpenAI API. Hands-on experience developing scalable full-stack applications, REST APIs, payment workflows, AI-powered features and background processing in Agile/Scrum environments.

Contact Me

Years Exp.

10+

Projects Done

100%

Quality Rate

Technical Competencies

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

Core Expertise Areas

Employment Focus

Actively seeking Senior Full-Stack Developer or Software Engineer roles. I bring 4+ years of enterprise-grade experience building scalable SaaS platforms, integrating payment systems, and delivering features - ready to contribute from day one.

Core Strength

Full-Stack Web Application Architecture

End-to-end design and development of scalable web applications using Next.js, React, Node.js, and FastAPI. Delivered platforms serving 10K+ active users with high-availability APIs and optimized database design.

View Resume Contact

Revenue Impact

Payment Integration & SaaS Features

Built subscription billing systems (Stripe, Google Play Billing), abandoned cart recovery workflows, invoicing engines, and loyalty modules - directly contributing to measurable revenue outcomes.

View Resume Contact

AI & Automation

AI-Powered Feature Development

Integrated OpenAI and Claude APIs for intelligent LLM workflows, automated content generation, AI-driven SEO, and business logic pipelines - accelerating product capabilities at scale.

View Resume Contact

Engineering Excellence

Database Design & Performance Optimization

PostgreSQL schema design, Redis caching layers, query optimization, OWASP security hardening, and legacy refactoring into clean, maintainable architecture for long-term scalability.

View Resume Contact

For Hiring Managers

Looking for a Full-Stack Engineer?

I'm actively seeking full-time Senior Full-Stack Developer or Software Engineer roles. Available immediate · Chennai-based, open to remote.

Get In Touch Resume

Professional Journey

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

SEP 2025 - Present

GK Technologies, Chennai

React.jsFastAPIPythonStripeMySQLREST APIs

Senior Software Engineer

Leading full-stack features for a online driving course platform serving 10K+ active users.

Key Achievements & Impact:

Built full-stack features for online driving course platform with real-time progress tracking.

Implemented abandoned cart recovery system with coupon offers, converting previously lost orders back into completed purchases.

Integrated Stripe & Google Play Billing: Delivered secure payment processing with real-time webhook processing.

Feb 2025 - Jul 2025

Clarity TTS, Chennai

LaravelNode.jsExpress.jsPostgreSQLRedis

Full Stack Developer

Engineered core booking and invoice modules for a high-traffic B2B & B2C multi-provider transport platform handling thousands of daily transactions.

Key Achievements & Impact:

Developed features for B2B and B2C multi-provider transport booking platform (flights, hotels, transfers) handling thousands of bookings.

Worked on flight booking data processing and invoice generation workflows, reducing manual effort significantly.

Collaborated agile methodologies for timely project delivery and high quality.

Aug 2022 - Oct 2024

Constient Global Solutions, Chennai

React.jsNext.jsNode.jsLaravelPostgreSQLRedis

Software Engineer

Delivered enterprise B2B e-commerce platforms, job portals, and AI-powered content systems - including leading a 3-person team on Shopify integration.

Key Achievements & Impact:

Built scalable B2B e-commerce and job portal applications, integrated reward points system, Google Ads and AI-powered product content generation and SEO automation.

Built e-KYC verification, and complete job application management for a multi-module enterprise portal.

Led 3-engineer team: Code reviews, Shopify integration, mentored 2 junior developers.

Contributed to a social media platform built using Core PHP by fixing application issues and bugs.

Jun 2021 - Jul 2022

Vaagai Tecknowledge, Virudhunagar

LaravelReact.jsVue.jsMySQLBootstrap

Junior Developer

Shipped full-stack web portals with payment gateways, event management, and inventory systems - building the technical foundation for the career ahead.

Key Achievements & Impact:

Built full-stack members portal: User registration, profile management, role-based access.

Implemented event management & ticketing modules with integrated payment processing.

Created order management system: Bulk orders, stock tracking, invoice generation.

Showcase & Code Repositories

Featured Projects

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

Full-Stack AI Platform

MKK AI Agent - Multi-Provider Platform

Full-Stack AI Platform

MKK AI Agent - Multi-Provider Platform

Production-ready enterprise AI agent platform featuring real-time SSE streaming, dynamic multi-model orchestration (Gemini & OpenAI), autonomous web search grounding (Tavily/Jina/DuckDuckGo), relational tree-structured message branching, token metering, and AES-256 encrypted credential management.

React 19TypeScriptExpress.js 5PostgreSQLPrisma 7TanStack QueryTailwind CSS v4Zustand

Next.js E-Commerce

Nanban Crackers - Festive E-Commerce

Next.js E-Commerce

Nanban Crackers - Festive E-Commerce

Sivakasi direct factory fireworks e-commerce platform featuring 100+ wholesale products, curated gift box combos, Zustand persistent cart, minimum order validation, and client-side PDF invoice generation.

Next.js 16React 19Tailwind CSSZustandjsPDF

Next.js Web Application

Photography & Framing Studio

Next.js Web Application

Photography & Framing Studio

Luxury photography and custom photo framing studio website featuring interactive service packages, event galleries, dynamic pricing calculator, and booking inquiry workflows.

Next.jsTypeScriptTailwind CSSAntigravity

Actively Seeking Full-Time Roles

Open to Full-Time Opportunities

I'm actively seeking Senior Full-Stack Developer or Software Engineer roles where I can architect scalable products, build robust full-stack systems, and drive measurable business impact from day one.

Role Target

Senior Full-Stack Engineer

React + Node / MERN

Location

Chennai, India

Open to Remote

Availability

Immediate

Notice: Immediate

Employment Type

Full-Time (Primary)

Freelance during transition