Available for freelance projects
Karthik
Sundararajan
Senior Full-Stack, Mobile & Cloud Engineer
15+ years of shipping products that scale — from early-stage MVPs to enterprise-grade platforms. React, Next.js, Node.js, React Native & AWS.
15+
Years Experience
50+
Projects Delivered
3
Core Domains
About Me
Engineering that actually ships.
I'm Karthik Sundararajan, a senior software engineer with over 15 years of hands-on experience building full-stack web applications, mobile apps, and cloud infrastructure for businesses across industries.
I've worked with startups, mid-size companies, enterprises, and agencies — adapting to each team's pace and standards while bringing senior-level ownership to every project I take on.
What sets me apart isn't just technical depth — it's that I understand the product side too. I build systems that are maintainable, scalable, and aligned with business goals, not just code that works today.
Karthik Sundararajan
Senior Software Engineer
● Available for projects
What I Do
Services
From initial architecture to production deployment — I cover the full spectrum of modern software engineering.
Full-Stack Web Development
End-to-end web application development using React.js, Next.js, Node.js, and Express. From architecture to deployment — clean, maintainable code built to scale.
Mobile App Development
Cross-platform mobile apps using React Native that deliver native-like performance on both iOS and Android. Fast builds, great UX, single codebase.
Cloud & DevOps
AWS infrastructure setup, CI/CD pipelines, containerization, and deployment automation. Reliable, secure, and cost-optimised cloud environments.
Database Design & Optimisation
Schema design, query optimisation, and data modelling across relational and non-relational databases. Built for performance at any scale.
API Development & Integration
RESTful and GraphQL API design, third-party integrations, authentication systems, and microservices architecture that teams love to work with.
Technical Consulting
Architecture reviews, tech stack decisions, code audits, and engineering mentorship. Bring senior perspective to your team without the overhead.
Tools of the Trade
Tech Stack
A curated set of technologies I've used deeply over 15+ years — not a buzzword list.
Frontend
Backend
Mobile
Databases
Cloud & DevOps
Tools
Selected Work
Projects
A snapshot of complex, real-world products I've architected and shipped end-to-end.
Fixcent ERP
Enterprise Resource PlanningA comprehensive ERP system built for business operations management — covering inventory, finance, HR workflows, and real-time reporting dashboards. Designed for scale and reliability in enterprise environments.
Splendx E-Commerce
E-Commerce PlatformA full-featured e-commerce platform with product catalogue management, dynamic pricing, payment gateway integrations, order tracking, and a mobile-responsive storefront built for conversion.
Logistics Platform
Logistics & Supply ChainAn end-to-end logistics management platform for tracking shipments, managing fleets, assigning delivery agents, and providing live route updates — built for high throughput and real-time data accuracy.
More projects available on request — let's talk
Get In Touch
Let's build something great together.
Whether you have a project ready to kick off, need a senior engineer on your team, or just want to explore possibilities — I'd love to hear from you.
Location
Bengaluru, India (Remote Worldwide)