Karthick SG
Senior Full-Stack Developer | MERN Stack & AI Integration
karthisg.dev@gmail.com
+91 90951 69428 · India (Open to US Remote)
linkedin.com/in/karthisgdotsg
github.com/karthisgk

Senior Full-Stack Developer with 5+ years of experience building and maintaining high-availability MERN stack applications (MongoDB, Express.js, React, Node.js). Expertise in developing secure, scalable RESTful APIs, building reusable React components with consistent cross-browser UX, and modeling performance-optimized MongoDB databases. Proven experience integrating AI-driven enhancements (Claude, Ollama) while maintaining data privacy, troubleshooting production issues, writing clean/testable code, and automating CI/CD pipelines to cut release cycles by 83%. Strong collaborator aligned with QA, design, and product goals, committed to code reviews and clear documentation.

Core Skills
Languages: JavaScript, TypeScript
Frontend: React, Redux, Reusable UI Components
Backend: Node.js, Express.js, NestJS
Databases: MongoDB (Modeling & Query Tuning)
Security & Auth: JWT, Session Auth, OAuth2
DevOps & Git: Git-based Collaboration, CI/CD
AI Integration: Claude API, Ollama, Data Privacy
Architecture: RESTful APIs, Microservices
Messaging: Kafka, Event-Driven Systems
Cloud: Azure Cloud, AWS Cloud
Engineering Standards: Clean & Testable Code
Collaboration: Product, Design & QA Alignment
Professional Experience
Senior Software Engineer (MERN & AI)
2022 – Present
Techversant Infotech
  • Developed and maintained scalable MERN stack web applications; built reusable, responsive React UI components.
  • Designed secure, scalable Express/Node.js REST APIs and implemented JWT and session-based authentication patterns.
  • Modeled MongoDB schemas and optimized queries/indexes, substantially reducing database response latency.
  • Integrated AI APIs (Claude, Ollama) to deliver intelligent enhancements while upholding data privacy standards.
  • Wrote clean, testable code, led code reviews, and automated CI/CD pipelines to cut release times by 83%.
Software Engineer — Full Stack
2021 – 2022
AES Technologies
  • Built responsive, high-performance React frontends and published reusable UI components for team-wide use.
  • Engineered secure Node.js/Express REST APIs with JWT and OAuth 2.0, integrating Singapore's national Singpass API.
  • Maintained Git-based collaborative workflows, refined technical documentation, and troubleshot production bugs.
Software Developer — MERN Stack
2020 – 2021
DDL Tech Solutions
  • Developed full-stack web applications using MERN stack, owning the lifecycle from schema to production deployment.
  • Designed MongoDB database schemas and optimized NoSQL queries for intensive customer billing workloads.
Key Projects
Education

MCA – KLN College of Engineering

B.Sc IT – Sourashtra College