Karthick SG
Senior Software Engineer II | JS, React, Node.JS, GraphQL
karthisg.dev@gmail.com
+91 90951 69428 · India (Open to Remote / Hybrid)
linkedin.com/in/karthisgdotsg
github.com/karthisgk

Senior Software Engineer II with 8 years of web development experience (5+ in lead roles) specializing in JavaScript, React, Redux, Node.js, and GraphQL APIs. Proven expertise leading agile cross-functional teams, optimizing web performance (Web Vitals) and accessibility (WCAG), driving deployment confidence via automated testing (Jest, Cypress), and partnering with SRE teams to resolve production issues. Active technical mentor and open-source author (3 npm packages).

Core Skills
Languages: JavaScript (ES6+), TypeScript
Frontend: React.js, Redux Toolkit, Context API
Backend: Node.js, Express.js, NestJS
APIs & Data: GraphQL, REST APIs, Apollo, MongoDB
Testing & QA: Jest, React Testing Library, Cypress
Quality & SRE: Web Vitals, WCAG Accessibility, SRE
DevOps & Cloud: CI/CD, GitHub Actions, Docker, Azure
Architecture: Microservices, Event-Driven, Caching
Security: OAuth 2.0, JWT, Singpass, RBAC
Leadership: Tech Mentorship, Code Reviews, Agile
Open Source: 3 Published npm packages (1k–5k+)
AI Tech: Claude API, MCP, LLM Tooling
Professional Experience
Senior Software Engineer — Technical Lead
2022 – Present
Techversant Infotech
  • Led end-to-end web app development on multi-functional team using React, Node.js, and GraphQL APIs
  • Mentored engineers through code reviews, pair programming, and engineering workflow refinements
  • Optimized frontend performance (<1.8s LCP) and accessibility compliance (WCAG 2.1 AA)
  • Slashing release cycles by 83% (30 min → <5 min) with automated CI/CD & Jest/RTL testing
  • Investigated and resolved critical production issues in close coordination with SRE team
Software Engineer
2021 – 2022
AES Technologies
  • Developed responsive React/Redux user interfaces and high-concurrency Node.js Express REST & GraphQL APIs
  • Integrated Singpass national digital identity verification adhering to strict OAuth 2.0 security standards
  • Authored 3 internal npm libraries standardizing component design tokens and UI building blocks
Software Developer
2020 – 2021
DDL Tech Solutions
  • Built full-stack JavaScript/MERN enterprise applications; optimized MongoDB queries for high-volume transactions
  • Translated product business requirements into scalable, role-secured backend services
Key Projects
Education

MCA – KLN College of Engineering  ·  B.Sc IT – Sourashtra College