Karthick SG — Senior Full Stack & AI Engineer

Senior Full Stack Engineer with 5+ years delivering production-grade, cloud-native applications across MERN, MEAN, and NestJS stacks — from FHIR-compliant healthcare platforms to Singapore government-grade Singpass authentication systems. Proven track record architecting Azure-native microservices, automating CI/CD pipelines that cut release cycles by ~83%. At the frontier of AI Engineering — shipped a production MCP server integrating Claude AI for real-time financial tooling, and built a privacy-first Telegram AI assistant using n8n workflow automation and a locally hosted Qwen2.5:3b (Ollama) connected to an MCP backend — zero cloud cost, fully agentic. Published 3 open-source npm packages with 1,000–5,000+ downloads. Seeking a Senior Full Stack Engineer (Node.js, React, AI-integrated systems) to drive technical architecture, team growth, and AI-augmented product delivery.

Core Skills & Technologies

Node.js · Express.js · NestJS

React · Angular · TypeScript

MongoDB · PostgreSQL · Cosmos DB

Azure (Functions, Logic Apps, IaC / Bicep)

AWS (S3, Lambda, CloudFormation)

GitHub Actions · CI/CD Pipelines · Docker

Microservices · Event-Driven Architecture · Kafka

REST APIs · JWT · OAuth 2.0 · Singpass

FHIR R4 · Aidbox · Healthcare Interoperability

MCP Protocol · Claude AI API (Production)

Infrastructure-as-Code · CloudFormation · Bicep

React Native · SwiftUI · Mobile Development

n8n · Workflow Automation · Agentic AI Pipelines

Ollama · Local LLM Deployment · Qwen2.5

Professional Experience

Senior Software Engineer — Full Stack & Cloud

Dec 2022 – Present · 2+ yrs

Techversant Infotech Pvt. Ltd.

MERN · MEAN · NestJS · Azure IaC · AWS · FHIR R4 · Kafka · GitHub Actions

Engineered CI/CD pipelines with GitHub Actions across 3–5 NestJS microservices deployed to Azure Function Apps — slashing release cycles from ~30 min → under 5 min (~83% faster), enabling 5–15 automated deployments/week with zero manual intervention.
Architected and led a multi-tenant, FHIR R4–compliant healthcare platform serving 3–5 hospital tenants with NestJS modular microservices, Aidbox EHR integration, and Kafka-driven event pipelines — directly reducing clinical data exchange latency.
Automated Azure infrastructure provisioning end-to-end via IaC (Bicep), deploying Function Apps, Logic Apps, Event Grid, and Event Hub — eliminating ~4 hrs of manual setup per environment across 2 cloud environments.
Delivered telemedicine feature using Azure Communication Services — video room generation, webhook-driven patient notifications, supporting 20–100 concurrent users at initial rollout.
Built automated PDF reporting pipeline: cron-scheduled daily hospital summaries uploaded to S3 with pre-signed URLs and distributed via Kafka to downstream notification services.
Deployed AWS infrastructure via CloudFormation IaC; managed HIPAA-sensitive EHR document storage in S3 with fine-grained role-based access policies.

Software Engineer — Full Stack

Aug 2021 – Nov 2022 · 1 yr 4 mo

AES Technologies India Pvt. Ltd.

React · Angular · Node.js · OAuth 2.0 · Singpass API · React Native · JWT

Spearheaded R&D and production integration of Singapore's national Singpass API — delivering government-grade digital identity authentication across 1–2 production applications, meeting stringent security and compliance requirements.
Engineered scalable REST APIs (Node.js / Express) with JWT and OAuth 2.0 — built for high-availability with Singapore government security standards as the compliance baseline.
Delivered high-performance React and Angular UIs (Hooks, Redux, RxJS) across multiple production applications — optimised rendering, mobile-responsive, and cross-browser compatible.
Published 3 internal npm packages as shared organisation libraries, standardising component usage across teams and eliminating redundant development effort on repeated UI patterns.
Resolved critical React Native bugs affecting mobile app stability, shipping fixes across 2 product releases in close coordination with QA and business stakeholders.

Software Developer — Full Stack

Jun 2020 – Jul 2021 · 1 yr 2 mo

DDL Tech Solutions Pvt. Ltd. (Startup)

MERN · MEAN · SwiftUI · JWT · MongoDB · REST APIs

Built end-to-end enterprise web applications using MERN and MEAN stacks for multiple SME clients across accounting and operations domains, owning the full stack from schema to deployment.
Designed performant MongoDB schemas and optimised NoSQL queries for high-frequency billing workloads — improving data retrieval speed for invoice-heavy operations.
Engineered a reusable billing and invoice engine with role-based access control — adopted across multiple client platforms as a core accounting module.

Notable Projects

MCP Expense Tracker (AI-Powered)

TypeScript · MCP SDK · Claude AI API · Node.js · SSE

Designed and shipped a production MCP server integrating Claude AI as a natural-language interface for personal finance tracking. Defined custom tool schemas (add_transaction, read_transactions), deployed with SSE transport via supergateway + ngrok. Published as open-source on GitHub.

Open-Source npm Packages (3 Published)

React · Angular · TypeScript · JavaScript · npm

Authored and published 3 production npm packages: satti-table (Angular data table), react-satti-chart (React bar chart), react-pendulum-loader (CSS animation loader). Collectively 1,000–5,000+ downloads across the developer community.

Telegram AI Assistant — Local LLM + n8n

n8n · Ollama · Qwen2.5:3b · Telegram Bot API · MCP

Engineered a private, zero-cloud-cost AI chatbot on Telegram using n8n workflow automation and a locally hosted Qwen2.5:3b model via Ollama. Wired the bot directly to the Balance Calc MCP server — enabling natural-language financial queries (add transactions, fetch reports) entirely on-device. Demonstrates local LLM orchestration, agentic tool-calling, and privacy-first AI system design.

Multi-Tenant Healthcare Platform

NestJS · FHIR R4 · Azure · AWS S3 · Kafka · Aidbox

Led backend architecture for a FHIR R4–compliant multi-tenant EHR platform serving 3–5 hospital tenants — with video consultation, Kafka-driven event pipelines, automated PDF reporting, and Aidbox-based clinical data exchange.

Education & Certifications

Master of Computer Applications (MCA)

KLN College of Engineering, Madurai · 2018–2020

B.Sc. Information Technology

Sourashtra College of Arts & Science, Madurai · 2014–2017

AI Engineering — MCP, RAG, Multi-Agent Orchestration (Self-directed, 2025–26)

Open-source contributor — 3 published npm packages · 1,000–5,000+ downloads