Karthick SG
Senior Full-Stack & GenAI Engineer — Model APIs, Tool Scaffolding & Cloud
karthisg.dev@gmail.com
+91 90951 69428  ·  Madurai, TN (Open to Remote)
linkedin.com/in/karthisgdotsg
github.com/karthisgk  ·  karthisgk.github.io

Senior Full-Stack Engineer with 5+ years of dedicated experience building production software and integrating frontier AI model APIs — from surrounding tool scaffolding, evaluation harnesses, and telemetry to high-availability microservices. Production proficiency across Python, TypeScript, Node.js, and Java ecosystems. Proven track record architecting cloud-native platforms on Azure and AWS, automating CI/CD pipelines that reduced release cycles by ~83%. At the core of GenAI development: shipped a production MCP server integrating Claude AI API for real-time tool calling, built a privacy-first Telegram AI assistant with Ollama (Qwen2.5:3b) and n8n workflows, and published 3 open-source npm packages (1,000–5,000+ downloads). Adept at rapid onboarding onto complex codebases, fast prototyping with shifting specs, and writing clear technical feedback for AI research teams.

Core Skills & Technologies
Python · TypeScript · Node.js · Java
React · Angular · Modern Frontend
Frontier Model API Integration · Tool Scaffolding
Evaluation Harnesses · Telemetry & Logging
PostgreSQL · MongoDB · Database Tuning
Azure (Function Apps, Bicep) · AWS (S3, Lambda)
Docker · GitHub Actions · CI/CD Pipelines
Microservices · REST APIs · OAuth 2.0 · JWT
MCP Protocol · Claude AI API · Local LLMs (Ollama)
Failure Mode Diagnosis & Technical Documentation
Fast Prototyping · Rapid Codebase Onboarding
FHIR R4 · Aidbox · Healthcare Interoperability
Kafka · Event-Driven Architecture · Webhooks
Open-Source Packages · C++ / C# Working Knowledge
Professional Experience
Senior Software Engineer — Full Stack & Cloud
Dec 2022 – Present · 3+ yrs
Techversant Infotech Pvt. Ltd.
Python · TypeScript · NestJS · Azure IaC · AWS · Model APIs · Kafka · GitHub Actions
  • Engineered CI/CD pipelines with GitHub Actions across 3–5 NestJS microservices and Python utility modules deployed to Azure Function Apps — slashing release cycles from ~30 min → under 5 min (~83% faster) with zero manual intervention.
  • Built and stress-tested full-stack services and internal tools integrated with model APIs, establishing telemetry logging and evaluation harnesses to diagnose API latency and failure modes under peak load.
  • Architected and led a multi-tenant FHIR R4-compliant healthcare platform with NestJS microservices, Aidbox EHR integration, and Kafka event pipelines — rapidly onboarding onto legacy EHR codebases to ship within tight timelines.
  • Automated Azure infrastructure provisioning end-to-end via IaC (Bicep), deploying Function Apps, Logic Apps, Event Grid, and telemetry monitoring — eliminating ~4 hrs of manual setup per environment.
  • Delivered real-time communication tools using Azure Communication Services — video room generation and webhook-driven patient notifications for 20–100 concurrent users.
  • Built automated reporting and telemetry pipelines: cron-scheduled daily data summaries with fine-grained access policies, uploading EHR telemetry to S3 with pre-signed URLs.
Software Engineer — Full Stack
Aug 2021 – Nov 2022 · 1 yr 4 mo
AES Technologies India Pvt. Ltd.
React · TypeScript · Node.js · OAuth 2.0 · Singpass API · React Native · REST APIs
  • Spearheaded R&D and production integration of Singapore's national Singpass API — delivering government-grade digital identity authentication with clear technical documentation and security compliance.
  • Engineered high-performance REST APIs (Node.js / Express) with JWT and OAuth 2.0 authentication, conducting rigorous load tests and failure mode analysis for mission-critical client services.
  • Delivered responsive React and Angular UIs across multiple production web applications, optimizing component rendering, state management, and cross-browser responsiveness.
  • Published 3 internal npm packages as shared organizational libraries, standardizing component design patterns across teams and eliminating redundant UI engineering.
  • Onboarded rapidly onto unfamiliar mobile codebases to resolve critical React Native bugs, shipping stable fixes across 2 product releases in close collaboration with product and QA leads.
Software Developer — Full Stack
Jun 2020 – Jul 2021 · 1 yr 2 mo
DDL Tech Solutions Pvt. Ltd. (Startup)
Python · MERN · MEAN · MongoDB · PostgreSQL · REST APIs
  • Built and shipped end-to-end enterprise web applications and internal operational tools using Python and JavaScript full-stack frameworks, delivering working increments with limited up-front specs.
  • Designed performant NoSQL and relational schemas (MongoDB, PostgreSQL), optimizing database queries for high-frequency operations and data retrieval.
  • Engineered reusable core modules with role-based access control, documenting architecture decisions clearly for ongoing client maintenance.
Notable Projects
MCP Expense Tracker (AI Tool Interfaces & Scaffolding)
TypeScript · MCP SDK · Claude AI API · Tool Calling · Telemetry
Designed and shipped a production MCP server integrating Claude AI as a natural-language interface. Defined custom tool schemas (add_transaction, read_transactions), built evaluation scaffolding and SSE transport via supergateway. Open-source on GitHub.
Telegram AI Assistant — Local LLM + Scaffolding
n8n · Ollama · Qwen2.5:3b · Python · Telegram API · MCP
Engineered a private, zero-cloud-cost AI assistant on Telegram using n8n workflows and a locally hosted Qwen2.5:3b model via Ollama. Integrated custom tool interfaces to execute financial queries, demonstrating local LLM orchestration and agentic tool-calling.
Open-Source npm Packages (3 Published)
React · TypeScript · JavaScript · npm · Open Source
Authored and published 3 production npm packages: satti-table, react-satti-chart, and react-pendulum-loader. Amassed 1,000–5,000+ downloads across the developer community.
Multi-Tenant Healthcare & Telemetry Platform
NestJS · FHIR R4 · Azure · AWS S3 · Kafka · Telemetry
Led backend microservices architecture for a multi-tenant platform with telemetry tracking, automated PDF generation, and Aidbox EHR 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
GenAI Engineering — Frontier Model APIs, MCP Tool Interfaces, Eval Harnesses (2025–26)
Open-source contributor — 3 published npm packages · 1,000–5,000+ downloads