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Maruthan G
maruthan.dev
Open to opportunitiesChennai, India

Hi, I'm Maruthan

Full-stack developer at Finstein shipping production web and mobile apps across NestJS, Next.js, Angular, and React Native. Active OSS contributor — 57 merged PRs across VS Code, NestJS, Node.js undici, BullMQ, and more.

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01 / About

A few things about me

I'm a full-stack developer at Finstein, where I ship production web and mobile applications across NestJS, Next.js, Angular, and React Native (Expo). Before that I taught programming and robotics as a STEM instructor at LMES Academy.

What I love most is improving the tools developers depend on. I'm an active contributor to VS Code, the NestJS ecosystem (CLI, Swagger, GraphQL), Node.js undici, BullMQ, and a handful of other open source projects. 57 merged PRs and counting.

Currently upskilling in Data Engineering — Databricks, PySpark, Delta Lake, dbt, and Power BI. Based in Chennai, India.

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Merged PRs

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OSS projects

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Projects shipped

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Years professional

02 / Stack

What I build with

Production-tested across multiple roles. Items marked ◌ are areas I'm currently learning.

Languages

TypeScriptJavaScriptPythonPHPSQLScala

Frontend

Next.jsReactAngularReact NativeExpoIonicTailwind CSSRedux ToolkitD3.js

Backend

NestJSNode.jsExpressBullMQSocket.ioTypeORMWordPress / WooCommerce

Databases

PostgreSQLMySQLMariaDBRedisDelta LakeFirebase

Cloud & DevOps

AWSAzureDockerGitLab CIVercel

Data Engineering

DatabricksPySparkdbtPower BI

03 / Work

Selected projects

A subset of what I've shipped. Detailed case studies with architecture notes will live at /projects.

B2B Multi-Vendor Marketplace

Live

B2B marketplace with reverse-auction bidding, KYC/seller verification, AI-powered product creation (AWS Lambda), live chat, and dispute management. 17+ custom WordPress plugins, full Docker Compose infra, and a backup → deploy → rollback CI/CD pipeline.

WordPressWooCommercePHPMariaDBRedisDockerGitLab CIAWS Lambda

Conversational Commerce Bot

Live

Production WhatsApp ↔ WooCommerce bridge. Customers browse, manage carts, place orders, and resolve disputes via WhatsApp. HMAC-SHA256 webhook verification, idempotency via SQLite, multi-step conversation state.

NestJS 11TypeScriptSQLiteExpress 5Meta WhatsApp Cloud API

Enterprise Sales & Commerce Analytics

Live

Multi-channel analytics platform aggregating 8+ e-commerce and quick-commerce channels. Real-time dashboards, dynamic report builder, cohort analysis, 2FA/MFA (TOTP), CASL RBAC, and 192+ API endpoints.

NestJS 10Next.js 15React 18PostgreSQLRedisBullMQSocket.ioD3.js

Cross-Platform Fitness Ecosystem

Live

Mobile app, admin dashboard, and marketing site for a fitness platform. Trainer bookings, workout planning, AI coaching (GPT-4o), social fitness, real-time messaging, payment processing, push notifications.

NestJS 10React Native + Expo 51Next.js 15PostgreSQLSocket.ioOpenAI GPT-4o

Health & Wellness Mobile App

Live

Hybrid mobile app for hydration tracking, step counting, and health goal management with Keycloak-based SSO and Firebase push notifications.

NestJS 10Angular 18Ionic 8Capacitor 6MySQLKeycloakFirebase

Enterprise Data Warehouse

Learning

Medallion architecture (Bronze → Silver → Gold) powering executive Power BI dashboards in the insurance domain. SCD Type 1/2, Delta Lake optimizations, and Databricks Asset Bundles for IaC.

DatabricksPySparkScalaDelta LakedbtAzure ADLSPower BI

04 / Open Source

Open source contributions

The work I'm proudest of. Full table with every PR will live at /oss.

57

Merged PRs

103

Open PRs in flight

9

OSS projects

Recent merged highlights

nodejs/undici#5066

fix(interceptor): add throwOnMaxRedirect to types and interceptor opts

microsoft/vscode#307960

fix: handle heredoc/multiline commands in terminal tool execution

nestjs/graphql#3937

fix(apollo): respect useGlobalPrefix on custom subscription path

View every PR →

Currently contributing to

nestjs/nest-cli (15 merged · 2 open)nestjs/swagger (14 merged · 0 open)microsoft/vscode (12 merged · 46 open)nestjs/graphql (6 merged · 0 open)nodejs/undici (4 merged · 2 open)taskforcesh/bullmq (3 merged · 13 open)angular/angular-cli (2 merged · 3 open)

05 / Contact

Let's talk

Hiring, collaboration, or just saying hi — all welcome.

Direct line: maruthangt@gmail.com

Find me elsewhere