Harsh Prajapati | Software Engineer | MERN & Next.js Developer

What I do.

Hey, I'm Harsh — a Full Stack Developer with 3+ years shipping production web applications, now applying that foundation to Generative AI engineering. I'm most confident on the backend — REST API design, Node.js, PostgreSQL, MongoDB, AWS, Docker, and CI/CD. I've built systems from schema design through to cloud deployment, and I care about code built to scale.

On the GenAI side, I built SourceLab, a full-stack RAG research workspace inspired by Gemini Notebook — ingestion pipelines for multiple source types, per-workspace vector search with Pinecone, streaming chat with inline citations, and guardrails built to eliminate hallucinations. On the frontend I work with React.js, Next.js, and TypeScript — as an engineer, not a designer. Currently at Merkle, shipping backend tooling for global enterprise clients. Next: backend systems, cloud infrastructure, or full-time AI engineering.

React.js
Next.js
MongoDB
AWS
LangChain

RAG & Generative AI
TypeScript
Node.js
PostgreSQL
Docker

Places I've worked.

Since 2023, I've worked with a few companies that shaped how I build software — from client-facing production systems to full-stack ownership of AI products end-to-end. Currently, I'm at Merkle. Merkle.

Software Developer#Merkle Advertising Services

Jun 2023 - Present

Planned and built REST APIs end-to-end - architecture, development, QA, and staging-to-production rollout - coordinating with external client teams to scope requirements; led a domain-wide chatbot integration (AWS Lambda CRUD functions, Postman QA, CloudWatch monitoring) for Q&A and lead generation to secure additional SOW and revenue.
Architected server-side GTM implementations, including Google Tag Gateway setups for multiple clients to improve first-party data accuracy, and used AI-assisted audits to optimize GTM and Tealium tagging, driving notable CWV score improvement across client sites; leveraged GTM for dynamic GA4 and media pixel tracking to eliminate redundancy, and designed nonce-ready architectures to harden against XSS attacks.
Earned Braze Developer Certification and led Braze integrations for client platforms - building automated remarketing flows based on custom user behavior, data ingestion pipelines, push notifications, in-app messages, and content cards, contributing to significant improvement in engagement and conversion.
Integrated Tealium, an enterprise customer data orchestration solution, across client accounts - including custom dataLayer implementations, Enhanced Ecommerce tracking, and Measurement Protocol setups; handled AI-assisted audits of custom script ingestions, leveraging Tealium's pre-built tag library to accelerate custom tagging and reduce XSS injection risk.

Some of my works.

A selection of production-ready platforms and systems I've built across full-stack engineering, analytics, and cloud deployments.

#01 SourceLab

SourceLab — A multi-workspace RAG research assistant that goes beyond basic retrieval, using query transformation and Corrective RAG to catch bad retrievals before they hallucinate. Add PDFs, websites, YouTube, or text and get streamed, cited answers.

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#02 Curiomart

A multi-vendor e-commerce CMS built using the MERN stack. Features include role-based authentication, real-time chat with Socket.IO, Stripe payment integration, and a responsive admin dashboard. Deployed on AWS EC2 for production scalability.

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#03 CreatorForge

A client-side YouTube thumbnail generator powered by Gemini AI. Your API key, images, and prompts never leave the browser — no accounts, no cloud storage, just fast local generation.

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#04 WealthFox

A production-grade financial advisory platform built with Next.js and Tailwind CSS. Integrated GA4 via GTM, Google Places reviews with MongoDB TTL caching, SEO optimization, and automated lead capture synced with Odoo CRM.

Live

#05 Trimly

Trimly was built to explore Supabase and shadcn/ui in a real project. It's a URL shortener with a clean analytics dashboard where users can create short links, track clicks, and view link performance.

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#06 iamharsh.in

Designed and developed a personal portfolio using Next.js, TypeScript, and Chakra UI, highlighting projects in full-stack development, analytics engineering, and cloud deployments.

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