PBPriyabrata BeraStaff Frontend Engineer | Frontend Architect | Full-Stack Developer | AI Engineer
Immediate Joiner for senior frontend roles in 2026

Staff Frontend Engineer | Frontend Architect | Full-Stack Developer | AI Engineer

React.js · Next.js · JavaScript · TypeScript · Tailwind CSS · Node.js · REST API · Python · FastAPI · GenAI · RAG · LLM

Frontend Architect and Tech Lead with 15+ years building scalable, high-performance web applications across media, banking, ecommerce, and enterprise platforms — now building end-to-end GenAI applications with LLM integration and RAG pipelines.

15+Years Experience
Core Web VitalsPerformance Optimization
4AI Dev Tools
7GenAI Projects
42UI Projects

About

Frontend leadership with product focus

I build frontend systems that balance product speed, engineering quality, search visibility, and long-term maintainability.

Frontend Architect and Tech Lead with 15+ years building scalable, high-performance web applications across media, banking, ecommerce, and enterprise platforms.

Builds end-to-end GenAI applications — LLM integration, RAG pipelines, streaming responses, and local inference with Ollama.

Led large-scale frontend migrations to React.js, Next.js, and TypeScript, improving Core Web Vitals across flagship products.

Designed a centralized configuration management platform deployed across 8 repositories, standardizing implementation patterns for new properties.

Migrated legacy XSLT applications to modern Next.js architecture, improving accessibility, maintainability, and performance.

Mentors engineering teams and integrates AI-assisted tools (Claude, ChatGPT, Cursor, Codex) to accelerate delivery.

AI / GenAI Projects

Self-driven GenAI applications: LLM, RAG, and streaming

Self-initiated projects built outside of professional work to explore end-to-end GenAI application development — LLM integration, RAG pipelines, streaming responses, and local inference with Ollama.

AI Conversational Assistant

Next.jsReact.jsNode.js / PythonFastAPIOllamaStreamingLLM
  • Built an end-to-end AI conversational application using Next.js/React.js and locally hosted Ollama LLMs.
  • Developed backend APIs with FastAPI/Node.js for LLM interaction and conversation management.
  • Implemented streaming AI responses for a real-time experience, with conversation memory to maintain context across interactions.
  • Designed an LLM provider abstraction layer supporting multiple providers, with configurable system-prompt management to control model behavior.

RAG-Based Document Intelligence Application

Next.jsReact.jsPythonFastAPIChromaDBEmbeddingsOllamaRAG
  • Built an end-to-end Retrieval-Augmented Generation (RAG) application for intelligent question answering over PDF documents.
  • Implemented PDF extraction, text chunking, embedding generation, and vector storage in ChromaDB with semantic retrieval of the most relevant chunks per query.
  • Applied grounded prompting to constrain responses to retrieved context and reduce hallucinations; integrated Ollama for local inference with streaming through FastAPI.
  • Added source citations with document name, page number, and relevant content snippets.
  • Designed modular backend services separating document processing, embeddings, retrieval, prompt construction, and generation.

AI Personalized News Intelligence Platform

Next.jsReact.jsPythonFastAPIEmbeddingsVector SearchOllamaLLM
  • Built a GenAI platform that aggregates news and delivers personalized, topic-aware feeds using embeddings and semantic vector search.
  • Generated concise, LLM-powered summaries of long-form articles for faster reading, with streaming responses served through FastAPI.
  • Modeled reader interests from engagement signals to rank and recommend the most relevant stories per user.
  • Integrated locally hosted Ollama LLMs for summarization and semantic understanding, keeping inference private and low-cost.

Skills

Frontend, backend, cloud, and AI skills

Frontend

React.jsNext.jsTypeScriptJavaScript (ES6+/ES5)ReduxHTML5CSS3jQueryResponsive DesignFigma

Backend / API

Node.jsREST APIsJWT AuthenticationAxiosJSONMongoDBPythonFastAPI

GenAI / AI Engineering

LLM IntegrationRAGOllamaChromaDBEmbeddingsPrompt EngineeringStreaming ResponsesVector Search

Performance & SEO

Core Web VitalsLighthouseGoogle Search ConsoleChrome DevToolsSSR

Cloud & DevOps

AWSLinode (Akamai Cloud)GitGitHubBitbucketJenkins

AI-Assisted Development

ClaudeChatGPTCursorCodex

Projects

Featured product work and migrations

View all project highlights
Featured

AI Conversational Assistant

End-to-end AI conversational app using Next.js/React.js and locally hosted Ollama LLMs, with streaming responses and conversation memory.

Next.jsFastAPIOllamaLLM
My role
Personal / Self-Driven
Key impact
Real-time streaming chat with an LLM provider abstraction layer and configurable system prompts.
Featured

RAG-Based Document Intelligence

Retrieval-Augmented Generation app for question answering over PDFs, with embeddings, vector search, and grounded, cited answers.

Next.jsPythonChromaDBRAG
My role
Personal / Self-Driven
Key impact
Grounded responses with source citations (document, page, snippet) and reduced hallucinations.
Featured

AI Personalized News Intelligence Platform

GenAI platform delivering personalized, topic-aware news feeds with embeddings, semantic search, and LLM-powered article summaries.

Next.jsFastAPIEmbeddingsOllama
My role
Personal / Self-Driven
Key impact
Personalized recommendations and concise summaries with private, local LLM inference.
Featured

Centralized Configuration Management Platform

Configuration management platform standardizing implementation patterns across 8 repositories at The Economic Times.

Next.jsReact.jsNode.js
My role
Tech Lead
Key impact
Cut integration time for new properties and standardized patterns across flagship products.
Project

Internal Admin Panels

Management and subscription admin panels giving business teams self-serve control over configurable content and data.

Next.jsReact.jsNode.js
My role
Tech Lead
Key impact
Removed engineering dependency for day-to-day content and subscription changes.
Project

XSLT to Next.js Migration

Large-scale migration of legacy XSLT applications to a modern Next.js architecture across flagship Economic Times products.

Next.jsSSRMigration
My role
Tech Lead
Key impact
Improved accessibility, maintainability, and Core Web Vitals scores.
Project

FedEx Print Online

Enterprise document printing, customization, and order management platform built at Infogain.

React.jsJavaScriptCanJSAJAX
My role
Sr. Consultant
Key impact
Delivered scalable printing and order management capabilities for a global enterprise customer.

Case Studies

Selected project case studies

RAG-Based Document Intelligence Application

Screenshots placeholder

Problem

Extracting reliable answers from large PDF documents is slow and error-prone, and general LLMs hallucinate without grounding in the source material.

Solution

Built an end-to-end RAG pipeline — PDF extraction, text chunking, embeddings, and ChromaDB vector storage — with semantic retrieval and grounded prompting, served through FastAPI and Ollama.

Tech Stack

Next.jsPythonFastAPIChromaDBOllamaRAG

My Role

Personal / Self-Driven

Key Features

  • PDF extraction and text chunking
  • Embedding generation with ChromaDB vector search
  • Grounded prompting to reduce hallucinations
  • Source citations with document, page, and snippet

Impact

Accurate, cited answers grounded in document context, with local streaming inference via Ollama and FastAPI.

AI Conversational Assistant

Screenshots placeholder

Problem

Building a real-time conversational AI that maintains context across turns without being locked to a single LLM provider.

Solution

Built a streaming chat application on Next.js/React.js with a FastAPI/Node.js backend, conversation memory, and an LLM provider abstraction layer.

Tech Stack

Next.jsReact.jsFastAPINode.jsOllamaLLM

My Role

Personal / Self-Driven

Key Features

  • Streaming AI responses
  • Conversation memory across interactions
  • LLM provider abstraction layer
  • Configurable system-prompt management

Impact

A responsive, provider-agnostic conversational experience running on locally hosted Ollama models.

Centralized Configuration Management Platform

Screenshots placeholder

Problem

Implementation patterns were inconsistent across properties and slow to extend to new repositories, lacking a single standard.

Solution

Designed and built a centralized configuration management platform (Next.js, React.js, Node.js) deployed across 8 repositories to standardize implementation.

Tech Stack

Next.jsReact.jsNode.js

My Role

Tech Lead

Key Features

  • Centralized configuration management
  • Cross-repository standardization
  • Self-serve business tooling
  • Reusable implementation patterns

Impact

Standardized implementation across 8 repositories and cut integration time for new properties.

Legacy XSLT to Next.js Migration

Screenshots placeholder

Problem

Flagship pages ran on legacy XSLT, limiting accessibility, maintainability, and further performance improvements.

Solution

Directed a large-scale migration to React.js, Next.js, and TypeScript with a focus on SSR and Core Web Vitals.

Tech Stack

Next.jsReact.jsTypeScriptSSR

My Role

Tech Lead

Key Features

  • SSR-based rendering
  • Improved Core Web Vitals
  • Modern component architecture
  • Accessibility improvements

Impact

Measurable Core Web Vitals gains and a more maintainable codebase across flagship products.

Experience

Career timeline and leadership path

May 2019 to PresentNoida, India

The Economic Times (Times Internet)

Tech Lead – Front End Development

  • Directed frontend architecture and led large-scale migration initiatives to React.js, Next.js, and TypeScript, improving Core Web Vitals scores and overall application performance across flagship products.
  • Migrated legacy XSLT applications to modern Next.js architecture, improving accessibility, maintainability, and page performance.
  • Designed and built a centralized configuration management platform (Next.js, React.js, Node.js) deployed across 8 repositories, standardizing implementation patterns and cutting integration time for new properties.
  • Built and shipped multiple internal admin panels (Next.js, React.js) — including management and subscription tools — giving business teams self-serve control over configurable content and data.
  • Mentored a team of frontend engineers, leading development for Economic Times Web and Mobile Web platforms and establishing engineering best practices.
  • Integrated AI-assisted development tools (Claude, ChatGPT, Cursor, Codex) into team workflows, improving code review turnaround and production velocity.
Mar 2016 to May 2019Noida, India

Infogain India Private Limited

Sr. Consultant

  • Developed and enhanced the FedEx Print Online enterprise platform using React.js, JavaScript, CanJS, HTML5, CSS3, AJAX, and JSON, delivering scalable document printing, customization, and order management capabilities.
Jan 2014 to Mar 2016Pune, India

Capgemini India Private Limited

Consultant

  • Built secure, scalable online banking features for the HSBC Banking Platform using JavaScript, Dojo, jQuery, AJAX, HTML5, CSS3, and JSON.
Oct 2011 to Sep 2013Noida, India

Samsung India Software Centre

Senior Software Engineer

  • Developed Smart TV applications using JavaScript, HTML5, and the Samsung SDK.
  • Led a multithreading migration initiative across 200+ Smart TV applications.
  • Received the Best Mentor Award (2012) for outstanding contribution to team development.
Mar 2011 to Oct 2011Noida, India

ONS Interactive Solutions Pvt. Ltd

Senior Software Engineer

  • Enhanced enterprise e-commerce platforms using PHP, MySQL, JavaScript, jQuery, AJAX, and Magento, delivering new features, bug fixes, and performance improvements.
Oct 2008 to Mar 2011Noida, India

Chetu (I) Pvt. Ltd

Software Engineer

  • Built scalable e-commerce solutions for PC Game Supply using PHP, MySQL, JavaScript, jQuery, and AJAX, including secure payment workflows and digital product delivery.

Resume

ATS-friendly summary for recruiters

Professional Summary

Frontend Architect and Tech Lead with 15+ years of experience building scalable, high-performance web applications for media, banking, ecommerce, and enterprise platforms. Expert in React.js, Next.js, TypeScript, JavaScript, Node.js, frontend architecture, performance optimization, and engineering leadership. Led large-scale frontend modernization initiatives, mentored engineering teams, and delivered business-critical products used by millions of users. Hands-on with GenAI application development, including LLM integration, RAG pipelines, and AI-assisted engineering workflows using Claude, ChatGPT, Cursor, and Codex. Strong focus on Core Web Vitals, SSR, REST API design, and frontend performance optimization.

Highlights

  • 15+ years building scalable, high-performance web applications across media, banking, ecommerce, and enterprise platforms.
  • Hands-on GenAI application development: LLM integration, RAG pipelines, streaming responses, and local inference with Ollama.
  • Proven track record leading large-scale Next.js migrations and mentoring frontend engineering teams.

AI Developer Workflow

Faster delivery with AI-assisted engineering

  • Built self-driven GenAI applications: a streaming conversational assistant and a RAG document-intelligence app.
  • ChatGPT and Claude for architecture planning, debugging, and technical documentation.
  • Cursor and Codex for code generation, refactoring, and faster implementation.
  • AI-assisted code review integrated into team workflows, improving turnaround and production velocity.
  • Mentors engineers on integrating AI tools responsibly into day-to-day development.
  • Actively expanding skills in Python, GenAI tooling, and automation.

Blog

Technical article ideas

RAG

Building a RAG Document Intelligence App with ChromaDB and Ollama

PDF extraction, chunking, embeddings, and grounded prompting for accurate, cited answers over your own documents.

LLM

Streaming Responses and Conversation Memory in a Next.js AI App

Designing a real-time conversational assistant with an LLM provider abstraction layer and configurable system prompts.

Next.js

Migrating Legacy XSLT to Next.js at Scale

Lessons from migrating high-traffic pages to Next.js without sacrificing SEO or Core Web Vitals.

Performance

Core Web Vitals for High-Traffic Content Sites

Practical techniques for improving LCP, INP, and CLS on content-dense pages.

AI Workflow

Using Claude, ChatGPT, Cursor, and Codex in a Production Team

How AI-assisted development tools fit into a disciplined, review-driven engineering workflow.

Contact

Let's build your next frontend product

Immediate Joiner available for Staff Frontend Engineer, Frontend Architect, React/Next.js Developer, Full-Stack Developer, and AI Engineer roles.

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