Available for new opportunities

Hi, I'm Purnendu Das

I architect production-grade AI systems that actually work at scale.

Senior GenAI Developer with 5+ years transforming experimental AI into enterprise solutions across finance, retail, and healthcare. Specialized in RAG architectures, Multi-Agent systems, and LLMOps.

5+
Years Experience
20+
AI Projects Shipped
3
Industries Impacted
Purnendu Das
GenAI
RAG
LLMOps
Agents
LangChain
Vector DB
LangGraph
AWS
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Career Journey

Experience

5+ years building AI systems that drive real business impact

Aug 2025 – Present Bengaluru, India · Remote

Senior GenAI Developer

@ EPAM Systems

  • Architecting an enterprise-grade Hybrid RAG system on AWS (Bedrock, OpenSearch, Lambda) for a Tier-1 US Finance client
  • Orchestrating end-to-end Chat Engine lifecycles with sub-second inference latency
  • Implementing PEFT and LoRA fine-tuning strategies for LLaMA and Gemma models
Aug 2024 – Aug 2025 Bengaluru, India · Hybrid

GenAI Associate 2

@ PwC

  • Architected high-concurrency Multi-Agent microservice ecosystem on AWS for healthcare platform (60% efficiency uplift)
  • Engineered enterprise-grade RAG pipelines for US Financial client (40% accuracy improvement)
  • Pioneered LLM-driven Risk Intelligence engine with 70% latency reduction
Sep 2022 – Aug 2024 Kolkata, India · Hybrid

Data Scientist

@ Cognizant

  • Spearheaded R&D in the Generative AI Lab, transitioning experimental AI features to production on AWS
  • Architected Multi-Model GenAI Workflows using LangChain, Azure OpenAI, and Gemini Pro
  • Built a Semantic Search Engine with Pinecone (35% accuracy uplift)
Mar 2021 – Sep 2022 Kolkata, India

Data Engineer

@ Tata Consultancy Services

  • Engineered scalable Cloud-Native ETL on GCP for enterprise analytics
  • Overhauled Apache Airflow orchestration (40% cost reduction, 80% automation)
  • Developed serverless Python Cloud Functions for automated data validation
Aug 2020 – Feb 2021 Kolkata, India · Remote

Full Stack Developer (Django)

@ Oneness Tech Solutions

  • Architected a Full-Stack Predictive Analytics Platform with Django and Python
  • Engineered RESTful APIs and responsive interfaces with Ajax/JavaScript
  • Achieved 65% increase in organic web traffic through SEO optimization
Apr 2019 – Jun 2019 Baharampur, India

Python Developer (Intern)

@ CodeSpeedy Technology

  • Engineered Real-Time Weather Analytics Application with REST API integrations
  • Developed automated document generation engine for internship certifications
  • Architected Multi-Threaded Communication Framework using Python socket programming
Academic Background

Education

🎓
2016 – 2020 CGPA: 8.15/10

Bachelor of Technology (B.Tech)

Computer Science & Engineering

Government College of Engineering and Textile Technology, Berhampore

Coding Club Photography Club Alumni Portal Developer
Expertise

Core Skills

Technologies and frameworks I use to build scalable AI solutions

View all skills
🧠

Generative AI & LLM

Generative AI Architecture Large Language Models (LLM) LangGraph & LangChain LLMOps Retrieval-Augmented Generation (RAG) Vector Databases (Pinecone, OpenSearch) +4 more
💻

Programming & Development

Python FastAPI Django JavaScript HTML5 SQL +6 more
☁️

Cloud & Infrastructure

Amazon Web Services (AWS) Google Cloud Platform (GCP) AWS Bedrock AWS Lambda BigQuery Dataflow +4 more
Testimonials

What People Say

Recommendations from colleagues and leaders I've worked with

View all on LinkedIn
"

I've had the pleasure of working with Purnendu on a generative AI application, and I'm consistently impressed by his broad technical expertise and deep commitment to delivering quality outcomes. Purnendu brings a thoughtful, solutions-oriented mindset to every challenge, and his ability to navigate complex technical problems has been a key asset to our project. He's a collaborative team member and someone I'd be happy to work with again in the future.

DS

Daniel Semerjyan

AI & Cloud Delivery Architect @ PwC

"

Throughout the project, Purnendu played a pivotal role in designing, fine-tuning, and deploying the solution. Their deep understanding of machine learning, API integration, vector databases and ability to rapidly prototype ideas made them stand out. They also collaborated well with cross-functional teams, translating AI concepts into clear business value. Their contributions not only accelerated delivery but also brought innovation into how we approach automation and knowledge management.

SZA

Shaik Zameer Ahamed

Gen AI QA | Conversational AI @ PwC

"

He is capable of creating wonders, it's a pleasure working with him in same team. I admire his python problem solving skills and logical ideas, talented people like him are rare nowadays. Would definitely recommend him to anyone, for all technical related supports.

SCB

Shiv Charan B

Applied AI Engineer - Generative AI @ Cognizant

"

I have worked with him in the same project. He has excellent analytical skills and he always helped me whenever I feel stuck. He has really good knowledge in python and GCP. I got to learn many things from him. He always gives 100% to his work. It was a great experience working with him.

SD

SRESHTHA DEY

Senior Consultant @ Capgemini (Ex-TCS)

"

He is a good coder with excellent analytical skill. While giving any programming task to him, he never tells he cannot do this task. He always says yes I will try and he makes it done in no time. One more thing I love about him is his love for solving a problem. I strongly believe that he will achieve great success in the field of computer science with his brilliant programming skills.

SAM

Saruque Ahamed Mollick

Managing Director @ CodeSpeedy Technology

Credentials

Certifications

Industry-recognized credentials validating my expertise

View all certifications

Apache Airflow Fundamentals

Astronomer

LangChain 101 for Beginners (OpenAI/ChatGPT/LLMOps)

Udemy

SQL - Intermediate

HackerRank

Python

HackerRank

Google IT Support Specialization

Google (Coursera)

Recognition

Awards & Achievements

Recognized for technical excellence and innovation across organizations

Delivery Head Award

@ EPAM Systems · 2025

12 Leadership Commendations

@ PwC · 2024-2025

Rising Star - Best Newcomer (Anula Award)

@ Cognizant · Jan 2024

Code As One Award

@ Cognizant · Jun 2023

IRA Top Performer (All India)

@ TCS · Mar 2021

🚀 Ready to collaborate

Let's Build the
Future of AI Together

Looking for a GenAI expert who can turn your AI vision into production-ready reality? I'd love to hear about your project.