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.
Experience
5+ years building AI systems that drive real business impact
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
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
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)
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
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
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
Education
Bachelor of Technology (B.Tech)
Computer Science & Engineering
Government College of Engineering and Textile Technology, Berhampore
Core Skills
Technologies and frameworks I use to build scalable AI solutions
Generative AI & LLM
Programming & Development
Cloud & Infrastructure
What People Say
Recommendations from colleagues and leaders I've worked with
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.
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.
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.
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.
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.
Certifications
Industry-recognized credentials validating my expertise
Apache Airflow Fundamentals
Astronomer
LangChain 101 for Beginners (OpenAI/ChatGPT/LLMOps)
Udemy
SQL - Intermediate
HackerRank
Python
HackerRank
Google IT Support Specialization
Google (Coursera)
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
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.