Hi, I'm Purnendu Das

Experience

1. Senior GenAI Developer @ EPAM Systems

   Aug 2025 – Present

   Bengaluru, India · Remote

   • 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
   • Serving as a Certified Technical Interviewer (A3-Level), evaluating 50+ candidates
   • Recipient of the Delivery Head Award for innovation in high-complexity AI initiatives

2. GenAI Associate 2 @ PwC

   Aug 2024 – Aug 2025

   Bengaluru, India · Hybrid

   • 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
   • Optimized LLM orchestration via Chain Parallelism (68% inference time reduction)
   • Received 9 awards from Project Manager, Delivery Head, and Partner for GenAI innovation and delivery excellence

3. Data Scientist @ Cognizant

   Sep 2022 – Aug 2024

   Kolkata, India · Hybrid

   • 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)
   • Established DevSecOps with 100% regulatory compliance across all AI models
   • Received 7 leadership awards including 'Rising Star' (Anula Award) and 'Code As One', plus a 5/5 annual rating (Top 1%)

4. Data Engineer @ Tata Consultancy Services

   Mar 2021 – Sep 2022

   Kolkata, India

   • 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
   • Built high-throughput pipelines with BigQuery, Dataflow, and SQL (99.9% uptime)
   • Integrated Docker, Jenkins, and Bitbucket for CI/CD excellence

5. Full Stack Web Developer (Django) @ Oneness Tech Solutions

   Aug 2020 – Feb 2021

   Kolkata, India · Remote

   • 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

6. Python Developer (Intern) @ CodeSpeedy Technology

   Apr 2019 – Jun 2019

   Baharampur, India

   • 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