Purnendu Das

AI Researcher

West Bengal, India5 yrs 9 mos experience
AI EnabledAI ML Practitioner

Key Highlights

  • 5+ years in Data Science across Retail and Finance.
  • Expert in Generative AI and advanced data analytics.
  • Proven track record of optimizing business operations.
Stackforce AI infers this person is a Data Science expert with a strong focus on Generative AI in Fintech and Healthcare.

Contact

Skills

Core Skills

Generative AiCloud ArchitectureData ScienceData EngineeringWeb Development

Other Skills

Amazon Web Services (AWS)Analytical SkillsApplication Programming Interfaces (API)Back-End Web DevelopmentBitbucketBootstrapBusiness InsightsC (Programming Language)Cascading Style Sheets (CSS)CommunicationData AnalysisData AnalyticsData ModelingData StructuresData Visualization

About

As a dedicated Data Science professional with 5+ years of experience in Retail and Finance domains I specialize in Generative AI, advanced data analytics, and cloud-based solutions. My journey has taken me through impactful roles at PwC & Cognizant where I have developed AI-driven solutions that elevate business operations and sharpen decision-making. Handson AWS Skills : Sagemaker, S3, EC2, Lambda, Glue, EventBridge, OpenSearch, SecretManager, WAF, API Gateway, RDS, DynamoDB, etc. In my previous role as a Generative AI Associate at PwC, I lead the integration of cutting-edge AI capabilities into internal tools, optimizing risk assessments and enhancing project workflows. Previously, at Cognizant, I contributed to GenAI innovations involving LLMs, LangChain, Langgraph, and Pinecone Vector Databases to create solutions like chatbots and RAG-based models, earning multiple awards and recognition for my efforts. Core Competencies: 🔹 Generative AI & Large Language Models Expertise in LLMOps, RAG, Langgraph and advanced tools such as Langchain, GPT, Gemini, and Llama, building scalable and impactful AI solutions. 🔹 Data Science & Analytics Strong proficiency with Python, Pandas, Scikit-Learn, and Plotly for in-depth data analysis and modeling, providing insights that drive strategic decisions. 🔹 Cloud Architecture & Optimization Hands-on experience with GCP, AWS, and Azure, specializing in efficient workflow and ETL pipeline design that reduces both time and costs. I am driven to leverage AI and data science to solve complex business challenges and am always eager to connect with like-minded professionals who share a passion for the transformative potential of AI and data-driven insights. Let’s connect!

Experience

5 yrs 9 mos
Total Experience
1 yr 2 mos
Average Tenure
10 mos
Current Experience

Epam systems

Senior GenAi Developer

Aug 2025Present · 10 mos · Bengaluru, Karnataka, India · Remote

  • Building Genai solution.

Pwc

GenAi Associate 2

Aug 2024Aug 2025 · 1 yr · Bengaluru, Karnataka, India · Hybrid

  • ● Designed and implemented multi-agent-based microservices for a GenAI-powered medical application on AWS, enhancing processing speed by 60%.
  • ● Developed RAG-based solutions for a leading US finance client in AWS, improving data retrieval accuracy by 40%
  • ● Led the development of an LLM-powered Project Risk Checking tool, integrating Multi-AI Agent mitigation strategies, reducing risk assessment time by 70%
  • ● Optimized Q&A bot performance by implementing Chain parallelism techniques, reducing execution time by 68% and improving user experience.
  • ● 12x Awarded by my delivery head, director, manager, colleagues
Amazon Web Services (AWS)FastAPIGenerative AICloud Architecture

Cognizant

Data Scientist

Sep 2022Aug 2024 · 1 yr 11 mos · Kolkata, West Bengal, India · Hybrid

  • ● Contributed to an internal R&D team to drive innovation in GenAi features in AWS cloud.
  • ● Utilized Azure OpenAI, LangChain, GPT3.5, and Gemini Pro LLMs for GenAi development.
  • ● Built and deployed a GenAI-powered chatbot using Pinecone vector database and RAG pipeline, improving response accuracy by 35% and cutting query processing time.
  • ● Worked with GenAi based approaches for auto linking between business terms and technical metadata.
  • ● Help of GenAi, removed partially duplicate records from database.
  • ● Developed SQL queries to optimize performance for high-volume data using PostgreSQL database.
  • ● Enforced compliance with security standards (SAST, Checkmarx, SONAR, Black Duck), ensuring 100% regulatory adherence across all AI models.
  • ● 4x awarded by director, manager, Ai leadership team like - “CODE AS ONE” ,” ALWAYS STRIVING”, “BEST NEWCOMER”, Anula award - “RISING STAR”.
Data ModelingLarge Language Models (LLM)VisualizationMachine LearningBusiness InsightsProblem Solving+12

Tata consultancy services

Data Engineer

Mar 2021Sep 2022 · 1 yr 6 mos · Kolkata, West Bengal, India

  • ● Worked as data engineer, mainly focused on ETL (data migration) projects on Google Cloud Platform.
  • ● Utilized GCP Cloud Functions for streamlined data processing.
  • ● Developed efficient Airflow Scripts, reducing costs by over 40% and saving 80% of manual efforts and time.
  • ● Created Python Cloud Function for Mismatch query generation, saving over 40 minutes of manual effort.
  • ● Developed JIRA stats cloud function to visualize our workflow, defects counts, test case counts, tasks status, and many useful stats.
  • ● As a offshore team member collaborated with onshore team and clients for gathering and analyzing the requirements.
  • ● Worked on Google Cloud Platform , Cloud function , Bigquery , Airflow , Dataflow , SQL developer , CICD jenkins , Docker, Bitbucket , Looker.
BitbucketData ModelingVisualizationBusiness InsightsProblem SolvingDatabases+14

Oneness tech solutions

Full Stack Web developer (Django)

Aug 2020Feb 2021 · 6 mos · Kolkata, West Bengal, India

  • ● Developed a machine learning based Django application to forecast insights using business parameter inputs.
  • ● Implemented SEO strategies for the client’s site, resulting in a 65% increase in traffic.
  • ● Stack used : Python, SQL, Data Science , Django, Bootstrap, REST API, Ajax, JavaScript, HTML, CSS.
Data ModelingVisualizationBusiness InsightsProblem SolvingData AnalysisApplication Programming Interfaces (API)+7

Codespeedy technology private limited

Python Developer (Intern)

Apr 2019Jun 2019 · 2 mos · Baharampur Area, India

  • ● Developed weather forecasting python application.
  • ● Developed an application to generate their Internship Certificates.
  • ● Multi-threaded client server internal chatting application (Python).
  • ● Wrote Python Contents on their website.
VisualizationBusiness InsightsProblem SolvingData AnalysisCommunicationBootstrap+3

Education

Government College of Engineering and Textile Technology, Berhampore

Bachelor of Technology - BTech — cse

Jan 2016Jan 2020

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