Sanjay Das

sanjay@sanjaydas.com | 732-443-0838

Long Branch, NJ, USA | US Citizen 

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Dedicated and results-driven Engineer/ Leader with over a decade of experience in architecting and implementing robust data platforms and AI/ML solutions. Skilled in leading cross-functional teams to deliver high-quality results within deadlines. Adept at leveraging cutting-edge technologies for scalability, performance, and reliability.

Education: M. Sc (Tech) Computer Science, First Class

Birla Institute of Technology and Science (BITS), Pilani, India

Technical Skills:

• Programming Languages: Java, Scala, Python, C++

• Big Data: Spark, Kafka, Hadoop, Clickhouse, Databricks, Dremio, Airflow

• Cloud Platforms: AWS, Microservices, Kubernetes

• Databases: Oracle, MySQL, ElasticSearch, Vector Databases

• AI/ML: LLMs, RAG, Vector Embeddings, Fine-tuning, Hugging Face, LangGraph

• Other: AdTech, FinTech, HealthTech

Work Experience:

Principal Engineer, TD Securities, New York, NY (May 2025 - Now)

• Optimized GenAI app data pipelines for inference-time requirements, ensuring efficient data delivery and processing.

• Evaluated and proof-of-concept tested MCP servers from multiple vendors to determine best-fit solutions.

• Designed and implemented robust authentication and authorization solutions to secure sensitive data access using Unity Catalog.

• Developed versatile data delivery solutions, supporting multiple formats (Delta, Iceberg, Parquet) and channels (Databricks, Dremio, etc.) for diverse consumer needs.

Director / Staff Engineer - Data Engineering, AdMarketplace, New York, NY (October 2020 - Nov 2024)

• GenAI Backend:

  • Evaluated and Fine-tuned vector embedding models

  • Created data ingestion pipelines for Apache Lucene Vector Database

  • Developed microservices for embedding generation

  • Implemented RAG pipelines with KNN-search capabilities

• Design, build, and maintain core tools and Data products.

• Improve and optimize data pipelines for scalability, performance, and reliability.

• Lead the migration from legacy Data Warehouse to modern Data Lake, Warehouse, and Data Mart.

• Develop proof-of-concept/reference implementations for components and pipelines.

Consultant, Cigna/CVS-Health, New York, NY (Remote), October 2019 - September 2020

• Developed, deployed, and monitored a Big Data platform for internal/external access to Med/Rx Claims.

• Handled high-volume data transactions and resolved throughput/latency issues.

• Provided mentorship to junior engineers and conducted code reviews.

Principal Software Engineer, ETrade, New Jersey/New York, April 2017 - October 2019

• Engineered a Big Data platform for internal/external access to various data sets.

• Managed near-live market data and ingested event streams from external vendors.

• Developed Java Kafka-KStream modules and provided mentorship to junior engineers.

Earlier Roles:

• Consultant, New Jersey/New York, June 2014 - January 2017

  • Designed and developed solutions for the ingestion and processing of massive batch data for CitiBank.

  • Managed and maintained consumer-facing Android/iOS apps and responsive web front-end for esPronto.

• Cofounder/CTO, New Jersey/India, Apr 2009 - January 2014

  • Architected and Developed an on-line Stock Trading and cloud based Algo Trading System that can spawn off an Amazon EC2 container with private access to Market Data Cloud, Virtual Exchange and suite of Algorithms.

• Software Engineer: Archeus Capital, New York, NY, Morgan Stanley, New York, NY,  Wit SoundView (Start-up Broker), New York, NY, Goldman Sachs, Princeton, NJ