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hemanjali2130/README.md

Hi, I'm Hemanjali

MS Computer Science, George Mason University ('26) — I build data platforms and evaluate AI systems. My work sits where data engineering meets AI: getting messy data into trustworthy, governed shape, then using it to build and measure intelligent systems.

📍 Virginia, USA · Open to full-time roles and internships 🔗 LinkedIn


What I work with

  • Data platforms Databricks · Snowflake · AWS (Glue, Athena, Kinesis, Lambda, Step Functions) · Azure Data Factory · Delta Lake · PySpark
  • Modeling & analysis SQL · Python · dimensional modeling (Kimball, SCD Type 2) · Power BI
  • AI LLM/VLM evaluation · benchmark design · Claude API · prompt engineering
  • Engineering practice Terraform · Git · pytest · CI-minded IaC

Selected projects

Project What it is
hb-ecommerce-lakehouse Serverless lakehouse on AWS — Kinesis ingestion, Lambda schema validation, Glue PySpark medallion pipeline to a star schema on Athena, Step Functions orchestration, 100% Terraform, live dashboard. Measured 248× scan reduction.
databricks-retail-lakehouse Medallion lakehouse on Delta Lake — Auto Loader incremental ingestion of 2.1M records, quarantine DQ gates, Kimball star schema, Unity Catalog lineage. Verified end-to-end run.
snowflake-governed-elt Event-driven ELT — Snowpipe from S3, Streams & Tasks driving incremental MERGE, SCD Type 2 dimensions, three-tier RBAC and dynamic PII masking.
azure-medallion-online-retail-etl ADF medallion ETL into Azure SQL — T-SQL MERGE for SCD2, data-quality gates that halt bad loads before reporting.
vlm-visualization-literacy Deterministic evaluation of GPT-5.4 on the 6,000-image ChartX benchmark — 85.7% 2D accuracy, a 26-point drop on 3D charts, and six design guidelines that followed from the failure modes.
dns-anomaly-detection PCAP analysis framework detecting DNS tunneling, cache poisoning, spoofing, and fast-flux botnets — entropy and TTL-based detectors with Claude API threat analysis and a Streamlit UI.

What I'm focused on next

Deepening the AI side of my portfolio — evaluation pipelines, retrieval systems, and applying LLMs to analytics problems — while keeping the data engineering foundation that makes those systems work on real data.

Pinned Loading

  1. azure-medallion-online-retail-etl azure-medallion-online-retail-etl Public

    Azure Data Factory medallion ETL on the Online Retail dataset: bronze-silver-gold into Azure SQL, T-SQL MERGE for SCD Type 2 dimensions, embedded data-quality gates that halt bad loads, Power BI re…

    TSQL

  2. databricks-retail-lakehouse databricks-retail-lakehouse Public

    Medallion lakehouse on Databricks: PySpark, Delta Lake, Auto Loader incremental ingestion of 2.1M records, quarantine DQ gates, Kimball star schema, multi-task Workflow, Unity Catalog governance. V…

    Python

  3. dns-anomaly-detection dns-anomaly-detection Public

    AI-powered PCAP analysis framework detecting DNS tunneling, cache poisoning, spoofing, and fast-flux botnets. Shannon-entropy and TTL-based detectors, Claude API threat analysis, Streamlit UI, Plot…

    Python

  4. hb-ecommerce-lakehouse hb-ecommerce-lakehouse Public

    Production-grade serverless lakehouse on AWS: Kinesis Data Firehose ingestion with in-flight Lambda schema validation, Glue PySpark medallion pipeline to a Kimball star schema on Athena, Step Funct…

    HCL

  5. snowflake-governed-elt snowflake-governed-elt Public

    Governed Snowflake warehouse with automated ELT: S3 event-driven Snowpipe ingestion, Streams & Tasks, SCD Type 2 dimensions via MERGE, three-tier RBAC and dynamic PII masking. Verified on Snowflake…

    PLpgSQL

  6. vlm-visualization-literacy vlm-visualization-literacy Public

    Research write-up: GPT-5.4 evaluated on all 6,000 ChartX images across 18 chart types. 85.7% on 2D, 51.6% on treemaps, 26-point drop on 3D bars — VLM accuracy tracks the human perceptual hierarchy.…