I'm a Senior Data Engineer at TD Bank, building production-scale data platforms using the full modern data engineering stack. Beyond my day job, I write for 8,500+ followers on Medium, weekly deep-dives on the exact topics that show up in senior data engineering interviews. Not theory. Real patterns, real answers, real trade-offs. What I work with daily: PySpark · Apache Spark · Spark Streaming Databricks · Apache Kafka · Apache Airflow · Azure (ADLS, ADF, Event Hubs) · SQL (Advanced) · Python · Delta Lake · Apache Iceberg · dbt · Snowflake · ETL/ELT Design · Data Modeling (Star Schema, Data Vault, Medallion Architecture) · Slowly Changing Dimensions · CDC (Change Data Capture) · Real-Time Streaming Pipelines · Data Quality & Observability · System Design for Data Engineers · DSA for Coding Rounds On Topmate I help you with: 🎯 Interview Prep: ETL & pipeline system design, Spark internals, SQL & PySparkcoding rounds, DSA patterns for data roles, data modeling design questions, Airflow & orchestration rounds 📐 System Design: How to structure a complete data engineering design answer, Medallion architecture, streaming vs batch trade-offs, storage layer decisions, partitioning, idempotency 🗂️ Data Modeling: Star schema, Data Vault 2.0, SCD Types, fact & dimension design, real-world modeling scenarios 💼 Career Strategy: What to study, in what order, how to position yourself for senior roles, resume review, LinkedIn & Topmate profile feedback. 📝 Content & Profile Review: Making your experience read the way it deserves to. I don't give you a reading list. I give you a structured roadmap based on where you are right now and where you want to go — whether that's cracking your first data engineering role or landing a senior position at a top company. 📖 Read my work: medium.com/@vishalbarvaliya