System Design

Data engineering system design interview rounds — 10 real-world scenarios with AWS, Azure & GCP implementations

Clickstream Data Pipeline

Clickstream Data Pipeline

Real-time clickstream capture for targeted ads (Netflix-style)

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Price Drop Notification System

Price Drop Notification System

E-commerce price monitoring & notification effectiveness measurement

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Fitness Tracker Data Platform

Fitness Tracker Data Platform

IoT health data ingestion, modeling and analytics

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Ride-Sharing Analytics Platform

Ride-Sharing Analytics Platform

Geospatial data storage, surge pricing and KPI analysis

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1M Req/Sec Pipeline to Warehouse

1M Req/Sec Pipeline to Warehouse

Extreme-scale ingestion, backpressure handling and warehouse loading

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User Churn Prediction Pipeline

User Churn Prediction Pipeline

Churn calculation, feature engineering and ML pipeline

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Real-Time Fraud Detection

Real-Time Fraud Detection

Low-latency payment fraud scoring with rule engine + ML

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Streaming Recommendation Engine

Streaming Recommendation Engine

Music/video personalization with collaborative filtering

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Incremental Lakehouse Architecture

Incremental Lakehouse Architecture

Legacy files + streaming + CDC into unified lakehouse

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CDC Pipeline for Data Lake

CDC Pipeline for Data Lake

Database change capture, schema evolution and replication

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Batch Reconciliation System

Batch Reconciliation System

Multi-source transaction reconciliation, idempotency, partial upstream failures

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Nightly ETL & Data Warehouse Pipeline

Nightly ETL & Data Warehouse Pipeline

SCD Type 2, incremental loads, DAG dependency ordering, late-arriving data, DQ gates

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Customer 360 & Identity Resolution

Customer 360 & Identity Resolution

Entity resolution, golden record, PII tokenization, GDPR erasure across 6 source systems

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Large-Scale Historical Backfill

Large-Scale Historical Backfill

Resumable 15TB backfill, partition checkpointing, live pipeline isolation, rollback strategy

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Financial Month-End Close Pipeline

Financial Month-End Close Pipeline

Intercompany elimination, multi-currency FX conversion, SOX audit trail, 47-country consolidation

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