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System Design · Kafka · Spark · Flink · Airflow · dbt
Setup guides, deep dives, cheatsheets, and interview Q&A for every major Big Data tool.
RAG · Agents · OpenAI · Claude · Gemini · Llama
Build production AI systems — RAG pipelines, agents, chatbots, fine-tuning, and model comparisons.
System Design · Kafka · Spark · SQL · AI/ML · Behavioral
Topic-wise Q&A banks, grilling sessions, and system design walkthroughs for Big Data and AI roles.
SQL · Kafka · Spark · System Design · Cloud · DSA
Quick-reference cards from every section — built to be opened mid-work, not read end-to-end.
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Step-by-step setup guides — copy, paste, run.
⭐ Featured
System Design: Real-Time Data Pipeline
Design a real-time data pipeline that ingests 1M events/second, processes them, and serves analytics — with architecture diagram and trade-off discussion.
Kafka Local Setup — From Zero to Running in 10 Minutes
Run Kafka locally using Docker Compose. Create topics, produce messages, consume them, and understand what's happening under the hood.
Spark Architecture — How it Actually Works
Driver, executors, DAG scheduler, shuffle — the complete mental model for how Spark executes a job and where things go wrong.
SQL Cheatsheet — Window Functions, Joins, Optimization
The most important SQL patterns for data engineers — window functions, CTEs, joins, aggregations, and query optimization.
Kafka Interview Questions — Top 50 with Answers
The 50 most asked Kafka interview questions with detailed answers — from basics to internals to production scenarios.
RAG Pipeline — Complete Production Guide
Build a production-ready RAG pipeline: chunking strategy, embedding models, vector DBs, retrieval, re-ranking, and generation.
🕐 Recently added
System Design: Real-Time Data Pipeline
Design a real-time data pipeline that ingests 1M events/second, processes them, and serves analytics — with architecture diagram and trade-off discussion.
Kafka Local Setup — From Zero to Running in 10 Minutes
Run Kafka locally using Docker Compose. Create topics, produce messages, consume them, and understand what's happening under the hood.
Spark Architecture — How it Actually Works
Driver, executors, DAG scheduler, shuffle — the complete mental model for how Spark executes a job and where things go wrong.
SQL Cheatsheet — Window Functions, Joins, Optimization
The most important SQL patterns for data engineers — window functions, CTEs, joins, aggregations, and query optimization.
Kafka Interview Questions — Top 50 with Answers
The 50 most asked Kafka interview questions with detailed answers — from basics to internals to production scenarios.
RAG Pipeline — Complete Production Guide
Build a production-ready RAG pipeline: chunking strategy, embedding models, vector DBs, retrieval, re-ranking, and generation.
Built in public, growing daily
Every guide, comparison, and cheatsheet is added as the industry evolves. No filler — just content that actually works in production.