Engineering Blog & Tech Deep Dives

Kashinath Chavan • Interview Prep & Database • Aug 22

SQL for Power Plant Performance Monitoring: Querying Time-Series Data with Window Functions

Monitoring power plant efficiency requires analyzing time-series data from sensors. Learn how to use window functions to calculate rolling averages, detect anomalies, and optimize query performance with large datasets.

⏱️ 3 min read 👁️ 15 views 👏 0 claps ⭐ Featured

SQL for Power Plant Performance Monitoring: Querying Time-Series Data with Window Functions

Kashinath Chavan • Interview Prep & Database • Aug 22

System Design Interview: Designing Twitter Feed, WhatsApp & YouTube Architecture

Step-by-step system design walkthroughs for FAANG interviews. Learn how to design scalable distributed systems for Twitter's news feed, WhatsApp's messaging, and YouTube's video pipeline with CAP theorem, consistent hashing, and sharding explained.

⏱️ 5 min read 👁️ 5214 views 👏 693 claps ⭐ Featured

System Design Interview: Designing Twitter Feed, WhatsApp & YouTube Architecture

Kashinath Chavan • Interview Prep & Database • Aug 20

SQL for Financial Transaction Analysis: Fraud Detection with Recursive CTEs

Detecting fraudulent transactions in real-time requires tracing complex money flow paths. Learn how recursive CTEs can trace transaction trees, find circular patterns, and flag suspicious activity.

⏱️ 3 min read 👁️ 9 views 👏 0 claps ⭐ Featured

SQL for Financial Transaction Analysis: Fraud Detection with Recursive CTEs

Kashinath Chavan • Interview Prep & Database • Aug 18

SQL for E-commerce Inventory: Flash Sales, Low Stock Alerts, & Stock Reconciliation

Running a flash sale requires real-time inventory tracking. Learn how to prevent overselling, reconcile stock across warehouses, and alert on low inventory with production-ready SQL queries.

⏱️ 3 min read 👁️ 6 views 👏 0 claps

SQL for E-commerce Inventory: Flash Sales, Low Stock Alerts, & Stock Reconciliation

Kashinath Chavan • Interview Prep & Database • Aug 17

Core Java & JVM Memory Architecture: Static, Final, Heap & Stack Models

Understand JVM internal runtime data areas: ClassLoader subsystem, Heap memory generations, Stack frames, Method Area, and exact Static vs Final behavior.

⏱️ 1 min read 👁️ 372 views 👏 82 claps

Core Java & JVM Memory Architecture: Static, Final, Heap & Stack Models

Kashinath Chavan • Interview Prep & Database • Aug 17

SQL for Healthcare Analytics: Patient Wait Times, Readmission Rates & HIPAA-Compliant Aggregations

Healthcare data analysis requires careful handling of PHI. Learn how to compute wait times, readmission rates, and resource utilization while maintaining privacy and compliance.

⏱️ 2 min read 👁️ 5 views 👏 0 claps

SQL for Healthcare Analytics: Patient Wait Times, Readmission Rates & HIPAA-Compliant Aggregations

Kashinath Chavan • Interview Prep & Database • Aug 14

SQL for Travel Booking: Finding Cheapest Multi-City Itineraries with Recursive Queries

Building a flight search engine requires finding optimal routes. Learn how to use recursive CTEs to explore city graphs, compute total prices, and find the cheapest multi-city itineraries.

⏱️ 3 min read 👁️ 6 views 👏 0 claps

SQL for Travel Booking: Finding Cheapest Multi-City Itineraries with Recursive Queries

Kashinath Chavan • Interview Prep & Database • Aug 12

SQL for Product Analytics: Funnel Conversion, Drop-off Points & A/B Testing Comparisons

Understanding user funnel drop-off is key to product optimization. Learn how to compute conversion rates at each step, identify where users disappear, and compare A/B test variants with SQL.

⏱️ 3 min read 👁️ 5 views 👏 0 claps

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