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 👁️ 14 views 👏 0 claps ⭐ Featured

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

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 👁️ 8 views 👏 0 claps ⭐ Featured

SQL for Financial Transaction Analysis: Fraud Detection with Recursive CTEs

Kashinath Chavan • Data Structures & Algorithms • Aug 19

Java Multi-Threading & Concurrency Deep Dive: Thread Lifecycle & Synchronization

Master Java concurrency: Thread states, Runnable vs Callable, synchronized blocks, volatile keywords, deadlock prevention, and ExecutorService thread pools.

⏱️ 2 min read 👁️ 298 views 👏 66 claps

Java Multi-Threading & Concurrency Deep Dive: Thread Lifecycle & Synchronization

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 • Data Structures & Algorithms • Aug 18

Java Collections Framework Mastery: ArrayList, HashMap & Queue Implementations

Under the hood of the Java Collections Framework: HashMap collision handling with red-black trees, ArrayList dynamic capacity doubling, and ConcurrentHashMap locks.

⏱️ 2 min read 👁️ 334 views 👏 74 claps

Java Collections Framework Mastery: ArrayList, HashMap & Queue Implementations

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 👁️ 371 views 👏 82 claps

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

Kashinath Chavan • Interview Prep & Database • Aug 16

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 • Database & SQL • Aug 16

PostgreSQL Query Optimization: Understanding B-Tree Indexes, EXPLAIN ANALYZE & Buffer Hits

Demystify query performance in PostgreSQL. Learn how sequential scans, index scans, bitmap heap scans, and memory work behind every high-speed SQL query.

⏱️ 1 min read 👁️ 259 views 👏 64 claps

PostgreSQL Query Optimization: Understanding B-Tree Indexes, EXPLAIN ANALYZE & Buffer Hits

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.