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Practical articles on Java, System Design, DSA, Spring Boot and databases — written by practitioners, with the interview angle built in.
27 articles · 510+ lessons · no account needed
DSA · 21 Sept 2026
Instead of memorising 500 LeetCode solutions, learn 14 patterns. Recognise the pattern and you can derive the solution from first principles.
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Latest articles
Long-form guides — no fluff, no clickbait.
JDK 27 went GA on 15 September 2026 with 9 JEPs. G1 everywhere, compact object headers, post-quantum TLS and JFR redaction change behaviour with zero code changes; lazy constants, primitive patterns, structured concurrency and the PEM API are previews. What each one means, with working Java examples.
29 Sept 2026
AI coding agents make you faster — until you start five tasks at once and lose track of all of them. A practical playbook for Java developers on using agent wait time well, reviewing AI-generated code properly, and staying sharp for interviews.
29 Sept 2026
A step-by-step system design for 1M requests/sec — capacity math with Little's Law, edge caching, load balancing, multi-level caching, consistent-hash sharding, async queues, rate limiting, circuit breakers and autoscaling, with Java examples and the mistakes most designs make.
29 Sept 2026
Qualcomm's Snapdragon 8 Elite Gen 6 brings a 2nm process, the first 5GHz mobile CPU, on-device agentic AI and new camera processing to flagship Android phones. Here's what's inside, what's Extreme-only, and what it means for your next phone.
26 Sept 2026
From April 1, 2027, smartphone screen protectors must meet the Indian Standard IS 19348:2025 under BIS compulsory registration. It isn't a ban — here's what actually changes for buyers, sellers and manufacturers.
26 Sept 2026
How B-tree indexes make queries fast, why column order matters in composite indexes, covering indexes, reading EXPLAIN, and the cases where adding an index makes things worse.
26 Sept 2026
Turn O(n²) substring and subarray problems into O(n). The fixed and variable sliding window templates in Java, with six worked interview problems.
26 Sept 2026
How Kafka topics, partitions and consumer groups actually work, why ordering is only per partition, and what at-least-once and exactly-once really mean for your Spring Boot services.
26 Sept 2026
The algorithms behind API rate limiting, their trade-offs, and how to build a distributed limiter with an atomic Redis Lua script — a classic system design interview question, solved end to end.
26 Sept 2026
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