Engineering Blog | Vatsal Verma

Engineering BlogGuides on Spring Boot, Elasticsearch, JVM internals, SOLID, design patterns, and JVM AI agents.

My “I’ll Come Back to This” Collection - Papers, articles, and anything else worth saving, a living list of things I keep coming back to.

Spring Boot Ultra: Main Character Energy for Your Backend - The ultra Spring Boot textbook - Parts I–XXI with deep lessons, matrices, mermaid diagrams, labs, architect chapters (starters, Actuator, security, GraphQL, SSL, JdbcClient, CRaC), plus a 972-topic atlas with official docs links.

It's Lucene All the Way Down - A proper Elasticsearch course - teach Lucene guts, search, analytics, lifecycle, vectors, and ops with worked examples and official elastic.co docs links on every topic. Not a flashcard deck.

Know the JVM, My Brother. Offers Follow. - A thousand Q&As on JVM guts - memory, GC, concurrency, proxies, classloading - and the basics that still break production. Built for revision, not fluff.

ArwenForge: Profile-Based RBAC for Multi-Agent MCP Servers - One MCP endpoint, many agents. ArwenForge tags tools, resources, prompts, and delegates with profiles — then enforces least-privilege discovery and fail-closed execution on the JVM.

docube-db: Zero-Infra Code Lookup via Prefix Pruning - A small Java library that finds the right invoice, serial, or part code when the input is almost right using a chunk trie to prune and Levenshtein to rank. Open source on GitHub.

State It. Cache It. Ace It. A Dynamic Programming Guide. - A 7-day roadmap from recursion and memoization through knapsack, tree DP, bitmask DP, and interval DP - with curated LeetCode problems and contest-ready patterns.

Everything you need to know about LangChain and LangGraph - This post takes you from "what is an LLM API?" to production agents - step by step, no prior knowledge assumed.

One Change Breaks Everything? Five SOLID Principles Fix That - A deep-dive into all five SOLID principles with real-world analogies, bad vs. good code comparisons, and complete Java examples. Learn how to write clean, maintainable, and extensible software that your future self will thank you for.

Design Patterns Hiding in Your Code - All of Them, Explained - A deep-dive into all 23 GoF design patterns - Creational, Structural, and Behavioral, explained with real-world analogies, UML intent, and complete Java code examples. Your one-stop reference for writing better, scalable software.

Embabel Agent Framework: Build Smarter AI Agents on the JVM - A deep-dive into Embabel - the JVM-native agent framework that replaces brittle workflows with type-driven, goal-oriented AI planning. Learn the core concepts, write your first agent, and understand why it's a step ahead of LangGraph, CrewAI, and similar tools.

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