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Machine coding Master

Ex-Apple, Ex-Amazon Engineer | LLD & Machine Coding interview prep | Full working Java implementations with concurrency | javalld.com

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Thread Confinement in Java: Master High-Performance Concurrency in LLD Interviews
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Thread Confinement in Java: Master High-Performance Concurrency in LLD Interviews

#java #concurrency #design #interview
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2 min read
Stop Guessing JVM Bugs: Connect Claude Code to Spring Boot via Local MCP Actuator Servers
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Stop Guessing JVM Bugs: Connect Claude Code to Spring Boot via Local MCP Actuator Servers

#java #productivity #ai #llm
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2 min read
Java & AI: What Developers Need to Know
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Java & AI: What Developers Need to Know

#java #programming #ai #tutorial
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2 min read
Stop Paying Full Price: Orchestrate Claude's 50% Off Batch API with Spring Batch and Virtual Threads
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Stop Paying Full Price: Orchestrate Claude's 50% Off Batch API with Spring Batch and Virtual Threads

#java #concurrency #ai #llm
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2 min read
Java & AI: What Developers Need to Know
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Java & AI: What Developers Need to Know

#java #programming #ai #tutorial
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2 min read
Mastering Java Concurrency LLD: Why You Need Semaphores for Rate Limiting
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Mastering Java Concurrency LLD: Why You Need Semaphores for Rate Limiting

#java #concurrency #interview #systemdesign
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2 min read
Java Concurrency LLD: Master ReentrantLock and Condition for Precise Thread Signaling
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Java Concurrency LLD: Master ReentrantLock and Condition for Precise Thread Signaling

#java #concurrency #interview #design
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2 min read
Taming LLM Tail Latency: Dynamic Request Hedging with Java's JEP 480 Structured Concurrency
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Taming LLM Tail Latency: Dynamic Request Hedging with Java's JEP 480 Structured Concurrency

#java #concurrency #systemdesign #llm
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2 min read
Java & AI: What Developers Need to Know
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Java & AI: What Developers Need to Know

#java #programming #ai #tutorial
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2 min read
Your Agent Loop Just Cost $1,000: Instrumenting Spring AI with OpenTelemetry GenAI Conventions
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Your Agent Loop Just Cost $1,000: Instrumenting Spring AI with OpenTelemetry GenAI Conventions

#java #ai #llm #systemdesign
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2 min read
Stop Over-Serializing gRPC: Zero-Copy Microservice-to-Sidecar IPC with Project Panama
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Stop Over-Serializing gRPC: Zero-Copy Microservice-to-Sidecar IPC with Project Panama

#java #systemdesign #concurrency #computerscience
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2 min read
Securing Spring AI Tool Calls: Stop Letting AI Agents Bypass Authorization with ScopedValue
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Securing Spring AI Tool Calls: Stop Letting AI Agents Bypass Authorization with ScopedValue

#java #ai #llm #concurrency
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2 min read
Java & AI: What Developers Need to Know
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Java & AI: What Developers Need to Know

#java #programming #ai #tutorial
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2 min read
Reactive is Dead: Build Low-Latency Voice Agents with OpenAI Realtime and JDK WebSockets
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Reactive is Dead: Build Low-Latency Voice Agents with OpenAI Realtime and JDK WebSockets

#java #concurrency #ai #llm
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2 min read
Java LLD: How to Design Git (Version Manager) in an Interview
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Java LLD: How to Design Git (Version Manager) in an Interview

#java #oop #systemdesign #interview
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2 min read
Java LLD: Designing Snakes and Ladders with O(1) Move Resolution
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Java LLD: Designing Snakes and Ladders with O(1) Move Resolution

#java #oop #design #interview
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2 min read
Java LLD: Design Tic-Tac-Toe with O(1) Win Detection
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Java LLD: Design Tic-Tac-Toe with O(1) Win Detection

#java #programming #computerscience #interview
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2 min read
Stop Guessing Your Cache Locality: Verify JEP 401 Value Class Flattening with JFR
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Stop Guessing Your Cache Locality: Verify JEP 401 Value Class Flattening with JFR

#java #programming #computerscience #concurrency
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2 min read
Stop Wasting LLM Budgets: High-Performance Semantic Caching with Spring AI and pgvector
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Stop Wasting LLM Budgets: High-Performance Semantic Caching with Spring AI and pgvector

#java #ai #llm #systemdesign
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2 min read
Stop Ignoring Monitor Contention: Debugging Virtual Thread Latency in the JEP 491 Post-Pinning Era
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Stop Ignoring Monitor Contention: Debugging Virtual Thread Latency in the JEP 491 Post-Pinning Era

#java #concurrency #computerscience #productivity
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2 min read
Stop Spatially Disoriented Traces: Mapping JEP 480 Structured Concurrency Topologies in OpenTelemetry
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Stop Spatially Disoriented Traces: Mapping JEP 480 Structured Concurrency Topologies in OpenTelemetry

#java #concurrency #systemdesign #programming
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2 min read
Stop Hiding the Chain of Thought: Stream Claude 4.5 Native Thinking Blocks with Spring AI and SSE
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Stop Hiding the Chain of Thought: Stream Claude 4.5 Native Thinking Blocks with Spring AI and SSE

#java #ai #llm #concurrency
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2 min read
Stop Fixing Broken Architecture: Auto-Enforce Package Boundaries with Cursor Composer and ArchUnit
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Stop Fixing Broken Architecture: Auto-Enforce Package Boundaries with Cursor Composer and ArchUnit

#java #productivity #systemdesign #ai
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2 min read
Stop Parsing Raw Stack Traces: Debugging Virtual Thread Deadlocks with JDK 26 JSON Thread Dumps
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Stop Parsing Raw Stack Traces: Debugging Virtual Thread Deadlocks with JDK 26 JSON Thread Dumps

#java #concurrency #systemdesign #productivity
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Stop Guessing Your Off-Heap Leaks: Debugging Project Panama Memory Arenas with JDK 26 JFR NMT Events
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Stop Guessing Your Off-Heap Leaks: Debugging Project Panama Memory Arenas with JDK 26 JFR NMT Events

#java #programming #concurrency #computerscience
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2 min read
Stop Parsing LLM Junk: Zero-Latency JSON with Claude Prefill, Spring AI, and Java 26 Records
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Stop Parsing LLM Junk: Zero-Latency JSON with Claude Prefill, Spring AI, and Java 26 Records

#java #ai #llm #systemdesign
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2 min read
Stop Correcting Your AI: Write a .cursorrules to Force JDK 26 Idioms and Kill Legacy Java Hallucinations
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Stop Correcting Your AI: Write a .cursorrules to Force JDK 26 Idioms and Kill Legacy Java Hallucinations

#java #ai #concurrency #productivity
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2 min read
Stop Syncing Elasticsearch: Native Hybrid Search with Spring AI and Pgvector sparsevec
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Stop Syncing Elasticsearch: Native Hybrid Search with Spring AI and Pgvector sparsevec

#java #ai #llm #systemdesign
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2 min read
Java & AI: What Developers Need to Know
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Java & AI: What Developers Need to Know

#java #programming #ai #tutorial
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2 min read
Stop Stuffing Context Windows: Dynamic Tool Pruning with Spring AI Vector Routing
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Stop Stuffing Context Windows: Dynamic Tool Pruning with Spring AI Vector Routing

#java #ai #llm #systemdesign
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2 min read
Java LLD: Amazon Locker Design with SmallestFit Allocation
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Java LLD: Amazon Locker Design with SmallestFit Allocation

#java #systemdesign #oop #interview
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2 min read
Java & AI: What Developers Need to Know
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Java & AI: What Developers Need to Know

#java #programming #ai #tutorial
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2 min read
Stop Leaking Trace Context: How to Migrate OpenTelemetry to JDK 26 Scoped Values
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Stop Leaking Trace Context: How to Migrate OpenTelemetry to JDK 26 Scoped Values

#java #concurrency #systemdesign #programming
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2 min read
Stop Blocking Virtual Threads: Building Asynchronous Human-in-the-Loop AI Agents with Spring AI
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Stop Blocking Virtual Threads: Building Asynchronous Human-in-the-Loop AI Agents with Spring AI

#java #ai #llm #concurrency
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2 min read
Java LLD: Designing a Robust Vehicle Rental System
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Java LLD: Designing a Robust Vehicle Rental System

#java #systemdesign #oop #interview
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2 min read
Java & AI: What Developers Need to Know
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Java & AI: What Developers Need to Know

#java #programming #ai #tutorial
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2 min read
Stop Burning Cash on Long-Context RAG: Ephemeral Prompt Caching with Spring AI and JTokkit
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Stop Burning Cash on Long-Context RAG: Ephemeral Prompt Caching with Spring AI and JTokkit

#java #ai #llm #systemdesign
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2 min read
JDK 26 Pitfalls: Why CPU-Bound Tasks are Killing Your Virtual Threads
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JDK 26 Pitfalls: Why CPU-Bound Tasks are Killing Your Virtual Threads

#java #concurrency #systemdesign #programming
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2 min read
Java LLD: Designing a Thread-Safe Parking Lot with Strategy Pattern
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Java LLD: Designing a Thread-Safe Parking Lot with Strategy Pattern

#java #systemdesign #oop #concurrency
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2 min read
Java & AI: What Developers Need to Know
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Java & AI: What Developers Need to Know

#java #programming #ai #tutorial
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2 min read
Why Your eBPF Profiler Lies to You About Java Virtual Threads
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Why Your eBPF Profiler Lies to You About Java Virtual Threads

#java #concurrency #systemdesign #computerscience
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2 min read
Java 26 Structured Concurrency: Stop Subclassing StructuredTaskScope and Use JEP 480 Joiners
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Java 26 Structured Concurrency: Stop Subclassing StructuredTaskScope and Use JEP 480 Joiners

#java #concurrency #design #programming
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2 min read
Stop Polling Your Outbox: Lightweight Event Streaming with Postgres LISTEN/NOTIFY and Java Virtual Threads
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Stop Polling Your Outbox: Lightweight Event Streaming with Postgres LISTEN/NOTIFY and Java Virtual Threads

#java #systemdesign #concurrency #design
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2 min read
Stop Spinning Up Separate Vector DBs: Multi-Tenant Spring AI with Pgvector Metadata Filtering
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Stop Spinning Up Separate Vector DBs: Multi-Tenant Spring AI with Pgvector Metadata Filtering

#java #ai #llm #systemdesign
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2 min read
The Death of Static Rate Limiters: Why Your Java Virtual Threads Need BBR-Style Adaptive Concurrency
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The Death of Static Rate Limiters: Why Your Java Virtual Threads Need BBR-Style Adaptive Concurrency

#java #concurrency #systemdesign #algorithms
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2 min read
Stop Letting AI Agents Break Your Database: Transactional Multi-Agent Workflows with Temporal and Spring AI
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Stop Letting AI Agents Break Your Database: Transactional Multi-Agent Workflows with Temporal and Spring AI

#java #systemdesign #ai #llm
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2 min read
Stop Using Raw Vector Search: Implement GraphRAG with Spring AI and Neo4j
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Stop Using Raw Vector Search: Implement GraphRAG with Spring AI and Neo4j

#java #systemdesign #ai #llm
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2 min read
Java & AI: What Developers Need to Know
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Java & AI: What Developers Need to Know

#java #programming #ai #tutorial
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2 min read
R2DBC is Dead: Why JEP 491 and Virtual Threads Made Synchronous JDBC the 2026 Performance King
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R2DBC is Dead: Why JEP 491 and Virtual Threads Made Synchronous JDBC the 2026 Performance King

#java #concurrency #systemdesign #programming
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2 min read
Java LLD: Mastering LRU and LFU Cache Design for Machine Coding
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Java LLD: Mastering LRU and LFU Cache Design for Machine Coding

#java #interview #design #systemdesign
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2 min read
Stop Logging Your Thoughts: Mapping Agentic Reasoning Traces to Custom JFR Events for Zero-Overhead Debugging
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Stop Logging Your Thoughts: Mapping Agentic Reasoning Traces to Custom JFR Events for Zero-Overhead Debugging

#java #ai #llm #systemdesign
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2 min read
Stop the Boxing Tax: High-Performance Stream Processing with JEP 455 Primitive Type Patterns
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Stop the Boxing Tax: High-Performance Stream Processing with JEP 455 Primitive Type Patterns

#java #programming #computerscience #concurrency
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2 min read
The 'Clean Room' Isolation Pattern: Using JEP 484 to Sandbox Agent-Generated Logic
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The 'Clean Room' Isolation Pattern: Using JEP 484 to Sandbox Agent-Generated Logic

#java #systemdesign #ai #computerscience
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2 min read
Stop Casting Your Events: Leveraging JEP 440 Nested Record Patterns for Type-Safe Multi-Agent Orchestration
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Stop Casting Your Events: Leveraging JEP 440 Nested Record Patterns for Type-Safe Multi-Agent Orchestration

#java #oop #systemdesign #ai
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2 min read
Stop Manual Record Rebuilding: Mastering JEP 468 Derived Record Creation for Functional State Evolution
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Stop Manual Record Rebuilding: Mastering JEP 468 Derived Record Creation for Functional State Evolution

#java #programming #oop #productivity
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2 min read
Killing Latency: Why Global Agentic State Requires JEP 401 Value Classes and CvRDTs
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Killing Latency: Why Global Agentic State Requires JEP 401 Value Classes and CvRDTs

#java #systemdesign #concurrency #ai
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2 min read
Cell-Based Architecture: The Only Way to Survive the 2026 Agentic Loop Explosion
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Cell-Based Architecture: The Only Way to Survive the 2026 Agentic Loop Explosion

#systemdesign #java #ai #concurrency
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2 min read
Stop Guessing Your RAG Quality: Automating Faithfulness Metrics with Spring AI and LLM-as-a-Judge
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Stop Guessing Your RAG Quality: Automating Faithfulness Metrics with Spring AI and LLM-as-a-Judge

#java #ai #llm #systemdesign
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Stop Wasting Tokens: High-Performance Local Re-ranking with Spring AI and JEP 489
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Stop Wasting Tokens: High-Performance Local Re-ranking with Spring AI and JEP 489

#java #ai #llm #concurrency
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2 min read
Stop Sequential Tooling: Mastering Claude 5 Stream-Ahead Intent with Java 26 Stream Gatherers
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Stop Sequential Tooling: Mastering Claude 5 Stream-Ahead Intent with Java 26 Stream Gatherers

#java #ai #concurrency #llm
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