Backend tech guide and AI engineering practice covering fundamentals, databases, distributed systems, high concurrency, system design, plus AI agents and large-model engineering.
The article compares DeepSeek V4 and GLM‑5.1 AI coding models by analyzing their pricing structures, cache‑hit mechanisms, real‑world billing data, and suitability for different coding workloads, ultimately offering guidance on when each model provides the most cost‑effective solution.
DeepSeek V4’s pricing fell 75% overnight, making the V4‑Pro and V4‑Flash models dramatically cheaper than competing AI services; the article details the new rates, compares them with other providers, shows two Claude Code case studies consuming nearly 4 million tokens, and explains how domestic Ascend 950 hardware enables the discount.
This article introduces CC GUI, an open‑source JetBrains plugin that adds a visual workspace for Claude Code and OpenAI Codex, walks through installation, configuration, and usage steps, compares it with the Qoder plugin, and shows how to automate code reviews inside IDEA.
The article analyzes the rise of AI‑driven CLI tools like Claude Code versus traditional AI‑enhanced IDEs, compares their workflows, strengths, and limitations, and explains how mixed usage and emerging trends are reshaping the future of AI‑assisted software development.
The article explains how industrial‑grade AI agents require structured prompt engineering, chain‑of‑thought reasoning, task decomposition, and a three‑layer defense (sandbox, prompt isolation, and human approval) to prevent prompt‑injection attacks, while also covering context engineering, retrieval‑augmented generation, and tool design best practices.
The article walks through the evolution of sensitive‑word filtering—from naïve brute‑force scanning to Trie, Aho‑Corasick automaton, Double‑Array Trie, and DFA implementations—detailing their algorithms, time/space complexities, concrete Java code examples, performance trade‑offs, high‑concurrency optimizations, and practical production advice for building a robust content‑moderation system.
The article explains the built‑in Claude Code /simplify command, how it uses three parallel AI agents to review and automatically fix code, demonstrates real‑world bugs it uncovered in Java projects, compares it with traditional linters, and offers practical tips and integration guidance.
This article explores the Learn Claude Code website, breaking down the universal agent loop into twelve incremental versions, demonstrating language‑agnostic implementations in Python and Java, and detailing progressive capabilities—from basic tool integration to memory compression, concurrency, and multi‑agent collaboration.
This article demonstrates how the Qoder AI plugin for JetBrains IDEA can transform lengthy backend tasks—such as deep‑pagination optimization and legacy code refactoring—into rapid, automated workflows, cutting development time from days to under ten minutes while preserving code quality.
While many believe that using SELECT * inevitably disables indexes, MySQL’s optimizer only skips indexes when a full table scan is cheaper, and patterns such as violating the left‑most prefix, applying functions or implicit casts, leading‑wildcard LIKE, OR/IN misuse, and mismatched ORDER BY can cause index invalidation, prompting some companies to forbid SELECT * in production.
