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Youzan Coder

Official Youzan tech channel, delivering technical insights and occasional daily updates from the Youzan tech team.

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Latest from Youzan Coder

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Youzan Coder

Apr 30, 2021 · Backend Development

Uncovering Hidden Flaws in a Distributed Lock Implementation: A Structured Code Review

This article examines the business context and collection workflow of a BOS‑integrated service, dissects the distributed lock logic and its execution sequence, and conducts a thorough structured code review that reveals logical, exception, non‑functional, and testability issues while offering concrete improvement recommendations.

Distributed LockJavaMonitoring

0 likes · 8 min read

Uncovering Hidden Flaws in a Distributed Lock Implementation: A Structured Code Review

Youzan Coder

Apr 28, 2021 · Operations

YouZan Low-Code Platform BOS: Testing Strategy and Implementation Guide

The guide explains YouZan’s low‑code BOS platform, its component‑based architecture, and a multi‑level testing methodology—including automated component, product, and workflow tests, traffic replay, performance checks, and a robust fallback mechanism—to ensure seamless migration and reliable operation of digitized business processes.

BOSLow‑code platformYouzan

0 likes · 9 min read

YouZan Low-Code Platform BOS: Testing Strategy and Implementation Guide

Youzan Coder

Apr 23, 2021 · Operations

How to Build a Generic API Robustness Scanning System for Automated Test Case Generation

This article presents a comprehensive, automated solution for API robustness testing that extracts baseline cases, generates exhaustive parameter‑level test data, executes them at scale, and analyzes results to identify abnormal responses without manual effort, thereby improving testing efficiency and software quality.

API testingcase generationoperations

0 likes · 13 min read

How to Build a Generic API Robustness Scanning System for Automated Test Case Generation

Youzan Coder

Apr 7, 2021 · Mobile Development

Design and Implementation of a Mobile App Performance Monitoring System

The article describes a two‑part mobile app performance monitoring system that automatically instruments code to capture method execution times, ANR and frame stalls, then processes, cleans, aggregates, and visualizes the data on a backend platform to generate alerts, trend reports, and guide optimization across versions.

APMOptimizationPerformance Monitoring

0 likes · 11 min read

Design and Implementation of a Mobile App Performance Monitoring System

Youzan Coder

Apr 2, 2021 · Interview Experience

Inside Youzan's Testing Team: Structure, Practices, and Culture

This article introduces Youzan's testing team, detailing its growth to over 120 engineers across three cities, the test‑development responsibilities, automation and load‑testing practices, quality‑assurance framework, training programs, and the open, growth‑focused team culture that candidates can expect.

AutomationTeam CultureTesting

0 likes · 8 min read

Inside Youzan's Testing Team: Structure, Practices, and Culture

Youzan Coder

Mar 31, 2021 · Frontend Development

Boost UI Test Stability: Practical Puppeteer & Mocha Strategies

This article shares a year‑long experience of UI automation at Youzan, covering how to select stable business scenarios, choose Puppeteer with Mocha, implement robust element locating, handle dynamic data via API interception, apply wait and retry mechanisms, capture screenshots, log responses, and integrate tests into CI pipelines for reliable regression testing.

API interceptionCI integrationPuppeteer

0 likes · 13 min read

Boost UI Test Stability: Practical Puppeteer & Mocha Strategies

Youzan Coder

Mar 26, 2021 · Mobile Development

Dynamic Domain Name Implementation in Mobile Apps

The article explains how to implement dynamic domain name switching in mobile apps across iOS, Android, Flutter, and H5 by using a configuration center and native network interception techniques such as NSURLProtocol, OkHttp instrumentation, texture bridging, and frontend configuration to resolve regional DNS issues and enable extended features like request statistics and custom responses.

AndroidCross‑platformDynamic Domain

0 likes · 10 min read

Dynamic Domain Name Implementation in Mobile Apps

Youzan Coder

Mar 12, 2021 · Information Security

How Youzan Re‑engineered Its Permission System for Scalable Access Control

This article examines the evolution of Youzan's permission management—from the original SAM system using a 64‑bit RBAC model to the flexible 2.0 architecture with rig, dynamic menu, and widget delegation—highlighting design choices, implementation details, challenges solved, and measurable business impact.

Permission ManagementRBACSystem Architecture

0 likes · 15 min read

How Youzan Re‑engineered Its Permission System for Scalable Access Control

Youzan Coder

Feb 26, 2021 · Big Data

Migrating Spark Offline Computing to Kubernetes: Architecture, Optimizations, and Lessons Learned

Youzan migrated its large‑scale offline Spark workloads from YARN to a cloud‑native Kubernetes architecture, separating storage and compute with Ceph FS, adding dynamic executor allocation and remote shuffle services, and applying numerous Spark and deployment tweaks that yielded elastic scaling, higher resource utilization, reduced costs, and valuable operational lessons.

DevOpsKubernetesPerformance optimization

0 likes · 24 min read

Migrating Spark Offline Computing to Kubernetes: Architecture, Optimizations, and Lessons Learned

Youzan Coder

Feb 24, 2021 · Mobile Development

Building Offline Mobile Performance Monitoring with AWACS and APM

This article explains how Youzan extended its APM framework with offline monitoring, built the AWACS visual tool, integrated Appium‑driven regression, instrumented method timing and network traffic via Gradle plugins, captured page rendering time, processed data in the backend, and created an issue‑management platform, outlining future enhancements.

APMAndroidPerformance Monitoring

0 likes · 13 min read

Building Offline Mobile Performance Monitoring with AWACS and APM