The article examines common pitfalls of naïve ad insertion in short‑video feeds, explains how cursor‑based pagination prevents duplicate ads, and outlines a client‑side mixing architecture that isolates services, meets strict latency requirements, and ensures accurate ad billing.
The article dissects Claude Code’s task architecture, explaining the 7‑type TaskType union, the 9‑character prefixed ID scheme, the TaskStatus state machine, guard functions, incremental output handling, a minimal kill‑only interface, and a stall‑watchdog that together make concurrent Agent debugging both readable and secure.
This article provides a detailed technical walkthrough of a typical payment platform architecture, covering the overall system overview, core transaction and payment modules, service governance mechanisms such as unified context and data consistency, and practical production practices like performance testing and asynchronous processing.
This article explains how to design and implement a WeChat group red packet feature, covering database schema, non‑cached and cached workflows, concurrency control with Redis locks, and two allocation algorithms—random distribution and double‑average method.
This article breaks down the essential requirements and architecture of a high‑performance like system, covering fast response, data consistency, scalability under traffic spikes, and cost‑efficient resource use, while detailing the technical stack, caching strategies, async persistence, and practical optimizations.
This article explains the concept of API idempotency, when it should be applied, practical design patterns—including database checks, unique transaction IDs, and Snowflake ID generation—and the core principles for balancing reliability and cost in backend services.
Learn how to design and implement automatic order expiration in e‑commerce systems using three approaches—simple scheduled table scans, delayed message queues, and a Redis time‑wheel—detailing their trade‑offs, code examples, indexing tips, distributed locking, and failure‑handling strategies.
After analyzing thousands of Chinese projects, the article reveals seven pervasive architecture design pitfalls—overreliance on frameworks, chasing trends, neglecting domain modeling, ignoring evolution, overlooking non‑functional requirements, lacking team standards, and weak testing—offering practical guidance to adopt business‑driven, scalable, maintainable designs.
This article explains how to prevent duplicate orders in a high‑traffic system handling 100,000 QPS by combining frontend safeguards such as button disabling and token mechanisms with backend techniques including NGINX rate limiting, gateway token validation, idempotent database design, sharding, distributed locks, optimistic locking, and comprehensive logging and monitoring.
This article provides a comprehensive technical deep‑dive into a modular transaction system for large‑scale membership services, covering its architecture, core workflow, component design, configuration details, order and signing services, product handling, settlement process, and stability mechanisms.
The article explains the TCP three‑way handshake, why the third ACK is essential, how servers react when it is missing, the role of timeout retransmission and RTO calculation, the impact of SYN‑Flood attacks, and how these concepts inspire backend design patterns.
This guide shows how product managers can redesign a chaotic e‑commerce admin panel by applying a four‑step information‑architecture process—role analysis, navigation hierarchy, global search, and feedback—to boost efficiency, reduce errors, and create a seamless user experience.
Improving software architecture efficiency requires stable, orthogonal module design, performance‑focused refactoring that avoids tactical shortcuts, and disciplined layered code that balances business and domain responsibilities, while fostering modularization, decoupling, strict quality standards, and a collaborative culture of continuous improvement.
This article presents a detailed case study of four backend design alternatives for importing Excel data—ranging from synchronous processing to asynchronous pipelines with thread pools, message queues, and Redis locks—analyzing their advantages, drawbacks, and suitable scenarios.
This article examines the trade‑offs between simple and detailed events in event‑driven architectures, illustrating their impact on scalability, coupling, and system design through concrete examples, design guidelines, and considerations from domain‑driven design to practical implementation.
This article outlines an architect's thinking model, a step‑by‑step requirement analysis, core design principles for a risk engine—including efficient rule composition, operational support, unified SDK integration, and an event ingestion center—and presents business, application, data, and technical architecture diagrams to illustrate the complete system.
The article proposes a high‑performance, strictly incremental distributed ID generation scheme that combines MySQL segment tables, Redis caching, and Nacos‑controlled switching, achieving sub‑millisecond latency and 7‑10× speedup over pure database methods while preserving fault tolerance, availability, and global uniqueness.
The article recounts how a fast‑growing event‑processing platform initially embraced microservices, then faced queue bottlenecks, test‑suite overload, and operational complexity, leading the team to consolidate over 140 services into a single, shared‑queue architecture, and shares the practical insights and trade‑offs learned from this transition.
This article outlines a conceptual model for complex payment and refund scenarios, detailing payment methods, channels, platforms, various payment types, refund options, and key design considerations such as multiple payment details, merged payments, distributed locks, and state consistency.
This article walks through the complete shopping‑cart‑to‑order workflow of the open‑source Mall project—built with SpringBoot, Vue and uni‑app—detailing database schema, cart promotion logic, confirm‑order generation, order creation, cancellation, and payment‑success callbacks, while highlighting key design considerations and code references.
This article explores how to build a highly flexible and reliable retail product system by applying domain‑driven design, decomposing complex business logic into reusable components, orchestrating them, and employing a layered DDD architecture to handle diverse B2B and B2C requirements.
The article analyzes the root causes and system‑wide consequences of oversized messages in JD Logistics, explains middleware limits of JMQ and JSF, and presents design principles, code‑level checks, and practical mitigation techniques such as pagination, claim‑check pattern, batch sizing, and monitoring to prevent service outages.
This article walks through the historical evolution of backend architecture—from early N‑layered designs, through DDD, Hexagonal, Onion, and finally Clean Architecture—explaining why each style emerged, how they differ, and what practical rules developers can follow to manage complexity and dependencies.
This article explores the principles of engineering architecture design, emphasizing value‑first decision making, discusses common pitfalls, outlines layered and domain‑driven design patterns, compares MVC and hexagonal architectures, and provides practical guidance on technology selection, risk assessment, and operational best practices for building maintainable, scalable backend systems.
This article examines why data consistency between microservices is critical, defines key terminology, and presents two practical approaches—business‑side final consistency and platform‑side final consistency—detailing their core ideas, design principles, workflow diagrams, and real‑world implementation considerations such as idempotency, storage choices, latency tolerance, state‑machine design, concurrency control, and observability.
The article explains simple yet essential principles for deciding service orchestration order, illustrates them with a cost‑based example of four independent services, and reflects on the deeper need to understand underlying business and technical rules rather than just project details.
This article systematically explores the challenges of microservice service splitting—from technical choices and architectural reliability to business model validation and team collaboration—offering static and dynamic solutions, design principles, and practical guidelines for effective service decomposition.
This article details the end‑to‑end design of a coupon system for a rental listing platform, covering business flow, MySQL table schemas, activity lifecycle management, state‑machine and observer patterns, high‑concurrency claim handling with Redis and MQ, and future scalability optimizations.
This article details the design and implementation of a coupon system for a rental platform, covering business flow, database schema, backend services, caching strategies, state management, and future optimization directions to ensure reliable coupon distribution and redemption.
This article examines the role of order systems in traditional e‑commerce enterprises, outlines their essential functional modules and design principles, explores upstream and downstream relationships, details core processes such as order creation, payment, fulfillment, and returns, and discusses future architectural evolution.
This article examines the role of order systems in traditional e‑commerce enterprises, outlines their core functional modules, maps upstream and downstream relationships, details the end‑to‑end order lifecycle—including creation, payment, fulfillment, confirmation, completion and reverse processes—and discusses future architectural trends and challenges.
This article explains how to design and implement reliable scheduled tasks in multi‑instance Java applications, covering task types, clustering solutions like Quartz, lock strategies, version‑based data consistency, and key operational considerations such as intervals, priorities, and monitoring.
This article explains the end‑to‑end design of a coupon system for e‑commerce, covering promotion types, core workflows, service architecture, database schema, distributed transaction handling, scaling strategies, rate limiting, and consistency mechanisms such as TCC.
The article analyzes the memory inefficiency of storing per‑user read/unread lists for group chat messages, proposes a bitmap‑based solution with user‑to‑map ID mapping, discusses handling of member exits, and evaluates the storage savings and scalability of the new design.
This article describes how a high‑throughput push notification system was enhanced with a dedicated testability metric, introducing tools such as a test‑sending UI, dual synchronous‑asynchronous API handling, a reachability diagnostic utility, and end‑to‑end unique‑ID logging to streamline debugging and reduce maintenance costs.
This article explains the key concepts, simple design, practical steps, and multiple solution patterns—including front‑end scaling, cache‑based concurrency control, and database handling—used to build a reliable high‑traffic flash‑sale system.
Event‑driven architecture (EDA) coordinates micro‑services through immutable events and a reliable broker, enabling decoupling, asynchronous processing, and state‑change tracking via patterns such as event notification, state transfer, event sourcing, and CQRS, while offering scalability and robustness but demanding careful design to avoid complexity and consistency issues.
This article examines how to model read/unread status for group chat messages using bitmap techniques, evaluates memory costs of naive approaches, and presents a compact storage schema that handles member joins, exits, and scalability while drastically reducing per‑message overhead.
This article examines the core challenges of flash‑sale (秒杀) systems—such as overselling, extreme concurrency, bot traffic, and database strain—and presents a comprehensive backend design that includes dedicated databases, dynamic URLs, static pages, Redis clustering, Nginx load balancing, SQL optimization, rate‑limiting, asynchronous order queues, and service degradation strategies.
This article introduces three widely used system architecture designs—single‑database single‑application, content distribution with CDN/OSS, and read‑write separation with master‑slave databases and Elasticsearch—detailing their structures, advantages, disadvantages, and typical usage scenarios.
This article examines common system architecture patterns—microservices, multi‑level caching, and database sharding—explaining the problems they address, how they work, their advantages and drawbacks, and practical guidance for applying them without over‑engineering.
The article explains the master‑sub order model used in e‑commerce, defines master orders as collections of sub‑orders and sub‑orders as single‑SKU transactions, evaluates design options for goods, services, and fees, reviews the current “得物” single‑SKU system, and proposes a scalable multi‑sub‑order, multi‑master‑order architecture to support combined payments, multi‑warehouse fulfillment, and complex purchase scenarios.
The article explains the high‑traffic flash‑sale scenario, analyzes synchronization, bot‑prevention, and server‑capacity challenges, and presents distributed architectural solutions such as CDN edge services, rate‑limiting, load‑balancing, and caching to reliably handle millions of concurrent requests.
This article explains how Wix engineers built a robust, event‑driven messaging infrastructure on Kafka that serves over 1,400 microservices, detailing six key patterns—including consumption‑projection, end‑to‑end event flows, in‑memory KV stores, scheduling, transactional events, and aggregation—that improve scalability, resilience, and operational simplicity.
The article discusses common pitfalls in application layering, presents Alibaba's clear multi‑layer architecture—including Open Interface, Terminal Display, Web, Service, Manager, and DAO layers—offers an optimized layering model with Thrift, explains domain model conversions, and provides practical recommendations for maintainable backend design.
This article explains how to design a flash‑sale (秒杀) system that can handle massive traffic spikes by using static page CDN caching, gateway request interception, Redis inventory control, asynchronous order processing, and thorough business, deployment, and data isolation to ensure high performance and stability without affecting regular services.
This article outlines the essential role of order systems in traditional e‑commerce enterprises, detailing their responsibilities, core functional modules, relationships with upstream and downstream services, workflow processes, state management, and future development considerations to guide robust system design.
This article explains the essential concepts, functional architecture, and detailed design of an e‑commerce product center, covering SPU/SKU definitions, front‑ and back‑end categories, attribute types, CRUD operations, and specific features such as product publishing, review, unpublishing, editing, and category management.
This article examines the essential role of order systems in traditional e‑commerce enterprises, outlines their core functional modules and architectural design, explores relationships with upstream and downstream services, details key processes such as order creation, payment, fulfillment, and discusses future development directions and scalability challenges.
This article explains the role of an order system in traditional e‑commerce enterprises, outlines its main functional modules and design thinking, describes its upstream and downstream relationships, details core features, process engine, state machine, and discusses future architectural evolution.
This article examines the challenges of message loss in live‑streamed online classrooms, analyzes why pushes can fail, and proposes a comprehensive reliability strategy—including TCP fundamentals, multi‑channel redundancy, sequence‑based ordering, hole‑pulling, and configurable back‑end mechanisms—to achieve near‑100% delivery.
This article examines how evolving software requirements can lock systems into rigid data models, explains the Command Query Responsibility Segregation (CQRS) pattern, and outlines when CQRS is beneficial or detrimental, helping architects decide if separating read and write models will improve scalability and maintainability.
This article explains how to apply layered architecture and Domain‑Driven Design (DDD) to a Java‑based fresh‑food e‑commerce microservice system, outlining a five‑layer stack, domain partitioning, practical guidelines, and common pitfalls to help teams build maintainable, scalable back‑ends.
The article explains a three‑component backend architecture—microservices, message queues, and scheduled tasks—detailing their design principles, service layering, job handling, and practical deployment considerations to build extensible, reliable internet projects.
This article explains how the creator red‑packet feature was engineered to guarantee idempotent, fault‑tolerant, and high‑throughput red‑packet claims by using multi‑level caching, empty placeholders, binlog‑driven synchronization, active cache invalidation, ordered Kafka consumption, and fallback strategies to resolve cache‑DB consistency issues.
This article analyzes the role, core modules, upstream/downstream relationships, business architecture, process engine, state machine, and future development trends of order systems in traditional e‑commerce enterprises, offering a comprehensive guide for designing scalable and maintainable order platforms.
This article examines the role of order systems in traditional e‑commerce, outlines their core modules and architecture, explains upstream/downstream relationships, details workflow and state‑machine design, and discusses future development directions for building robust, maintainable order platforms.
The article examines how to reduce tight coupling between microservices by applying module‑division principles, converting synchronous calls to asynchronous messaging, leveraging event‑driven architectures and CQRS, employing local caching and data landing, and refactoring overly coupled services for more resilient backend systems.
This article examines the challenges of building a flash‑sale (秒杀) system—such as overselling, massive concurrent requests, URL exposure, and database bottlenecks—and presents a comprehensive backend architecture that combines separate databases, dynamic URLs, static pages, Redis clustering, Nginx load balancing, SQL optimization, rate‑limiting, asynchronous order processing, and service degradation techniques.
This article examines the challenges of building a flash‑sale (秒杀) system—such as overselling, high concurrency, request flooding, URL security, and database strain—and presents a comprehensive backend design using separate databases, Redis clustering, dynamic URLs, static pages, Nginx, rate‑limiting, asynchronous order processing, and service degradation strategies.
The article explains why short URLs are widely used in spam messages, outlines the basic workflow of a URL shortening service, and discusses practical backend design choices such as ID generation, database storage, caching, batch allocation, and distributed architectures to achieve high concurrency and reliable one‑to‑one mapping.
This article presents a practical approach to applying layered architecture and Domain‑Driven Design (DDD) to a Java‑based fresh‑food e‑commerce microservice system, outlining five layers, their responsibilities, design principles, domain partitioning tips, and common pitfalls to help engineers build maintainable, scalable back‑ends.
This article examines the challenges of building a flash‑sale (秒杀) system—such as overselling, high concurrency, request throttling, and database strain—and presents a comprehensive backend design using separate databases, dynamic URLs, static pages, Redis clustering, Nginx, token‑bucket rate limiting, asynchronous order processing, and service degradation strategies.
This article explains the principles, types, and layer responsibilities of DDD layered architecture, compares it with traditional four‑layer and three‑layer designs, and shows how microservices can evolve by reorganizing aggregates and applying dependency inversion across UI, application, domain, and infrastructure layers.
The article describes a mobile configuration center that lets native apps dynamically modify display logic and roll out features via gray‑release, supporting version‑specific delivery, rollback, and environment isolation, and details its evolution from a simple V1 design to an extensible V2 architecture with per‑KV control and caching.
The article details Ctrip's challenges with multiple AB testing splitters, presents performance gains after migrating to a new splitter, and explains the comprehensive redesign covering overall architecture, interface consolidation, SDK slimming, and a custom distributed cache backend to achieve higher throughput and lower latency.
The article presents a flexible fatigue‑control mechanism for Omega’s real‑time user‑reach system that replaces fixed windows with dynamic, user‑scene‑business dimensions and a minimum interval, eliminating duplicate daily messages, dispersing delivery times, maintaining stable 6000‑QPS performance, and paving the way for reusable components and recommendation integration.
This article examines the challenges of building a robust flash‑sale (秒杀) system—such as overselling, high concurrency, request throttling, and database design—and presents a comprehensive backend architecture using Redis clusters, Nginx, token‑bucket rate limiting, asynchronous order processing, and other optimization techniques.
This article explains the fundamentals and architecture of feed‑stream systems—defining feed data, outlining storage choices such as distributed NoSQL or MySQL, comparing push, pull, and hybrid synchronization models, handling metadata, search, ordering, and scaling considerations for billion‑user platforms.
This article explains the stringent reliability requirements of instant messaging—ordered delivery, low latency, no loss, and deduplication—analyzes causes of disorder such as multi‑process and multi‑thread architectures, and presents practical solutions including hash‑based routing, sequential IDs, push‑pull mechanisms, ACK optimization, and distributed ID generation.
This article examines the challenges of traditional retail accounting, introduces the concept of a financial middle platform, outlines its business and application architecture using the C4 model, and provides practical guidance for evolving the design into a micro‑service ecosystem while balancing complexity and performance.
This article presents thirty practical architecture principles—from keeping designs simple and avoiding unnecessary features to embracing automated testing, ROI, user‑centric decisions, and distributed system fundamentals—offering a comprehensive guide for backend developers to build scalable, maintainable, and user‑friendly software.
This article details how MaFengWo’s payment center evolved from a simple 1.0 implementation to a robust 2.0 architecture, covering core capabilities, modular design, monitoring, and the operational lessons learned for building a high‑availability, scalable payment platform.
The article explains how to build a flexible, extensible internet project architecture by combining micro‑services, message‑queue communication, and scheduled jobs, detailing service layering, responsibilities, data isolation, reliability concerns, and practical deployment considerations for large‑scale backend systems.
The article explains service isolation in system architecture, its origins, why it matters, two main isolation approaches (by service and by user), their advantages and drawbacks, and key considerations to ensure fault containment and improve overall system availability.
This article chronicles the rapid growth of ZhaiZhai's second‑hand trading platform and explains how its transaction core was refactored from a single‑service monolith into a unified, configurable, FSM‑driven architecture that isolates business lines, abstracts common logic, and improves scalability and maintainability.
This article shares a comprehensive approach to improving the experience of backend admin systems, covering why experience matters, measurement methods such as satisfaction surveys and user‑experience maps, and practical design solutions like homepage redesign, notification tiering, complex form optimization, and transparent workflow visualization.
This article outlines a comprehensive web system architecture, detailing the layered components—from flexible load‑balancing strategies and service communication layers to various storage solutions—while highlighting practical considerations, trade‑offs, and best‑practice recommendations for building scalable, reliable backend services.
The article explains how a microkernel architecture separates a stable core from plug‑in components, enabling static and dynamic composition through annotations or configuration files, illustrated by e‑commerce checkout and iQIYI payment redesign, and introduces the open‑source Navi framework for declarative matcher‑based component selection, highlighting extensibility as essential for rapid business growth.
This article explains the fundamentals of microservices, contrasts them with monolithic architectures, outlines the pros and cons of each approach, and highlights key characteristics, benefits, and challenges of adopting a microservice‑based backend design.
The author reflects on a four‑year journey of refactoring a complex system into a lightweight, service‑oriented architecture, emphasizing how breaking down monolithic deployments, adopting modular services, and enforcing disciplined conventions can restore simplicity, flexibility, and efficiency in backend development.
The article shares a senior engineer’s perspective on evolving payment system architectures—from a simple monolithic WAR package, through a duplicated “chimney” style, to a fully modular micro‑service platform—highlighting why each generation fits different business stages and how domain‑driven design supports rapid market growth.
This article explores the essence of system architecture for massive web services, illustrating strategic and tactical considerations through examples like Uber and Weibo, and discusses key capabilities such as abstraction, classification, performance, service decomposition, multi‑level caching, distributed tracing, and continuous learning for scalable backend design.
This article explains the multi‑layer data architecture design for microservice systems, covering concepts such as data usability, primary and secondary data decoupling, sharding, multi‑source data adaptation and caching, and introduces data marts to improve scalability and maintainability.
This article explains how to model a comment system as a tree structure, defines node attributes and enums in C, and discusses handling deletions, replies, and conversation lists while keeping the data model extensible for future features.
This article presents a comprehensive case study on redesigning an e‑commerce backend workbench, detailing how designers redefined commercial value, conducted agile user research, set product goals for buyer and seller interfaces, and applied systematic interaction, visual, and motion design to create a productized solution.
This article analyzes the flash‑sale (seckill) business model, outlines its unique technical challenges such as impact on existing services, database load, bandwidth spikes, URL security, button activation, and order handling, and then presents a comprehensive backend architecture, design principles, code examples, database sharding, caching, and consistency strategies to reliably support massive concurrent purchases.
Designing Quanmin K‑Song’s high‑scale messaging system requires careful capacity estimation of throughput, storage and network traffic, robust consistency via unique transaction IDs and operation logs, and avalanche prevention through selective retries, scaling and priority‑based throttling to maintain reliability under load.
This article chronicles the four-stage evolution of the 58 Bangbang instant messaging platform’s architecture—from a traditional IM system to a merchant management platform, then to a mobile marketing tool, and finally to a high‑throughput mobile push solution—detailing design choices, scaling strategies, and technology stacks used.
This article details the design and implementation of a notification system, covering data models for notifications, user queues, subscription configurations, and a service layer with methods for creating, pulling, and managing announcements, reminders, and messages.
This article outlines essential design principles—availability, performance, reliability, scalability, manageability, and cost—and practical techniques such as service separation, redundancy, partitioning, caching, proxies, indexing, load balancing, and queuing to help engineers construct high‑performance, fault‑tolerant web systems.
This article explores the essential design considerations for building a short URL service, covering data structures, encoding algorithms, key length choices, capacity planning, sharding strategies, concurrency handling, network architecture, security measures, and a real‑world example.
This article presents Sogou's design for a highly available, high‑performance, and horizontally scalable business platform, illustrating key architectural components and scalability strategies through a series of diagrams.
