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home / skills / dauquangthanh / hanoi-rainbow
dauquangthanh/hanoi-rainbow
Agent Skills, Custom Agents and Corresponding Software Development Workflow Commands.
41 skills
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pseudocode-to-specification
dauquangthanh/hanoi-rainbow
2
Analyzes pseudocode, algorithms, or code snippets to extract and document functional requirements and business specifications. Produces functional specifications, business logic documentation, data requirements, and workflow specifications focused exclusively on WHAT the system does, not HOW it's implemented. Use when analyzing pseudocode for business logic, extracting functional requirements from algorithms, documenting business behavior from code, reverse engineering functional specifications, or when users mention "pseudocode to spec", "extract requirements", "business logic documentation", "functional specification from code", or "requirements from pseudocode".
cobol-migration-analyzer
dauquangthanh/hanoi-rainbow
2
Analyzes legacy COBOL programs and JCL jobs to assist with migration to modern Java applications. Extracts business logic, identifies dependencies, generates migration reports, and creates Java implementation strategies. Use when working with mainframe migration, COBOL analysis, legacy system modernization, JCL workflows, or when users mention COBOL to Java conversion, analyzing .cbl/.CBL/.cob files, working with copybooks, or planning Java service implementations from COBOL programs.
code-refactoring
dauquangthanh/hanoi-rainbow
2
Guides systematic code refactoring to improve code quality, maintainability, and design. Identifies code smells, applies refactoring patterns, ensures test coverage, and follows safe refactoring practices. Produces cleaner, more maintainable code while preserving functionality. Use when improving code quality, eliminating technical debt, preparing for feature additions, addressing code smells, or when users mention refactoring, code cleanup, improving design, reducing complexity, or modernizing legacy code.
project-planning
dauquangthanh/hanoi-rainbow
2
Guides comprehensive software project planning including task breakdown, estimation, sprint planning, backlog management, resource allocation, milestone tracking, and risk management. Creates user stories, acceptance criteria, project roadmaps, and work breakdown structures. Use when planning software projects, organizing sprints, breaking down features into tasks, estimating effort, managing backlogs, or when users mention "project planning", "sprint planning", "task breakdown", "roadmap", "backlog management", "user stories", or "project estimation".
git-commit
dauquangthanh/hanoi-rainbow
2
Generates well-structured git commit messages following conventional commit standards and best practices. Creates clear, descriptive commits with proper type prefixes (feat, fix, docs, refactor, etc.), concise subjects, and detailed bodies when needed. Use when committing code changes, creating git commits, writing commit messages, or when users mention "commit", "git commit", "commit message", "conventional commits", "changelog", or need help structuring version control messages. Ensures commits are atomic, descriptive, and follow team conventions.
devops
dauquangthanh/hanoi-rainbow
2
Provides comprehensive DevOps guidance including CI/CD pipeline design, infrastructure as code (Terraform, CloudFormation, Bicep), container orchestration (Docker, Kubernetes), deployment strategies (blue-green, canary, rolling), monitoring and observability, configuration management (Ansible, Chef, Puppet), and cloud platform automation (AWS, GCP, Azure). Produces deployment scripts, pipeline configurations, infrastructure code, and operational procedures. Use when designing CI/CD pipelines, automating infrastructure, containerizing applications, setting up monitoring, implementing deployment strategies, managing configurations, or when users mention DevOps, CI/CD, infrastructure automation, Kubernetes, Docker, Terraform, deployment, monitoring, or cloud operations.
integration-testing
dauquangthanh/hanoi-rainbow
2
Designs comprehensive integration testing strategies including API testing, database testing, microservices testing, end-to-end testing, and test automation frameworks. Produces test plans, test cases, test data strategies, and CI/CD integration. Use when designing test strategies, writing integration tests, setting up test automation, testing APIs, testing microservices, or when users mention integration testing, API testing, E2E testing, test automation, or quality assurance.
requirements-gathering
dauquangthanh/hanoi-rainbow
2
Guides comprehensive requirements gathering and analysis including stakeholder interviews, user story creation, use case documentation, acceptance criteria, requirements prioritization, and traceability. Produces requirements documents, user stories, use cases, and development roadmaps. Use when gathering requirements, writing user stories, creating acceptance criteria, analyzing stakeholder needs, prioritizing features, or when users mention requirements analysis, business analysis, user stories, use cases, or requirements documentation.
requirement-review
dauquangthanh/hanoi-rainbow
2
Conducts comprehensive requirements review including completeness validation, clarity assessment, consistency checking, testability evaluation, and standards compliance. Produces detailed review reports with findings, gaps, conflicts, and improvement recommendations. Use when reviewing requirements documents (BRD, SRS, user stories), validating acceptance criteria, assessing requirements quality, identifying gaps and conflicts, or ensuring standards compliance (IEEE 830, INVEST criteria). Trigger when users mention "review requirements", "validate requirements", "check requirements quality", "find requirement issues", or "assess BRD/SRS quality".
ibm-mainframe
dauquangthanh/hanoi-rainbow
2
Provides comprehensive IBM Mainframe administration, development, and modernization guidance including z/OS operations, JCL scripting, COBOL/PL/I programming, CICS/IMS configuration, DB2 administration, TSO/ISPF usage, system programming, batch processing, and mainframe-to-cloud migration strategies. Covers mainframe security (RACF, ACF2), performance tuning, capacity planning, disaster recovery, and DevOps integration. Use when working with mainframe systems, z/OS, JES2/JES3, VTAM, USS, or when users mention "mainframe", "z/OS", "MVS", "TSO", "ISPF", "JCL", "CICS", "IMS", "DB2 mainframe", "VSAM", "RACF", "mainframe modernization", "legacy mainframe", or "IBM z Systems".
alibaba-cloud
dauquangthanh/hanoi-rainbow
2
Provides comprehensive Alibaba Cloud (Aliyun) guidance including ECS, ApsaraDB, OSS, SLB, VPC, RAM, ACK (Kubernetes), Function Compute, API Gateway, CDN, and monitoring services. Covers infrastructure provisioning with Terraform/ROS, cloud architecture design, security best practices, cost optimization, and migration strategies. Produces infrastructure code, deployment scripts, architecture diagrams, and operational procedures. Use when working with Alibaba Cloud services, designing cloud architecture on Aliyun, migrating to Alibaba Cloud, setting up Chinese cloud infrastructure, implementing multi-region deployments in China, or when users mention Alibaba Cloud, Aliyun, ECS, OSS, ApsaraDB, ACK, RDS, SLB, or Chinese cloud computing.
application-migration
dauquangthanh/hanoi-rainbow
2
Guides comprehensive application migration projects including legacy system modernization, cloud migration, technology stack upgrades, database migration, and architecture transformation. Covers assessment, planning, migration strategies (strangler fig, big bang, phased), risk management, data migration, testing, and cutover. Use when migrating applications, modernizing legacy systems, moving to cloud, changing technology stacks, or when users mention "migration", "modernization", "replatform", "lift and shift", "refactor", "strangler pattern", or "legacy transformation".
architecture-design-review
dauquangthanh/hanoi-rainbow
2
Conducts comprehensive architecture design reviews including system design validation, architecture pattern assessment, quality attributes evaluation, technology stack review, and scalability analysis. Produces detailed review reports with findings, recommendations, and risk assessments. Use when reviewing software architecture designs, validating architecture decisions, assessing system scalability, evaluating technology choices, or when users mention architecture review, design assessment, technical review, or architecture validation.
azure-cloud
dauquangthanh/hanoi-rainbow
2
Provides comprehensive Microsoft Azure guidance including Azure Virtual Machines, Azure Storage (Blob, Files, Disks), Azure SQL Database, Azure App Service, Azure Functions, AKS (Azure Kubernetes Service), Azure DevOps, ARM templates, Bicep, Terraform for Azure, Azure Active Directory, Azure Key Vault, Azure Monitor, cost optimization, and multi-region deployment. Produces infrastructure as code (Terraform/Bicep/ARM), deployment scripts, security configurations, and architecture designs. Use when deploying to Azure, designing Azure infrastructure, migrating to Microsoft Azure, configuring VMs, setting up Azure Storage, managing Azure SQL, working with AKS, or when users mention Azure, Microsoft Cloud, Azure Portal, ARM templates, Bicep, Azure Functions, App Service, or Azure DevOps.
frontend-ui-ux-design
dauquangthanh/hanoi-rainbow
2
Creates comprehensive frontend UI/UX designs including user interfaces, design systems, component libraries, responsive layouts, and accessibility implementations. Produces wireframes, mockups, design specifications, and implementation guidelines. Use when designing user interfaces, creating design systems, building component libraries, implementing responsive designs, ensuring accessibility compliance, or when users mention UI design, UX design, interface design, design systems, user experience, or frontend design patterns.
backend-design-review
dauquangthanh/hanoi-rainbow
2
Conducts comprehensive backend design reviews covering API design quality, database architecture validation, microservices patterns assessment, integration strategies evaluation, security design review, and scalability analysis. Evaluates API specifications (REST, GraphQL, gRPC), database schemas, service boundaries, authentication/authorization flows, caching strategies, message queues, and deployment architectures. Identifies design flaws, security vulnerabilities, performance bottlenecks, and scalability issues. Produces detailed design review reports with severity-rated findings, architecture diagrams, and implementation recommendations. Use when reviewing backend system designs, validating API specifications, assessing database schemas, evaluating microservices architectures, reviewing integration patterns, or when users mention backend design review, API design validation, database design review, microservices assessment, or backend architecture evaluation.
frontend-coding
dauquangthanh/hanoi-rainbow
2
Expert frontend development guidance covering React, Vue, Angular, TypeScript, state management, component architecture, performance optimization, accessibility, testing, and modern web APIs. Produces production-ready, maintainable, and performant frontend code with best practices. Use when building web applications, implementing UI components, managing application state, optimizing performance, or when users mention React, Vue, Angular, TypeScript, hooks, state management, components, or frontend development.
aws-cloud
dauquangthanh/hanoi-rainbow
2
Provides comprehensive AWS (Amazon Web Services) guidance including EC2, S3, RDS, Lambda, ECS/EKS, CloudFormation, API Gateway, CloudFront, cloud migration from on-premise/GCP/Azure, security configuration (IAM, KMS, Security Hub), cost optimization (Savings Plans, Reserved Instances), and multi-region deployment. Produces infrastructure as code (Terraform/CloudFormation/CDK), deployment scripts, security configurations, and architecture designs. Use when deploying to AWS, designing AWS infrastructure, migrating to AWS, configuring EC2 instances, setting up S3 buckets, managing RDS databases, deploying containers on ECS/EKS, building serverless applications, or when users mention AWS, Amazon Cloud, EC2, S3, Lambda, EKS, CloudFormation, CDK, or AWS services.
mockup-creation
dauquangthanh/hanoi-rainbow
2
Create interactive, production-ready UI mockups and prototypes using NuxtJS 4 (Vue) or Next.js (React), TypeScript, and TailwindCSS v4. Use when building web mockups, prototypes, landing pages, dashboards, admin panels, or interactive UI demonstrations. Trigger when users mention "create mockup", "build prototype", "interactive demo", "UI prototype", "design to code", or need rapid frontend development with modern tooling. Prefer NuxtJS for Vue-based projects; use Next.js when users mention ReactJS.
keycloak-administration
dauquangthanh/hanoi-rainbow
2
Provides comprehensive KeyCloak administration guidance including realm management, user/group administration, client configuration, authentication flows, identity brokering, authorization policies, security hardening, and troubleshooting. Covers SSO configuration, SAML/OIDC setup, role-based access control (RBAC), user federation (LDAP/AD), social login integration, multi-factor authentication (MFA), and high availability deployments. Use when configuring KeyCloak, setting up SSO, managing realms and clients, troubleshooting authentication issues, implementing RBAC, or when users mention "KeyCloak", "SSO", "OIDC", "SAML", "identity provider", "IAM", "authentication flow", "user federation", "realm configuration", or "access management".
pli-migration-analyzer
dauquangthanh/hanoi-rainbow
2
Analyzes legacy PL/I (Programming Language One) programs to assist with migration to modern Java applications. Extracts business logic, data structures, procedure definitions, and file operations from PL/I code. Generates migration reports and creates Java implementation strategies. Use when working with mainframe migration, PL/I analysis, legacy system modernization, or when users mention PL/I to Java conversion, analyzing .pli/.PLI/.pl1 files, working with PL/I procedures, or planning Java service implementations from PL/I programs.
bug-analysis
dauquangthanh/hanoi-rainbow
2
Analyzes software bugs including root cause identification, severity assessment, impact analysis, reproduction steps validation, and fix recommendations. Performs bug triage, categorization, duplicate detection, and regression analysis. Use when investigating bugs, analyzing crash reports, triaging issues, debugging problems, reviewing error logs, or when users mention "analyze bug", "investigate issue", "debug problem", "bug report", "crash analysis", "root cause analysis", or "fix recommendation".
fujitsu-mainframe
dauquangthanh/hanoi-rainbow
2
Analyzes and assists with Fujitsu mainframe systems including FACOM, PRIMERGY, BS2000/OSD, OSIV/MSP, OSIV/XSP, NetCOBOL, PowerCOBOL, and Fujitsu JCL. Extracts business logic from Fujitsu COBOL programs, analyzes Fujitsu JCL jobs, migrates Fujitsu mainframe applications to modern platforms (Java, cloud, containers), and creates migration strategies. Use when working with Fujitsu mainframe migration, FACOM systems, BS2000, OSIV platforms, NetCOBOL, PowerCOBOL, Fujitsu-specific COBOL extensions, Fujitsu JCL, or when users mention Fujitsu mainframe modernization, analyzing Fujitsu COBOL/JCL, SYMFOWARE database, or planning migration from Fujitsu legacy systems.
code-security-review
dauquangthanh/hanoi-rainbow
2
Conducts comprehensive security code reviews including vulnerability detection (OWASP Top 10, CWE), authentication/authorization flaws, injection attacks, cryptography issues, sensitive data exposure, API security, dependency vulnerabilities, security misconfigurations, and compliance validation (PCI-DSS, GDPR, HIPAA). Produces detailed security assessment reports with CVE references, CVSS scores, exploit scenarios, and remediation guidance. Use when reviewing code security, performing security audits, checking for vulnerabilities, validating security controls, assessing security risks, or when users mention "security review", "vulnerability scan", "security audit", "penetration test", "OWASP", "security assessment", "secure coding", or "security compliance".
google-cloud
dauquangthanh/hanoi-rainbow
2
Provides comprehensive Google Cloud Platform (GCP) guidance including Compute Engine, Cloud Storage, Cloud SQL, BigQuery, GKE (Google Kubernetes Engine), Cloud Functions, Cloud Run, VPC networking, load balancing, IAM, Cloud Build, infrastructure as code (Terraform, Deployment Manager), security configuration, cost optimization, and multi-region deployment. Produces infrastructure code, deployment scripts, configuration guides, and architecture designs. Use when deploying to Google Cloud, designing GCP infrastructure, migrating to GCP, configuring GCE instances, setting up Cloud Storage, managing Cloud SQL databases, working with BigQuery, deploying to GKE, or when users mention "Google Cloud", "GCP", "Compute Engine", "Cloud Storage", "BigQuery", "GKE", "Cloud Run", "Cloud Functions", "VPC", "Cloud SQL", or "Google Cloud Platform".
system-migration
dauquangthanh/hanoi-rainbow
2
Guides operating system and hardware platform migrations including Linux distribution changes, Windows to Linux migration, mainframe to x86 modernization, data center migrations (physical to virtual, P2V, V2V), hardware platform changes, system consolidation, and legacy system decommissioning. Covers OS compatibility, driver migration, system configuration transfer, and cutover procedures. Use when migrating operating systems, changing hardware platforms, moving from mainframes, or when users mention "OS migration", "Linux migration", "mainframe modernization", "P2V migration", "system upgrade", "data center migration", or "legacy system replacement".
frontend-design-review
dauquangthanh/hanoi-rainbow
2
Conducts comprehensive frontend design reviews covering UI/UX design quality, design system validation, accessibility compliance, responsive design patterns, component library architecture, and visual design consistency. Evaluates design specifications, Figma/Sketch files, design tokens, interaction patterns, and user experience flows. Identifies usability issues, accessibility violations, design system deviations, and provides actionable recommendations for improvement. Produces detailed design review reports with severity-rated findings, visual examples, and implementation guidelines. Use when reviewing frontend designs, validating design systems, ensuring accessibility compliance, evaluating component libraries, assessing responsive designs, or when users mention design review, UI/UX review, Figma review, design system validation, accessibility audit, or frontend design quality.
platform-migration
dauquangthanh/hanoi-rainbow
2
Guides infrastructure and platform migration including cloud-to-cloud migration (AWS to GCP, Azure to AWS), Kubernetes cluster migration, CI/CD platform changes, monitoring stack migration, identity provider migration, and network infrastructure transformation. Covers IaC migration, container orchestration, service mesh, observability tools, and multi-cloud strategies. Use when migrating infrastructure, changing cloud providers, moving Kubernetes clusters, or when users mention "cloud migration", "platform switch", "infrastructure migration", "K8s migration", "multi-cloud", or "cloud provider change".
code-quality-review
dauquangthanh/hanoi-rainbow
2
Conducts comprehensive code quality reviews including code smells detection, maintainability assessment, complexity analysis, design pattern evaluation, naming conventions, code duplication, technical debt identification, and best practices validation. Produces detailed review reports with specific issues, severity ratings, metrics analysis, and actionable improvement recommendations. Use when reviewing code quality, analyzing code maintainability, detecting code smells, checking coding standards, measuring code complexity, identifying technical debt, or when users mention "code quality review", "code quality check", "maintainability analysis", "code smells", "clean code", "refactoring candidates", or "technical debt assessment".
jcl-migration-analyzer
dauquangthanh/hanoi-rainbow
2
Analyzes legacy JCL (Job Control Language) scripts to assist with migration to modern workflow orchestration and batch processing systems. Extracts job flows, step sequences, data dependencies, conditional logic, and program invocations. Generates migration reports and creates implementation strategies for Spring Batch, Apache Airflow, or shell scripts. Use when working with mainframe job migration, JCL analysis, batch workflow modernization, or when users mention JCL conversion, analyzing .jcl/.JCL files, working with job steps, procedures, or planning workflow orchestration from JCL jobs.
architecture-design
dauquangthanh/hanoi-rainbow
2
Designs comprehensive software solution architectures including system components, technology stacks, integration patterns, scalability strategies, and deployment models. Produces architecture diagrams, technical specifications, and implementation roadmaps. Use when planning new software systems, modernizing legacy applications, designing microservices, evaluating technology choices, creating architecture documentation, or when users mention system design, architecture patterns, scalability planning, or technical architecture decisions.
oracle-cloud
dauquangthanh/hanoi-rainbow
2
Provides comprehensive Oracle Cloud Infrastructure (OCI) guidance including compute instances, networking (VCN, load balancers, VPN), storage (block, object, file), database services (Autonomous Database, MySQL, NoSQL), container orchestration (OKE), identity and access management (IAM), resource management, cost optimization, and infrastructure as code (Terraform OCI provider, Resource Manager). Produces infrastructure code, deployment scripts, configuration guides, and architectural diagrams. Use when designing OCI architecture, provisioning cloud resources, migrating to Oracle Cloud, implementing OCI security, setting up OCI databases, deploying containerized applications on OKE, managing OCI resources, or when users mention "Oracle Cloud", "OCI", "Autonomous Database", "VCN", "OKE", "OCI Terraform", "Resource Manager", "Oracle Cloud Infrastructure", or "OCI migration".
database-design
dauquangthanh/hanoi-rainbow
2
Designs comprehensive database schemas including relational and NoSQL models, normalization, indexing strategies, relationship modeling, data types, constraints, and performance optimization. Covers entity-relationship diagrams, schema migrations, partitioning, and best practices for PostgreSQL, MySQL, MongoDB, and other databases. Use when designing databases, creating schemas, modeling data, optimizing queries, or when users mention "database design", "schema design", "data modeling", "ERD", "normalization", "indexing", or "database architecture".
database-migration
dauquangthanh/hanoi-rainbow
2
Guides database migration projects including engine changes (MySQL to PostgreSQL, Oracle to PostgreSQL, SQL Server to PostgreSQL), version upgrades, cloud migrations (on-premise to RDS/Cloud SQL/Azure Database), schema migrations, zero-downtime migrations, replication setup, and data migration strategies. Covers homogeneous and heterogeneous migrations, ETL processes, cutover procedures, and rollback plans. Use when migrating databases, changing database engines, upgrading database versions, moving databases to cloud, or when users mention "database migration", "DB migration", "PostgreSQL migration", "MySQL to Postgres", "Oracle migration", "database upgrade", or "cloud database migration".
frontend-code-review
dauquangthanh/hanoi-rainbow
2
Conducts comprehensive frontend code reviews including React/Vue/Angular component analysis, TypeScript/JavaScript quality assessment, CSS/styling review, performance optimization, accessibility compliance, security vulnerabilities, and best practices validation. Produces detailed review reports with specific issues, severity ratings, and actionable recommendations. Use when reviewing frontend code, analyzing React/Vue/Angular components, checking JavaScript/TypeScript quality, validating CSS/SCSS, assessing web performance, or when users mention "review frontend code", "check React components", "analyze JavaScript", "review TypeScript", "validate accessibility", or "frontend code quality".
rpg-migration-analyzer
dauquangthanh/hanoi-rainbow
2
Analyzes legacy RPG (Report Program Generator) programs from AS/400 and IBM i systems for migration to modern Java applications. Extracts business logic from RPG III/IV/ILE source code, identifies data structures (D-specs), file operations (F-specs), program dependencies (CALLB/CALLP), and converts RPG constructs to Java equivalents. Generates migration reports, complexity estimates, and Java implementation strategies with POJO classes, JPA entities, and service methods. Use when modernizing AS/400 or IBM i legacy systems, analyzing RPG source files (.rpg, .rpgle, .RPGLE), converting RPG to Java, mapping data specifications to Java classes, planning legacy system migration, or when user mentions RPG analysis, Report Program Generator, RPG III/IV/ILE, AS/400 modernization, IBM i migration, packed decimal conversion, or mainframe application rewrite.
technical-writing
dauquangthanh/hanoi-rainbow
2
Creates high-quality technical documentation including API documentation, user guides, tutorials, architecture documents, README files, release notes, and technical specifications. Produces clear, structured, and comprehensive documentation following industry best practices. Use when writing technical documentation, creating API docs, developing user guides, documenting architecture, writing tutorials, preparing release notes, or when users mention "technical writing", "documentation", "API docs", "user guide", "tutorial", "README", "technical specification", "architecture document", or "developer documentation".
ibm-cloud
dauquangthanh/hanoi-rainbow
2
Provides comprehensive IBM Cloud platform guidance including compute services (VPC, Virtual Servers, IKS, OpenShift, Code Engine, Cloud Functions), storage (Object Storage, Block Storage, File Storage), databases (Db2, Cloudant, PostgreSQL, MySQL, MongoDB, Redis), IAM security (access groups, service IDs, Key Protect, Secrets Manager), networking (VPC, load balancers, Direct Link), CLI automation, Terraform/Schematics infrastructure as code, monitoring, and cost optimization. Covers infrastructure provisioning, application deployment, security configuration, multi-zone high availability, and operational best practices. Use when working with IBM Cloud services, deploying cloud infrastructure, managing cloud resources, configuring security and networking, or when users mention "IBM Cloud", "IKS", "Code Engine", "Db2", "Cloudant", "VPC", "cloud provisioning", "IBM Kubernetes", "OpenShift", "Terraform IBM", "Schematics", or "IBM cloud platform".
backend-code-review
dauquangthanh/hanoi-rainbow
2
Conducts comprehensive backend code reviews including API design (REST/GraphQL/gRPC), database patterns, authentication/authorization, caching strategies, message queues, microservices architecture, security vulnerabilities, and performance optimization for Node.js, Python, Java, Go, and C#. Produces detailed review reports with specific issues, severity ratings, and actionable recommendations. Use when reviewing server-side code, analyzing API implementations, checking database queries, validating authentication flows, assessing microservices architecture, or when users mention "review backend code", "check API design", "analyze server code", "validate database patterns", "security audit", "performance review", or "backend code quality".
backend-coding
dauquangthanh/hanoi-rainbow
2
Expert backend development guidance covering Node.js, Python, Java, Go, API design (REST/GraphQL/gRPC), database patterns, authentication, caching, message queues, microservices, and testing. Produces production-ready, scalable, and secure backend code with industry best practices. Use when building APIs, implementing business logic, designing data models, integrating services, or when users mention backend development, server-side code, APIs, databases, or microservices.
backend-design
dauquangthanh/hanoi-rainbow
2
Designs comprehensive backend systems including RESTful APIs, microservices, database architecture, authentication/authorization, caching strategies, message queues, and scalability patterns. Produces API specifications, database schemas, architecture diagrams, and implementation guides. Use when designing backend services, APIs, data models, distributed systems, authentication flows, or when users mention backend architecture, API design, database design, microservices, or server-side development.