Application Developer Application DeveloperProgramming LanguagesJavaObject-Oriented ProgrammingJava APIs and FrameworksJava Development ToolsPythonSyntax and Control StructuresPython Libraries and FrameworksScripting and AutomationJavaScriptDOM ManipulationAJAX and Fetch APIJavaScript Frameworks (e.g., React, Angular, Vue.js)Web DevelopmentHTMLStructure and TagsForms and Input ValidationSemantic MarkupCSSSelectors and Box ModelLayouts and Responsive DesignCSS Frameworks (e.g., Bootstrap, Material-UI)Server-Side DevelopmentHTTP and REST APIsWeb Servers (e.g., Node.js, Apache, Nginx)Server-Side Frameworks (e.g., Express.js, Django, Ruby on Rails)Front-End FrameworksReactAngularVue.jsSingle-Page Applications (SPAs)Database ManagementRelational DatabasesSQL and Database DesignMySQL, PostgreSQL, OracleDatabase AdministrationNoSQL DatabasesMongoDB, Cassandra, RedisDocument, Key-Value, and Column-Family DatabasesQuerying and Data ModelingORM (Object-Relational Mapping)Hibernate, Sequelize, SQLAlchemyMapping Objects to DatabasesDatabase AbstractionSoftware Development LifecycleVersion ControlGit, SVN, MercurialBranching and MergingCollaboration and Code ReviewSoftware TestingUnit TestingIntegration TestingTest AutomationContinuous Integration/Continuous Deployment (CI/CD)Jenkins, Travis CI, GitLab CI/CDBuild Pipelines and Deployment AutomationAgile MethodologiesScrum, Kanban, LeanUser Stories and SprintsAgile Project Management Tools (e.g., Jira, Trello)Mobile DevelopmentAndroid DevelopmentJava or KotlinAndroid SDK and APIsAndroid Studio and EmulatorsiOS DevelopmentSwift or Objective-CiOS SDK and APIsXcode and SimulatorsApp Store Submission GuidelinesSoftware ArchitectureDesign PatternsCreational, Structural, and Behavioral PatternsSingleton, Factory, Observer, MVCGang of Four (GoF) PatternsMicroservicesService-Oriented Architecture (SOA)RESTful APIs and API GatewaysContainerization (e.g., Docker, Kubernetes)Scalability and PerformanceCaching and Load BalancingHorizontal and Vertical ScalingPerformance Monitoring and OptimizationSecurityWeb Application SecurityAuthentication and AuthorizationEncryption and HashingSecurity Best PracticesAdditional SkillsData Structures and AlgorithmsArray, Linked List, Tree, GraphSorting and Searching AlgorithmsComplexity AnalysisDevOpsInfrastructure as Code (IaC)Configuration Management (e.g., Ansible, Chef, Puppet)Cloud Computing (e.g., AWS, Azure, GCP)Monitoring and LoggingUser Experience (UX) DesignWireframing and PrototypingUser-Centered Design PrinciplesUsability TestingSoftware DocumentationTechnical WritingAPI DocumentationDiagramming and UMLProject ManagementScope Definition and PlanningResource Allocation and Time ManagementRisk Assessment and Mitigation