Redux

Custom Middleware

Logger Middleware From Scratch
Junior
Non-Blocking Analytics Middleware
Mid
Global Error Toast Middleware
Mid
Timing Logger Middleware
Mid
Auth Error Logout Middleware
Mid
Action Enrichment Middleware
Mid
Global Loading Slice With Middleware
Mid
Auth Guard Middleware via Action Meta
Senior
Debounce Middleware for Rapid Actions
Senior
Microtask Action-Batching Middleware
Senior

Rtk Query

Tasks Query and Toggle Mutation With Cache Tags
Mid
Configure Store With RTK Query Service
Mid
RTK Query Blog API Slice
Mid
Optimistic Like With RTK Query Rollback
Senior
Custom baseQuery With Token Refresh Retry
Senior
RTK Query Polling With Tab Pause
Senior
Infinite Scroll RTK Query Endpoint
Senior
Pessimistic Cache Sync With updateQueryData
Senior
Streaming Cache Updates via WebSocket
Senior

Async Thunks

Paginated List Fetcher Slice
Mid
Chained Fetch Thunk With createAsyncThunk
Mid
Login Thunk With createAsyncThunk
Mid
Debounced Search Thunk With AbortController
Senior
Optimistic Like With Rollback
Senior

Slices Reducer Logic

Theme Switcher Slice With Persistence
Junior
Settings Slice With Partial Merge
Junior
Shopping Cart Slice With Computed Totals
Mid
Normalize Nested API Response Into Entities
Mid
Cart Slice With Buy X Get Y Discount
Mid
Form Draft Slice With Commit
Mid
Multi-Step Registration Form Slice
Mid
createSlice Reducer With prepare Callback
Mid

Selectors Memoization

Memoized Product Filter Selector
Mid
Memoized Cross-Slice Recommendations Selector
Mid
Memoized Recursive Tree Selector
Senior
Per-Instance Memoized Selector Factory
Senior

Redux Saga

Poll Job Status With redux-saga
Senior
Saga Fetch Timeout With race
Senior
Debounced Search Saga With Cancellation
Senior
Redux-Saga Multi-Step Auth Flow
Senior
Concurrent File Uploads Saga
Senior

Redux Core Internals

Implement bindActionCreators From Scratch
Junior
Reimplement createStore Core
Mid
Implement combineReducers Utility
Mid
Build applyMiddleware and compose
Senior

Store Configuration Typing

Configure Store With configureStore
Mid
Reset Store on Logout Reducer
Mid

Side Effects Persistence Testing

Unit Test a Toggle Reducer
Junior
Normalize Nested Posts With createEntityAdapter
Mid
Auto-Dismissing Toast Notifications
Mid
Test createAsyncThunk Fulfilled and Rejected
Mid
Normalized Users & Posts With createEntityAdapter
Mid
Listener Middleware for Negative Balance
Mid
Persist Redux State With redux-persist
Mid
Undo/Redo History Reducer Enhancer
Senior
Selective Store Persistence and Rehydration
Senior
Polling Thunk With Cleanup
Senior

Top 152 Redux Interview Questions And Answers 2025 | TechPrep