Amazon coding interview
Round 4 of 7 · 76 questions reported
- Length
- 55 min
- Format
- Usually two rounds; one is often an object-oriented design built in steps
- They grade
- Clarifying an under-specified prompt, clean class design, compilable code, edge cases
- AI use
- No AI
- Heads-up
- Every round also asks Leadership Principles questions.
Questions Amazon asks in this round 76
- Implement an LRU cacheOct 2026 · often
- Services that go down when their dependencies shut downAug 2026 · often
- Unix find command with pluggable filtersSep 2026 · sometimes
- Lowest common manager in an org chartOct 2026 · rarely
- Word search with a word search II follow-upSep 2026 · rarely
- Sliding-window request rate limiterSep 2026 · rarely
- Oldest one-time visitor in a login streamApr 2026 · rarely
- Merge ordered streamsSep 2026 · once
- Mini spreadsheet with formulas and cycle detectionAug 2026 · once
- Rearrange a string so no neighbours matchAug 2026 · once
- Maximum overlap of closed intervalsJul 2026 · once
- Caesar cipher with wraparound shiftsJun 2026 · once
- Best k-day run in a cyclic sprint schedule
- Cake order fulfillment check
- Compress an n-ary tree by promoting children
- Connect points that share a row or column
- Count distinct passwords from one substring reversal
- Count redundant substrings by vowel and consonant weights
- Count reverse-complement DNA strand pairs
- Count warehouse robots boxed in on all four sides
- Days needed to finish recurring tasks
- Design a blackjack game
- Design a chess game
- Design a coffee maker
- Design a food delivery system (object-oriented)
- Design a hotel booking system (object-oriented)
- Design a library management system
- Design a parking lot
- Design a pizza price calculator
- Design a restaurant reservation service
- Design a traffic light control system
- Design a vending machine
- Design a voting system
- Design Amazon Kindle (object-oriented)
- Design Amazon Locker (object-oriented)
- Design an ATM
- Design an elevator control system
- Design tic-tac-toe
- Design Unix file search
- Detect disguised abusive words in comments
- Disk block writes with limited write cycles
- Fewest append-to-end moves to reverse a binary image
- Fewest decrements to make an array a 1-to-k-to-1 pyramid
- Fit the most tasks into an hour across machine slots
- Fleet capacity after server id replacements
- Frequent user events within a 24-hour window
- Insert plus, times and parentheses to reach a target
- Largest value shared by two BSTs
- Longest ON run with k range flips
- Longest path in a DAG from an edge list
- Maximize minus signs with positive prefix sums
- Maximize total cluster throughput from median-of-three servers
- Maximum combination health of AI modules
- Maximum stability of a server group
- Meeting room scheduler over a fixed set of rooms
- Minimum cost to clear a binary array with k-wide windows
- Minimum daily reading pace to finish a textbook
- Minimum starting battery for a task queue
- Pascal triangle digit encryption
- Password similarity under cyclic character bumps
- Place books on the least-full allowed shelf
- Process queue with wait limits
- Regex matcher with starred groups
- Remove items so any k prices stay under a threshold
- Root-started value path in an N-ary tree
- Route a request along diagonal server redirects
- Shift security units left to protect the most population
- Smallest free hub for a task
- Smallest palindrome from a symmetric string's letters
- Sort an array with rotate and flip operations
- Sort words by a custom alphabet
- Spell a word with letter blocks, one block per letter
- Split a string into blocks that match the prefix's letter counts
- Split parcels into the most balanced shipments
- Take down servers in a reliability drill with minimum total requests
- Two-player card game simulation
About the Amazon coding round
What does Amazon ask in the coding round?
The most asked: Implement an LRU cache, Services that go down when their dependencies shut down and Unix find command with pluggable filters. 76 questions reported in all.
How long is the Amazon coding round?
About 55 minutes.
What is the Amazon coding round like?
Usually two rounds; one is often an object-oriented design built in steps. They grade: Clarifying an under-specified prompt, clean class design, compilable code, edge cases.
Can you use AI in the Amazon coding round?
No AI.