Amazon Coding Interview Questions 2025

Amazon Coding Interview Questions: 2025 Guide with Real Examples and Insider Strategies

Preparing for ​Amazon coding interview questions​ in 2025 requires mastering core algorithms, system design principles, and Amazon’s Leadership Principles. This guide provides actionable insights into Amazon’s coding interview process, real-world examples, and proven strategies to help candidates excel in technical rounds.

​Amazon Coding Interview Process Overview​

Amazon’s coding interviews focus on problem-solving, algorithmic efficiency, and scalability. The process typically includes:

1. ​Online Assessment (OA): A 70-90-minute coding challenge with 2 algorithmic questions, often testing arrays, trees, and string manipulation.
2. ​Technical Phone Screen: A 45-60-minute session with a hiring manager or engineer, covering coding problems and behavioral questions.
3. ​Onsite/Loop Interviews: 4-5 rounds, including:
   • ​Coding Rounds: Solve medium-difficulty problems (e.g., dynamic programming, graph traversal).
   • ​System Design: Design scalable systems (e.g., real-time ride-sharing services).
   • ​Behavioral Rounds: Align answers with Amazon’s 16 Leadership Principles.

​Top Amazon Coding Interview Questions for 2025​

​1. Algorithmic Problems​

• ​Longest Substring Matching Regex​
  • Problem: Given a text string and a regex with one wildcard (*), find the longest substring that matches the regex.
  • Solution: Use dynamic programming to track possible wildcard expansions and compare substrings.
• ​Earliest Non-Repeating Character in a Stream​
  • Problem: Design a data structure to return the oldest non-repeating character in O(1) time.
  • Solution: Combine a doubly linked list (to track order) and a hashmap (for quick lookups).
• ​Connected Cells in a Grid​
  • Problem: Find the largest region of connected cells in a binary matrix.
  • Solution: Apply DFS or BFS to traverse connected components.

​2. Data Structure Challenges​

• ​Binary Tree Node Distance​
  • Problem: Find the path length between two nodes in a binary tree.
  • Solution: Use LCA (Lowest Common Ancestor) to calculate distances.
• ​Maximum Subarray Sum​
  • Problem: Compute the maximum sum of contiguous and non-contiguous subarrays.
  • Solution: Kadane’s algorithm for contiguous sums; sum all positives for non-contiguous.

​3. System Design Integration​

• ​Design a Real-Time Notification System​
  • Task: Build a system where a buyer’s transaction triggers a social media notification.
  • Key Components: Use message queues (e.g., Amazon SQS) for decoupling and Redis for caching.

​How to Prepare for Amazon Coding Interviews​

​1. Master Core Algorithms​

• ​Focus Areas: Arrays, strings, trees, graphs, and dynamic programming.
• ​Practice Platforms: LeetCode (prioritize Amazon’s tagged problems) and HackerRank.

​2. Simulate Real Interviews​

• ​Mock Tools: Use Pramp or Interviewing.io for live coding practice with feedback.
• ​Time Management: Allocate 15-20 minutes per question during practice sessions.

​3. Optimize Code Quality​

• ​Best Practices:
  • Write clean, modular code with boundary checks.
  • Use meaningful variable names and avoid redundancy.

​4. Study Amazon’s Tech Stack​

• ​AWS Services: Familiarize yourself with S3, DynamoDB, and Lambda for system design rounds.

​Common Mistakes to Avoid​

1. ​Ignoring Edge Cases: Test for empty inputs, duplicates, and extreme values.
2. ​Overcomplicating Solutions: Prioritize readability and efficiency over clever hacks.
3. ​Poor Communication: Explain your thought process clearly, even if stuck.

​Amazon Coding Interview Questions​

Acing Amazon’s 2025 coding interviews demands a balance of technical rigor, structured problem-solving, and familiarity with Amazon’s ecosystem. By practicing high-frequency algorithms, refining code quality, and simulating real interview conditions, candidates can transform coding challenges into career opportunities. Bookmark this guide to stay ahead in Amazon’s competitive hiring landscape.