Amazon Staff Software Engineer Interview Questions

1.Tell me about something you learned in the last year that completely changed how you approach technical problems. What triggered this learning?

2.Describe someone you've mentored who initially wasn't meeting the bar. What was the situation and how did you help them succeed?

3.Tell me about a time you fundamentally changed how your team thought about customers. What was the situation and what did you do?

4.Tell me about the most complex system or process you simplified in the past two years. What made it complex and how did you approach simplifying it?

5.Describe a time when you saw a critical problem outside your team's scope and decided to fix it yourself. What was the problem and what did you do?

6.Walk me through a significant technical decision you made with limited data. What information did you have, what was missing, and how did you decide?

7.Design the data model and API for Alexa's smart home device registry that tracks millions of connected devices across customer homes. Consider device state synchronization and offline scenarios.

8.Implement a circuit breaker pattern for Amazon's checkout service that calls the payments API. Include metrics collection and adaptive timeout behavior.

9.Write a function that finds the top K most frequently ordered products from Amazon's order history, given a stream of order events. Optimize for both memory and latency.

10.You're tasked with migrating a legacy monolith that handles Amazon's seller payments to microservices. What's your migration strategy and how do you ensure zero payment failures?

11.You're designing an auto-scaling system for Prime Video that handles 100x traffic spikes during live events like Thursday Night Football. How would you architect this using AWS services?

12.An Amazon Go store's computer vision system is incorrectly charging customers for items they put back on shelves. How would you debug this and what metrics would you implement?

13.Design the recommendation engine for Amazon.com's homepage that serves 300 million customers globally. How would you handle cold start problems for new customers and ensure recommendations stay fresh?

14.You need to design the inventory management system for Amazon's fulfillment centers that tracks millions of items across hundreds of warehouses. How do you ensure inventory accuracy while handling constant updates?

15.Design AWS Lambda's function execution environment that can handle millions of concurrent executions across multiple regions. Focus on container lifecycle management and resource isolation.

16.Design the order routing system that decides which fulfillment center ships each Prime order to meet next-day delivery promises. Consider inventory availability, shipping costs, and delivery windows.

17.Design the global content delivery system for Prime Video that streams to 100 million concurrent viewers during major sporting events. How do you handle geographic distribution and bandwidth optimization?

18.Design the product catalog search system for Amazon.com that handles billions of queries daily across hundreds of millions of products. Focus on relevance ranking and sub-second response times globally.

19.Tell me about a time you had to convince several teams to adopt a new approach or technology, but you didn't have direct authority over any of them. How did you build consensus?

20.Tell me about a time you had to choose between what was best for your team and what was best for the broader organization. How did you navigate that conflict?

21.Describe a time when you pushed back against a deadline or requirement from senior leadership because you believed it would compromise quality or customer experience. What happened?

22.Walk me through a time when you had to make a critical decision quickly with incomplete information while multiple teams were waiting on you. How did you decide and what was the outcome?

23.Tell me about the most significant operational failure you've been responsible for. How did you handle it in the moment, and what changes did you drive afterward?

24.Describe a situation where you inherited a team or project that was significantly behind schedule and demoralized. What did you do in your first 30 days, and how did you measure progress?

25.Prime membership grew by 15% last quarter, but average order frequency per member stayed flat. Walk me through how you'd investigate what's happening and what metrics you'd look at first.

26.Amazon's recommendation algorithm is showing very relevant products to customers, but average order value has declined 8% over six months. The ML team says their relevance metrics are at all-time highs. What could be happening?

27.You need to estimate how many additional EC2 instances AWS would need if every Alexa device doubled its API call frequency. Walk me through your calculation.

28.A seller on Amazon.com claims they're losing $50K monthly because their products aren't showing up in search results, but our search team says everything looks normal. How would you approach investigating this?

29.We're considering removing the one-click purchase button from mobile because it accounts for only 5% of mobile orders but requires significant engineering maintenance. How would you evaluate this decision?

30.AWS Lambda cold starts are increasing customer complaints. A customer shows you their function takes 8 seconds to start but only 200ms to execute. Estimate how much this costs Amazon annually in compute waste.