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system design
Hard
Verified Question
#1
1. Top 6 Recently Asked Uber System Design Questions
Category: Graph system design problemThis collection covers the most frequently asked system design questions at Uber interviews.Input: Graph (nodes and edges)
Output: Computed result
system design
Senior
test automation
#1
1. [OA] Test Result Aggregator — design a scalable aggregator for test results
As Uber scales its testing infrastructure, it's essential to have a robust mechanism that can efficiently aggregate results from various automated tests, analyze performance, and report statistics.
Your challenge is to design a
Example 1:
Input:
Output:
Explanation: The result is stored in the aggregator.Example 2:
Input:
Output:
Explanation: Returns the aggregated statistics from previously added results.Constraints:
Your challenge is to design a
TestResultAggregator class that consolidates test results.- Method 1:
void addResult(TestResult result)— Accepts a test result and adds it to the internal storage. - Method 2:
Statistics getStatistics()— Returns aggregated statistics (e.g., pass rate, average execution time).
Example 1:
Input:
addResult(testResult)Output:
voidExplanation: The result is stored in the aggregator.Example 2:
Input:
getStatistics()Output:
StatisticsExplanation: Returns the aggregated statistics from previously added results.Constraints:
- The number of test results will not exceed
10000.
system design
Senior
caching
#2
2. [OA] LRU Cache — design the caching layer for Uber’s API responses
As Uber's service scales globally, efficient caching mechanisms become essential for optimizing API performance and reducing latency. Your challenge is to implement an LRU Cache to handle frequently accessed API responses.
Example 1:
Input:
Output:
Explanation: The data for
Input:
Output:
Explanation: The function returns the cached data for
- Method 1:
void put(String key, Value value)— Stores a value in the cache with the associated key. - Method 2:
Value get(String key)— Retrieves the value for the key and refreshes its access order.
Example 1:
Input:
put('user_1', data)Output:
voidExplanation: The data for
user_1 is stored in the cache.Example 2:Input:
get('user_1')Output:
dataExplanation: The function returns the cached data for
user_1.Constraints:- The capacity of the cache is defined as
N, with a maximum value of1000.
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