PwC

PricewaterhouseCoopers, a multinational professional services network.

4 Rounds ~21 Days Medium

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The Interview Loop

Recruiter Screen (30 min)

Standard fit check, behavioral questions, and resume overview.

Technical Loop (3-4 Rounds)

Deep dive into domain knowledge, coding, and system design.

Interview Question Bank

All Roles Backend Engineer 6 Cloud Engineer 1 Data Engineer 3 Data Scientist 2 DevOps Engineer 2 Full Stack Engineer 7 Machine Learning Engineer 4 Software Engineer 8

All Topics System Design 51 Algorithms 33 SQL 24 Culture Fit 18 JavaScript 10 Leadership 10 Databases 8 ML Theory 8

Backend Engineer • Coding • medium

Find the lowest common ancestor of two nodes in a binary search tree.

#Trees #Binary Search Tree #Recursion

Practice

Backend Engineer • Coding • medium

Given a list of intervals, merge all overlapping intervals.

#Arrays #Sorting

Practice

Backend Engineer • Coding • easy

Given an array of integers, return indices of the two numbers such that they add up to a specific target.

#Arrays #Hash Map

Practice

Backend Engineer • Coding • easy

Write a function to check if a given string containing brackets is valid (properly closed and nested).

#Strings #Stack

Practice

Backend Engineer • Coding • medium

Given an array of strings, group the anagrams together.

#Strings #Hash Map #Sorting

Practice

Backend Engineer • Coding • medium

Given a string, find the length of the longest substring without repeating characters.

#Strings #Sliding Window #Hash Map

Practice

Cloud Engineer • Coding • easy

Given an array of integers representing daily cloud compute costs, write a function to find the maximum cost increase between any two consecutive days.

#Arrays #Logic #FinOps

Practice

Data Engineer • Coding • medium

Given a list of dictionaries representing nested JSON data from a client API, write a Python script to flatten the dictionaries into a single level.

#Python #Recursion #Data Parsing #JSON

Practice

Data Engineer • Coding • easy

Write a Python function to check if a given string is a valid palindrome, ignoring case and all non-alphanumeric characters.

#Python #String Manipulation #Two Pointers

Practice

Data Engineer • Coding • hard

Write a Python generator function to process a massive 50GB log file line by line without loading the entire file into memory, extracting specific error codes.

#Python #Generators #Memory Management #File I/O

Practice

Data Scientist • Coding • easy

Implement a binary search algorithm in Python to find a specific transaction ID in a sorted list of 10 million records.

#Binary Search #Time Complexity #Python

Practice

Data Scientist • Coding • easy

Write a Python function that takes a list of strings representing financial document titles and returns the longest common prefix among them.

#Strings #Arrays #Optimization

Practice

DevOps Engineer • Coding • medium

Write a Python function to parse a large Nginx access log file and return the top 5 IP addresses with the most 404 errors.

#Python #Log Parsing #Data Structures

Practice

DevOps Engineer • Coding • easy

Given an array of integers, write a script to find the two numbers that add up to a specific target. (Two Sum)

#Python #Data Structures

Practice

Full Stack Engineer • Coding • medium

Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element.

#Heap #Sorting #Divide and Conquer

Practice

Full Stack Engineer • Coding • easy

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.

#Arrays #Hash Map

Practice

Full Stack Engineer • Coding • easy

Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.

#Strings #Stack

Practice

Full Stack Engineer • Coding • medium

Given an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals, and return an array of the non-overlapping intervals that cover all the intervals in the input.

#Arrays #Sorting

Practice

Full Stack Engineer • Coding • medium

Design a data structure that follows the constraints of a Least Recently Used (LRU) cache.

#Design #Linked List #Hash Map

Practice

Full Stack Engineer • Coding • medium

Given an array of strings strs, group the anagrams together. You can return the answer in any order.

#Strings #Hash Map

Practice

Full Stack Engineer • Coding • easy

Given the head of a singly linked list, reverse the list, and return the reversed list.

#Linked List

Practice

Machine Learning Engineer • Coding • medium

Write a Python function from scratch to compute the TF-IDF scores for a corpus of text documents without using scikit-learn.

#Python #NLP #Math

Practice

Machine Learning Engineer • Coding • medium

Given an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals, and return an array of the non-overlapping intervals that cover all the intervals in the input. This is often used to consolidate overlapping client transaction windows.

#Arrays #Sorting #Intervals

Practice

Machine Learning Engineer • Coding • hard

Implement the core update step of the K-Means clustering algorithm in Python using NumPy.

#Python #NumPy #Machine Learning

Practice

Machine Learning Engineer • Coding • medium

Given a large list of server log error codes, write a function to find the top K most frequent error codes. Optimize for time complexity.

#Heaps #Hash Maps #Counting

Practice

Software Engineer • Coding • easy