UBS interview questions
Online test → Technical → HR·85% entry level
CS fundamentals
Showing 32 of 99 reported in this area
Predict the output of given Java code snippets.
Explain the different types of inheritance in Object-Oriented Programming.
Answer conceptual questions on DBMS
Explain B+ trees and indexing in databases
Explain what PL/SQL is and write a trigger.
How is JSX compiled and converted into JavaScript?
Explain OS concepts such as Paging and Segmentation
How do you find the 3rd highest salary in a database?
Explain client-side rendering vs server-side rendering
Explain what happens internally when you run a program
How do you store and manage images in a web application?
Explain inner classes, threads, and synchronization in Java.
How can you ensure data security while using cloud services?
Write an SQL query to find the highest salary department-wise
Are you familiar with PL/SQL? Write a trigger and explain its use.
What happens if an exception occurs in code and it is not handled?
Design classes and implement constructors to satisfy given test cases.
Explain database normalization and the difference between 3NF and BCNF
Explain differences in architecture between popular backend frameworks
Explain DBMS concepts including Normalization, Joins, and ACID properties
Give real-life examples explaining the pillars of Object-Oriented Programming.
Explain garbage collection in Java and how memory is freed if an exception occurs.
Given a C++ OOP code snippet, predict the output and explain which constructors are called
Which is better: an abstract class with all abstract methods or an interface? Explain why.
Explain method overriding in Java, including what happens if a base class method is private.
Explain why the String class in Java is immutable and demonstrate how to create an immutable class.
Given multiple database tables, perform JOIN operations to derive the desired output for specific test case scenarios.
Write an SQL query to display the author and the number of books written by them from a table having multivalued attributes.
Explain JavaScript closures and predict the output of a function using closures (e.g., function ex(temp) { return [temp]; }).
Explain the String class in Java and discuss collections like HashMap and Hashtable, including differences between HashMap and Hashtable.
Compare C++ and Java
Explain the core OOP concepts in Java
DSA
Showing 18 of 40 reported in this area
Find the length of the longest substring with at most K normal characters.
Write code related to linked lists
Optimize the performance of a given method
Given a sequence of words, print all anagrams together
Reverse a string using recursion without using any auxiliary memory
Reverse a substring in a given string only if the substring exactly matches; otherwise return an error
Given a linked list where the number of nodes is unknown, solve the problem using a pointer-based solution in one pass
Given a string and a vector of strings, find the lexicographically smallest string that can be formed by rearranging the characters of the given string.
Given a string and a vector of strings, find the lexicographically smallest string that can be created by rearranging the characters of the given string.
Given a string s, remove duplicate letters so that every letter appears once and the resulting string is the smallest in lexicographical order among all possible results.
Given a movement string consisting of 'C' (clockwise), 'A' (anticlockwise), and '?' (unknown), determine the maximum possible displacement from the origin by replacing '?' optimally.
Given an array where each element represents the time taken by a task, allocate tasks to n persons such that each person gets nearly equal total work. Tasks must be assigned in sequence.
Given a string consisting of characters 'A', 'C', and '?', where 'A' means anti-clockwise move, 'C' means clockwise move, and '?' can be replaced by either 'A' or 'C', determine how to replace '?' to achieve the maximum distance from the initial position after traversing the entire string.
Matrix Traversal: Given a 4x4 matrix with initial energy 100, start from any cell in the first row and move to (i+1,j-1), (i+1,j), or (i+1,j+1) in each step until the last row. Energy decreases by the value of each visited cell. Find the maximum possible energy left at the end (energy can be negative).
Count the minimum number of fountains to be activated to cover the entire garden
Given an array, preprocess it using prefix sums and answer multiple queries efficiently using binary search such that brute-force approaches lead to TLE.
Given an array representing the capacity of each machine, find the maximum network size such that each member in the network is adjacent, satisfies a minimum size, and meets a minimum threshold.
Implement a function to reverse a string
Aptitude
Showing 1 of 8 reported in this area
Quantitative aptitude problem involving clock losing 2 minutes every hour.
Puzzles
Showing 3 of 7 reported in this area
100 Doors Puzzle: There are 100 doors initially closed. After 100 passes toggling doors at multiples, which doors remain open?
Four people with crossing times 1, 2, 7, and 10 need to cross a river with one torch; only two can cross at a time and one must return. Find the minimum total time.
100 prisoners with red/black hats puzzle: Devise a strategy so that the maximum number of prisoners can guess their hat color correctly.
Behavioural
Showing 3 of 5 reported in this area
In a scenario where you are leading a team that is not responding well, how would you handle the situation?
If you were the new employee unfamiliar with the tech stack and facing issues implementing a feature, how would you handle the situation?
As a technical head, how would you handle a situation where a new employee is struggling to implement a feature due to lack of familiarity with the tech stack?
System design
3 questions reported in this area
Design a database schema for an App Store.
Design a RESTful API for a given scenario and explain different HTTP methods
How would you approach building a system to predict a person's mood based on the type of songs they listen to?
Showing 60 of 107 questions. Ranked by how often the same question came back across reports.
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What questions does UBS ask?
Candidate interview reports most often cover CS fundamentals (61%) and DSA (25%).
How many rounds does UBS interview have?
Candidate interview reports show an average of 3.3 rounds per experience, with a typical sequence of Online test → Technical → HR. Individual interview paths can vary.
Is the UBS interview hard?
Among questions with a reported difficulty, the mix is easy 50%, medium 45%, hard 5%.