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Osttra Interview Questions and Answers
6 Interview questions
Callbacks run first before promises in JavaScript.
Callbacks are executed immediately when they are defined.
Promises are executed asynchronously, after the current call stack is empty.
Example: Callback function passed to setTimeout() runs before the promise resolves.
Singleton in Angular can be achieved by creating a service with providedIn: 'root' in the @Injectable decorator.
Create a service with providedIn: 'root' in the @Injectable decorator
Use the service throughout the application to ensure only one instance is created
Find the longest substring without repeating characters in a given string.
Use a sliding window approach to iterate through the string and keep track of the characters seen so far.
Update the start index of the window when a repeating character is encountered.
Keep track of the longest substring length and characters seen in a hashmap.
Yes, I presented a POC for a new feature in our company's software platform.
I conducted research to identify the need for the new feature
I developed a prototype to demonstrate the functionality of the feature
I presented the POC to stakeholders for feedback and approval
Java is a programming language used to create software applications. It has various datatypes and methods, and requires JDK and JVM.
Java is an object-oriented programming language
Datatypes include int, double, boolean, etc.
Methods are functions that perform specific tasks
JDK (Java Development Kit) is a software development environment
JVM (Java Virtual Machine) is a runtime environment
Example: int x = 5; System.out...
RXJS subject is a generic observable while behavior subject has an initial value and replays it to new subscribers.
RXJS subject is a generic observable that can emit multiple values to multiple subscribers.
Behavior subject is a type of subject that requires an initial value and replays it to new subscribers.
Behavior subject is useful for scenarios where you always want new subscribers to get the most recent value.
...
Osttra Interview Experiences
13 interviews found
Anonymous
I appeared for an interview in Dec 2024.
(5 Questions)
- Q1. Css Position, Display properties, flex box.
- Q2. Event Loop in JS.
- Ans.
Event Loop in JS manages asynchronous operations by executing callback functions in a queue.
Event Loop is a mechanism in JavaScript that allows asynchronous operations to be handled efficiently.
It continuously checks the call stack for any functions to execute, and the callback queue for any functions to be pushed onto the call stack.
Example: setTimeout() function in JS uses the Event Loop to execute a callback functio...
- Q3. Promise and callbacks, tell the sequence which runs first.
- Q4. RXJS subject and behavior subject difference.
- Ans.
RXJS subject is a generic observable while behavior subject has an initial value and replays it to new subscribers.
RXJS subject is a generic observable that can emit multiple values to multiple subscribers.
Behavior subject is a type of subject that requires an initial value and replays it to new subscribers.
Behavior subject is useful for scenarios where you always want new subscribers to get the most recent value.
Examp...
- Q5. How to achieve singleton in angular.
Selected
I appeared for an interview in Aug 2024.
(2 Questions)
- Q1. IT Service Desk related questions
- Q2. Microsoft Entra ID and Google Workspace questions
(2 Questions)
- Q1. ITSM questions and service delivery
- Q2. Question related to work experience
I applied via Recruitment Consulltant and was interviewed in Mar 2024. There was 1 interview round.
(5 Questions)
- Q1. Interview started with an introduction then Technical person shared a link wherein 1 programming question on String- find longest non repeating substring need to be find and 20 MCQs on Java, DS Algo, AWS w...
- Q2. Longest Substring without repeating character
- Ans.
Find the longest substring without repeating characters in a given string.
Use a sliding window approach to iterate through the string and keep track of the characters seen so far.
Update the start index of the window when a repeating character is encountered.
Keep track of the longest substring length and characters seen in a hashmap.
- Q3. Core Java fundmentals
- Q4. AWS ECS, CLoudWatch
- Q5. Hibernate, SQL coding questions
Interview Preparation Tips
- Data Structures
- Java
Skills evaluated in this interview
(1 Question)
- Q1. ELB, S3 types, terraform debugging questions, scenario based aws questions
(1 Question)
- Q1. Terraform, git, aws
Selected
Aptitute based questions
(1 Question)
- Q1. Java and aws based
I applied via Approached by Company and was interviewed in Oct 2023. There were 6 interview rounds.
(1 Question)
- Q1. This was a virtual round where 3easy DSA questions were asked and then java theoretical MCQs with some deep dive into explainations.
(2 Questions)
- Q1. This was an in-office round with questions from DSA, Java and SQL. Questions from many areas are asked with sometimes going deep into a topic. If you are solid with your concepts then it should be fine.
- Q2. Some of the questions I can remember were in the areas of multithreading, OOPs concepts SOLID principles, design patterns. Method overriding/overloading. Stream api.
(2 Questions)
- Q1. This round had some design and managerial questions. Design a to-do list with DB and api details.
- Q2. Any instances in your organization where you presented a POC?
- Ans.
Yes, I presented a POC for a new feature in our company's software platform.
I conducted research to identify the need for the new feature
I developed a prototype to demonstrate the functionality of the feature
I presented the POC to stakeholders for feedback and approval
(1 Question)
- Q1. This was just a simple discussion where some details about the organisation were given. You can ask your own questions.
(1 Question)
- Q1. After you successfully clear the rounds, they will ask you to share payslips and related documents. After sharing documents they will call you 2-3 days later for negotiation. They go through your documents...
Interview Preparation Tips
The technical round thoroughly goes through many areas of a topic, so make sure you understand the concepts well.
Little bit of DSA should be good.
I applied via Recruitment Consulltant and was interviewed in Dec 2023. There were 2 interview rounds.
(1 Question)
- Q1. What are you looking for in the next company/opportunity?
(1 Question)
- Q1. Difficult situation you handled?
Selected
(2 Questions)
- Q1. Go through your resume and tell me about yourself
- Q2. Topics for reg reporting basic questions
Interview Preparation Tips
(1 Question)
- Q1. Implement cache
- Ans.
Implementing a cache involves storing frequently accessed data for quick retrieval, improving performance and efficiency.
Use a data structure like a dictionary or hash map for O(1) access time.
Implement cache eviction policies like LRU (Least Recently Used) to manage memory.
Consider thread safety if the cache will be accessed by multiple threads.
Example: A simple in-memory cache can be implemented using a Python dictio...
Pawan Kumar
Selected
I appeared for an interview in Jun 2023, where I was asked the following questions.
- Q1. Bdd cucumber related
- Q2. Core java with serenity
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