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OneCard Backend Developer Interview Questions and Answers

Updated 21 Dec 2023

OneCard Backend Developer Interview Experiences

1 interview found

Interview experience
1
Bad
Difficulty level
Easy
Process Duration
Less than 2 weeks
Result
No response

I applied via LinkedIn and was interviewed in Nov 2023. There were 4 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all tips
Round 2 - Coding Test 

Hackerearth Coding Test

Round 3 - Technical 

(2 Questions)

  • Q1. Technical Round with Senior Software Engineer around Java, DSA and APIs
  • Q2. 1. Check Valid Parenthesis, 2. Given a problem design your own API and suitable URL for it Discussions about implementation and designing of the above two questions
Round 4 - One-on-one 

(2 Questions)

  • Q1. One-on-one round with Project manager
  • Q2. Architecture and System design round, but interviewer given me Java Coding , some basic question and asked some questions on SQL then in the middle of the interview he told that we are not going forward wi...

Interview Preparation Tips

Topics to prepare for OneCard Backend Developer interview:
  • Data Structures
  • Algorithms
  • REST API
  • Java
  • Database
Interview preparation tips for other job seekers - Please the availability of the interviewers first then schedule a call. Candidates really do hard work and reach for the final interviews hoping to have atleast a proper interview. If anyone is already selected for the role, don't schedule an interview at all. Even did not received any updates yet.

Interview questions from similar companies

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Approached by Company and was interviewed in Jul 2024. There were 4 interview rounds.

Round 1 - Aptitude Test 

The first round is an aptitude assessment that consists of coding questions focused on dynamic programming, as well as medium to hard level aptitude and reasoning questions.

Round 2 - Coding Test 

The second round focuses on coding and consists of data structure and algorithm questions related to arrays, linked lists, basic Java concepts, strings, and project-based questions from the resume.

Round 3 - Coding Test 

The third round also consists of coding, which includes challenging data structures and algorithms questions based on graphs, trees, multithreading, and difficult SQL-based questions.

Round 4 - HR 

(2 Questions)

  • Q1. What are your short-term and long-term goals?
  • Ans. 

    My short-term goal is to enhance my skills in backend development and contribute effectively to the team. My long-term goal is to become a lead developer and work on innovative projects.

    • Short-term goal: Improve backend development skills

    • Short-term goal: Contribute effectively to the team

    • Long-term goal: Become a lead developer

    • Long-term goal: Work on innovative projects

  • Answered by AI
  • Q2. How do you approach solving a large problem within a limited timeframe?
  • Ans. 

    I break down the problem into smaller tasks, prioritize them, and focus on the most critical aspects first.

    • Break down the problem into smaller, more manageable tasks

    • Prioritize tasks based on importance and impact

    • Focus on critical aspects first to ensure progress

    • Regularly reassess and adjust the plan as needed

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - Prepare thoroughly, study data structures and algorithms as well as SQL, use your time wisely, think critically, remain calm, and take your time.
Interview experience
5
Excellent
Difficulty level
Hard
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Referral and was interviewed before Jul 2022. There were 3 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all tips
Round 2 - Technical 

(2 Questions)

  • Q1. Microservices architecture
  • Q2. High scale system design
  • Ans. 

    Designing high scale systems involves careful planning for scalability, reliability, and performance.

    • Identify the key components of the system and their interactions

    • Use distributed systems and microservices architecture for scalability

    • Implement caching mechanisms to improve performance

    • Utilize load balancing and horizontal scaling to handle increased traffic

    • Monitor system performance and implement auto-scaling mechanism

  • Answered by AI
Round 3 - Coding Test 

Optimise SQL queries to transmit large datasets and check for resiliency

Interview Preparation Tips

Interview preparation tips for other job seekers - Strong technical skills and good communication is a must

Skills evaluated in this interview

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

I was interviewed before Jun 2023.

Round 1 - One-on-one 

(1 Question)

  • Q1. Write a program to read a file
  • Ans. 

    Program to read a file in backend development

    • Use a programming language like Python, Java, or C++ to open and read the file

    • Use file handling functions to read the contents of the file

    • Handle exceptions for file not found or permission issues

    • Close the file after reading to free up system resources

  • Answered by AI
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

I applied via Naukri.com and was interviewed in Mar 2024. There was 1 interview round.

Round 1 - Coding Test 

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Interview Preparation Tips

Topics to prepare for Paytm Backend Developer interview:
  • DSA
  • Core java
  • Design Patterns
  • Spring Boot
Interview preparation tips for other job seekers - DSA , Design Patters , Core Java Concepts , Springboot
Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. Java threads concepts and its usage
  • Q2. Data structures problems and design quentions
Interview experience
3
Average
Difficulty level
-
Process Duration
-
Result
Not Selected

I applied via Instahyre and was interviewed in Nov 2024. There was 1 interview round.

Round 1 - Coding Test 

Machine Coding round on codesignal

Interview experience
3
Average
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

It was a machine coding round which revolves around designing a simple application primarily on OOPS

Round 2 - DSA 

(2 Questions)

  • Q1. Best time to sell stocks
  • Ans. 

    The best time to sell stocks is when the market is high and the stock has reached its peak value.

    • Sell when the stock has reached its peak value to maximize profits

    • Consider selling if the company's fundamentals have changed negatively

    • Sell if you need to rebalance your portfolio or have reached your financial goals

  • Answered by AI
  • Q2. Best time to sell stocks 2
  • Ans. 

    The best time to sell stocks is when the market is at a peak and the stock price is high.

    • Monitor market trends and stock performance regularly.

    • Consider selling when the stock reaches a new high or when you have achieved your profit goals.

    • Sell if there are negative news or events that could impact the stock price negatively.

  • Answered by AI

I applied via LinkedIn and was interviewed in Apr 2021. There were 4 interview rounds.

Interview Questionnaire 

4 Questions

  • Q1. 1. Mininum cost to reach the last cell of a 2D matrix. Required moves are only downward or to the right direction
  • Ans. 

    Minimum cost to reach last cell of 2D matrix with only downward or right moves.

    • Use dynamic programming approach to solve the problem.

    • Calculate minimum cost for each cell by considering minimum cost of its adjacent cells.

    • Final answer will be the minimum cost to reach the last cell.

  • Answered by AI
  • Q2. Design a Stack that can support getMin functionality. Whenever it calls getMin on stack it should return the min element in the stack.
  • Ans. 

    Design a stack that supports getMin functionality to return the minimum element in the stack.

    • Create two stacks, one for storing the actual elements and another for storing the minimum elements.

    • Push elements onto both stacks simultaneously.

    • When popping an element, pop from both stacks.

    • To get the minimum element, peek at the top of the minimum stack.

  • Answered by AI
  • Q3. Design a TreeSet functionality
  • Ans. 

    TreeSet is a data structure that stores unique elements in sorted order.

    • TreeSet is implemented using a Red-Black tree

    • It provides O(log n) time complexity for basic operations like add, remove, and contains

    • It also provides methods like first(), last(), headSet(), tailSet(), and subSet()

    • TreeSet can be used to implement priority queues and sorting algorithms

  • Answered by AI
  • Q4. Design a ArrayList that supprorts all the existing funtions of a list plus getMax functionality also.
  • Ans. 

    Design an ArrayList with getMax functionality.

    • Create a custom ArrayList class that extends the existing ArrayList class.

    • Add a getMax() method that returns the maximum value in the list.

    • Override the add() method to keep track of the maximum value in the list.

    • Update the maximum value whenever an element is added or removed from the list.

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - Practice Data Structures and algorithms. If you have industry experience you will be asked system design questions as well, migh as well prepare for that

Skills evaluated in this interview

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Naukri.com and was interviewed before Oct 2023. There were 2 interview rounds.

Round 1 - Technical 

(2 Questions)

  • Q1. Basic questions about projects
  • Q2. Design a get api .
  • Ans. 

    Design a GET API to retrieve user information.

    • Define the endpoint for the API (e.g. /users/:id)

    • Include query parameters for filtering (e.g. /users?role=admin)

    • Return user data in JSON format

    • Handle errors gracefully (e.g. return 404 if user not found)

  • Answered by AI
Round 2 - Technical 

(2 Questions)

  • Q1. Similar to first round based on project i have worked on my previous company.
  • Q2. Write a post APi
  • Ans. 

    To create a post API for a backend system

    • Define the endpoint for the API (e.g. /posts)

    • Set up the HTTP method (e.g. POST)

    • Handle the request data and process it accordingly

    • Implement the necessary validation and error handling

    • Return a response with the appropriate status code and data

  • Answered by AI

Skills evaluated in this interview

OneCard Interview FAQs

How many rounds are there in OneCard Backend Developer interview?
OneCard interview process usually has 4 rounds. The most common rounds in the OneCard interview process are Resume Shortlist, Coding Test and Technical.
How to prepare for OneCard Backend Developer interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at OneCard. The most common topics and skills that interviewers at OneCard expect are AWS, Algorithms, Backend, Data Structures and Design Patterns.
What are the top questions asked in OneCard Backend Developer interview?

Some of the top questions asked at the OneCard Backend Developer interview -

  1. Architecture and System design round, but interviewer given me Java Coding , so...read more
  2. 1. Check Valid Parenthesis, 2. Given a problem design your own API and suitable...read more
  3. Technical Round with Senior Software Engineer around Java, DSA and A...read more

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OneCard Backend Developer Interview Process

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