Ola Electric Mobility SDE (Software Development Engineer) Interview Questions and Answers

I was asked about Rust and it's nuances: How the memory management model works, and then asked to write a program to read and write files to disk, as well as accept command line arguments using Rust's standard library.

Q1. How do you work on code that someone else has written?
Ans. 
I review the code thoroughly, understand its functionality, and make necessary changes while following coding standards.
• Review the code to understand its functionality

• Follow coding standards and best practices

• Make necessary changes while ensuring code quality

• Communicate with the original author if needed
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Q2. How do you debug and solve problems that might've gotten missed during Unit Testing after they've been presented by QA?
Ans. 
I use a combination of debugging tools, logs, code reviews, and collaboration with team members to identify and fix issues.
• Utilize debugging tools such as breakpoints, watchpoints, and step-through debugging to pinpoint the root cause of the issue.

• Analyze logs and error messages to gather more information about the problem.

• Review the code changes made since the last successful unit test to identify potential causes of ...read more
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Q3. How do you improve the performance/memory footprint of your Rust program, without relying on any external crates, profilers, or architectural changes? Assume that logging and monitoring libraries etc. are ...read more
Ans. 
To improve performance/memory footprint of Rust program without external tools, focus on optimizing algorithms, data structures, and memory management.
• Optimize algorithms to reduce time complexity

• Use efficient data structures like HashMaps or Vecs

• Minimize memory allocations by reusing objects or using stack allocation

• Avoid unnecessary copying of data

• Implement lazy evaluation to defer computations until needed
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Q1. Where do you see yourself in 3 years time?
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Q2. Why did you leave your previous organisation after such a short stint?
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Some objective type question, One easy question on string, REsT API design in hackerank

Q1. Most of the questions was from my primary skils, Be prepared with you have mentioned in your resume.
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Q1. Package discussion
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1 hour, 45 questions

Q1. Introduce Yourself?
Ans. 
I am a software developer with 5 years of experience in Java, Python, and SQL.
• 5 years of experience in Java, Python, and SQL

• Strong problem-solving skills

• Experience working in Agile development environment

• Familiar with version control systems like Git

• Passionate about learning new technologies
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Q2. What are your strengths?
Ans. 
My strengths include problem-solving skills, attention to detail, and strong programming abilities.
• Strong problem-solving skills - I am able to analyze complex problems and come up with effective solutions.

• Attention to detail - I pay close attention to the details in my code to ensure accuracy and quality.

• Strong programming abilities - I have a solid understanding of various programming languages and technologies.

• Team ...read more
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Q3. Why should we hire you?
Ans. 
I have a strong background in software development, a passion for learning new technologies, and a proven track record of delivering high-quality code.
• Extensive experience in software development

• Passion for learning new technologies

• Proven track record of delivering high-quality code
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Q1. How hard to do code
Ans. 
Coding can be challenging but rewarding with practice and experience.
• Coding requires problem-solving skills and attention to detail.

• Practice and experience can make coding easier over time.

• Collaborating with others and seeking help when needed can make coding less difficult.

• Using tools and resources effectively can also help in coding efficiently.

• Examples: debugging a complex algorithm, optimizing code for performance,...read more
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Q2. How to acheive deaign patterns
Ans. 
Design patterns can be achieved by understanding common software design problems and implementing reusable solutions.
• Understand common design problems and solutions

• Implement reusable solutions in code

• Use design patterns like Singleton, Factory, Observer, etc.

• Follow best practices and principles like SOLID
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Q3. How ti keep agile
Ans. 
To keep agile, focus on communication, adaptability, collaboration, and continuous improvement.
• Communicate regularly with team members and stakeholders to stay aligned on goals and progress.

• Be willing to adapt to changing requirements and priorities.

• Collaborate closely with team members to share knowledge and expertise.

• Continuously seek feedback and look for ways to improve processes and workflows.
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Q4. How to make redis cache
Ans. 
Redis cache can be created by setting up a Redis server and using Redis commands to store and retrieve data.
• Set up a Redis server on your machine or use a cloud-based Redis service.

• Use Redis commands like SET and GET to store and retrieve data in the cache.

• Set expiration times for keys to control cache eviction policies.

• Monitor cache performance and usage to optimize for efficiency.

• Consider using Redis data structures ...read more
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Q5. How to relive an existing offer
Ans. 
To relive an existing offer, negotiate with the employer for better terms or consider accepting a counteroffer.
• Negotiate with the employer for better salary, benefits, or work conditions

• Consider accepting a counteroffer if it meets your expectations

• Communicate openly and professionally with the employer
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Q1. Introduced about company and it's business, background discussion
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Q2. Salary, appraisal and other policy discussion
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First Round was Aptitude and coding round. It consist 70 question, 30 aptitude question and 40 mcq type coding question

Q1. Find the one repeated number in an array and asked for four approaches
Ans. 
Find the one repeated number in an array using four different approaches.
• Approach 1: Using a hash set to store unique elements and checking for duplicates

• Approach 2: Sorting the array and checking adjacent elements for duplicates

• Approach 3: Using XOR operation to find the repeated number

• Approach 4: Using the sum formula to find the repeated number
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Q2. Simple sql queries
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