Atos Senior Software Engineer Interview Questions and Answers

Q1. What is the design of the microservices implemented in your current project?
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Q2. Can you provide a program that prints the second largest number in both an array and a list, illustrating implementations using streams as well as traditional methods?
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Fundamentals of Data Structures and Algorithms, including SQL.

Q1. Basics of DSA and Algo and sql
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Q2. Basics
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Q1. Details on previus project
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Q2. B
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Q1. Basics of DSA and algo ..sql
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Q1. List down Java 8 features and use case
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Java 8 introduced several new features including lambda expressions, streams, and functional interfaces.
• Lambda expressions: Allow for more concise and readable code by enabling functional programming.

• Streams: Provide a way to work with collections of objects in a more functional style.

• Functional interfaces: Interfaces with a single abstract method, used to enable lambda expressions.

• Optional class: Helps to avoid null p...read more
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Q2. List down Spring boot annotation used
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Spring boot annotations are used to simplify the development process by providing metadata to the Spring framework.
• 1. @SpringBootApplication - Main annotation to indicate the main class of a Spring Boot application.

• 2. @RestController - Annotation for RESTful web services.

• 3. @Autowired - Dependency injection annotation.

• 4. @GetMapping, @PostMapping, @PutMapping, @DeleteMapping - Annotations for mapping HTTP requests to c...read more
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Q3. Difference between String builder and String Buffer
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String Builder is not synchronized and faster, while String Buffer is synchronized and slower.
• String Builder is not thread-safe, while String Buffer is thread-safe.

• String Builder is faster due to lack of synchronization, while String Buffer is slower due to synchronization.

• String Builder is recommended for single-threaded operations, while String Buffer is recommended for multi-threaded operations.
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Q4. What is String pool
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String pool is a storage area in memory where strings are stored to optimize memory usage by reusing common strings.
• String pool helps in reducing memory usage by storing only one copy of each unique string.

• Strings created using double quotes are stored in the string pool.

• Strings created using new keyword are not stored in the string pool.
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Q5. Number of memory type have. like heap memory , stack
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There are two main types of memory in a computer system: stack memory and heap memory.
• Stack memory is used for static memory allocation and is managed by the compiler. It is typically faster but limited in size.

• Heap memory is used for dynamic memory allocation and is managed by the programmer. It is slower but has a larger size.

• Examples: C programming language uses stack memory for function calls and heap memory for dy
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Q1. What is the SQL query to find the second highest rank in a dataset?
Ans. 
Use a subquery to find the second highest rank in a dataset.
• Use a subquery to select the maximum rank from the dataset.

• Then use another subquery to select the maximum rank that is less than the maximum rank found in the first subquery.
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Q2. What is a program to determine whether a number is odd or even?
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A simple program using modulo operator to determine if a number is odd or even.
• Use the modulo operator (%) to check if the number divided by 2 leaves a remainder

• If the remainder is 0, the number is even. If the remainder is 1, the number is odd

• Example: num % 2 == 0 (even), num % 2 == 1 (odd)
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Q1. Difference between Interface and Abstraction
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Interface defines a contract for a class to implement while Abstraction hides the implementation details.
• Interface is a blueprint of a class that defines what methods a class must implement.

• Abstraction is a concept where only relevant information is shown and irrelevant details are hidden.

• Interfaces can have multiple inheritance while Abstraction can be achieved through abstract classes or interfaces.

• Example: Interface...read more
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Q2. How data flows from frontend to backend in Asp.net core
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Data flows from frontend to backend in Asp.net core through HTTP requests and responses.
• Frontend sends HTTP requests to backend API endpoints

• Backend processes the requests and sends back HTTP responses

• Data can be passed in the request body, query parameters, or headers

• Example: Frontend sends a POST request to create a new user, backend receives the request, processes it, and sends a success response
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Q3. Functions vs Stored Procedure
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Functions are reusable code blocks that return a value, while stored procedures are precompiled SQL statements that can perform multiple operations.
• Functions return a value, while stored procedures do not necessarily return a value.

• Functions can be used in SQL queries, while stored procedures are called using EXECUTE statement.

• Functions are easier to test and debug compared to stored procedures.

• Stored procedures can co...read more
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Q1. More questions on interfaces
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Q2. Comparator related questions
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Q1. Stream api coding questins
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Q2. Database questions
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