Infosys Senior Systems Engineer Interview Questions and Answers

A code snippet to demonstrate a simple array manipulation in Python.

• Use lists in Python to create an array-like structure.

• Example: my_array = [1, 2, 3, 4] to initialize an array.

• You can append items using my_array.append(5).

• Access elements using indexing: first_element = my_array[0].

• Use list comprehensions for transformations: squared = [x**2 for x in my_array].

Remove duplicates from a string while preserving the original order of characters.

• Use a set to track seen characters and a list to build the result. Example: 'banana' -> 'ban'.

• Iterate through the string, adding characters to the result if they haven't been seen. Example: 'apple' -> 'aple'.

• Consider edge cases like empty strings or strings with all duplicates. Example: '' -> ''.

• Return the result as a new st...read more

Thymeleaf is a modern server-side Java template engine for web and standalone environments, designed for processing and creating HTML, XML, and more.

• Thymeleaf integrates seamlessly with Spring Framework, making it a popular choice for Spring MVC applications.

• It allows for natural templating, meaning templates can be opened and edited in a browser without needing to be processed by the server.

• Thymeleaf supports var...read more

Swagger is an open-source framework for designing, building, and documenting RESTful APIs.

• Swagger provides a user-friendly interface for API documentation.

• It uses a standard format (OpenAPI Specification) to describe APIs.

• Developers can generate client libraries and server stubs from Swagger definitions.

• Example: A Swagger UI can display endpoints for a weather API, showing methods like GET /weather.

• Swagger allows ...read more

OOP (Object-Oriented Programming) is a programming paradigm based on objects and classes to structure software design.

• Encapsulation: Bundling data and methods that operate on the data within one unit (e.g., a class).

• Inheritance: Mechanism to create a new class using properties and methods of an existing class (e.g., a 'Dog' class inheriting from an 'Animal' class).

• Polymorphism: Ability to present the same interfac...read more

Language is a structured system of communication using symbols, sounds, or gestures to convey meaning.

• Language can be spoken, written, or signed, such as English, Spanish, or American Sign Language.

• It consists of grammar, vocabulary, and syntax that govern how words are combined.

• Language evolves over time, adapting to cultural and societal changes, like the emergence of slang.

• It serves various functions, including...read more

In Python, an index refers to the position of an element in a sequence like a list or string.

• Indexes in Python are zero-based, meaning the first element is at index 0.

• For example, in the list `my_list = [10, 20, 30]`, `my_list[0]` returns 10.

• Negative indexing allows access from the end, e.g., `my_list[-1]` returns 30.

• Strings are also indexed; for instance, `my_string = 'hello'`, `my_string[1]` returns 'e'.

• Attempti...read more

Assess the situation, gather information, and implement a rollback to restore system functionality quickly.

• Assess the impact: Determine which systems are affected and the severity of the crash.

• Gather logs: Check system logs and error messages to identify what changes caused the crash.

• Communicate: Inform stakeholders about the issue and the steps being taken to resolve it.

• Rollback changes: If possible, revert to th...read more