Avalara Technologies Sdet Interview Questions and Answers

Q1. Explain framework used for selenium
Ans. 
Selenium is an open-source automation testing framework used for web applications.
• Selenium supports multiple programming languages like Java, Python, C#, etc.

• It consists of Selenium WebDriver, Selenium IDE, and Selenium Grid.

• Selenium WebDriver is used for automating web applications by interacting with the web elements.

• Selenium IDE is a record and playback tool for creating test cases.

• Selenium Grid is used for parallel...read more
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Q2. Checked and unchecked exceptions.
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Checked exceptions are checked at compile time, while unchecked exceptions are not.
• Checked exceptions must be either caught or declared in the method signature using 'throws' keyword.

• Unchecked exceptions do not need to be explicitly handled.

• Examples of checked exceptions include IOException, ClassNotFoundException.

• Examples of unchecked exceptions include NullPointerException, ArrayIndexOutOfBoundsException.
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Q3. Exceptions in selenium
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Exceptions in Selenium are errors that occur during test execution, such as ElementNotVisibleException or TimeoutException.
• Selenium WebDriver throws exceptions when it encounters errors during test execution.

• Common exceptions include NoSuchElementException, ElementNotVisibleException, TimeoutException, StaleElementReferenceException, and WebDriverException.

• Handling exceptions in Selenium can be done using try-catch blo...read more
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Q4. Waits in selenium
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Waits in Selenium are used to synchronize tests with the browser's state.
• Waits help to handle synchronization issues in Selenium tests

• There are two types of waits in Selenium - Implicit Wait and Explicit Wait

• Implicit Wait sets a default waiting time for the entire test script

• Explicit Wait allows the test to wait for a certain condition to be met before proceeding
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Q5. Frames handling
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Q1. Reverse String without using loop
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Reverse string without using loop
• Use recursion to reverse the string

• Base case: if string length is 0 or 1, return the string

• Recursive case: return the last character + reverse(rest of the string)
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Q2. Parenthesis Balancing using stack
Ans. 
Implement a parenthesis balancing algorithm using a stack
• Use a stack to keep track of opening parentheses

• When encountering a closing parenthesis, pop from stack and check if it matches the closing parenthesis

• If stack is empty or mismatched parentheses, return false

• If all parentheses are balanced, return true
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Q1. Function declaration reverse word in a string copy array without direct assignment equality operator vs strict equal post vs put success code of patch what is 403 status code
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Q1. Project related questions only and basic question
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Q1. Ctc discussion, expected ctc and doj
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Tha aptitude exam was not very easy and not that difficult. It was something which one can easily get into.

Q1. Question related to 1. Servers 2. Coding practices 3. Database queries 4. Latest versions syntax
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Q1. Windows internals
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Q2. Windows apis like loaddll dynamically
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Q3. IPC mechanism in windows
Ans. 
IPC mechanism in Windows allows communication between processes through shared memory, message passing, and synchronization.
• IPC mechanisms in Windows include named pipes, mailslots, shared memory, and sockets.

• Named pipes allow communication between processes on the same machine or over a network.

• Mailslots are used for one-way interprocess communication.

• Shared memory allows processes to share data by mapping a region of...read more
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Q4. Multi-threading in windows
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Multi-threading in Windows allows multiple threads to run concurrently within a single process.
• Windows provides APIs like CreateThread and CreateProcess to create and manage threads.

• Threads share the same memory space within a process, allowing for efficient communication and resource sharing.

• Windows supports both user-mode and kernel-mode threads, with user-mode threads being more lightweight.

• Synchronization mechanism...read more
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Q5. C++ general questions
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Q1. Memory management
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Q2. Memory mapping in windows, file mapping
Ans. 
Memory mapping in Windows allows files to be mapped directly into memory for faster access and manipulation.
• Memory mapping allows files to be accessed as if they were in memory

• File mapping can be used for sharing data between processes

• Improves performance by reducing disk I/O operations

• Examples: CreateFileMapping, MapViewOfFile, UnmapViewOfFile
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Q3. Windows internal
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Q4. Critical section in windows
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Critical section in Windows is a synchronization mechanism used to protect shared resources from concurrent access.
• Critical sections are used to ensure mutual exclusion between threads accessing shared resources.

• They are implemented using the Windows API functions InitializeCriticalSection, EnterCriticalSection, and LeaveCriticalSection.

• Critical sections are more efficient than mutexes for synchronization within a sing...read more
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It was online , evryone cheated , and even solving all the questions wont get you shortlisted

Q1. Dynamic memory allocation in c
Ans. 
Dynamic memory allocation in C allows for allocating memory at runtime, enabling flexibility in memory usage.
• Use functions like malloc(), calloc(), and realloc() to dynamically allocate memory in C.

• Remember to free the allocated memory using free() to prevent memory leaks.

• Dynamic memory allocation is commonly used for creating arrays or structures of unknown size at compile time.
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Q2. Reverse linked list
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Product array itself

Parking lot design system design in java