Qualitest Interview Questions and Answers

An application can be scaled to cater to a wider audience by implementing load balancing, caching, database optimization, and microservices architecture.

• Implement load balancing to distribute incoming traffic across multiple servers to prevent overload on any single server.

• Utilize caching to store frequently accessed data in memory for faster retrieval and reduced load on the database.

• Optimize the database by indexing frequently queried fields, partitioning tables, and using ...read more

Designing a payment processing system involves creating a secure and efficient platform for handling financial transactions.

• Implement secure encryption methods to protect sensitive data

• Utilize tokenization to replace card information with a unique identifier

• Integrate with payment gateways like PayPal or Stripe for processing transactions

• Include fraud detection mechanisms to prevent unauthorized transactions

Waterfall model is a linear sequential approach to software development, while Agile is an iterative and incremental approach.

• Waterfall model follows a sequential process where each phase must be completed before moving on to the next.

• Agile is flexible and allows for changes to be made throughout the development process.

• Waterfall model is best suited for projects with well-defined requirements, while Agile is better for projects with evolving requirements.

• Agile promotes colla...read more

To send a POST request in Python, use the requests library.

• Import the requests library

• Use the requests.post() method with the URL and data as parameters

• Handle the response object to get the result

Array List is a dynamic array that can grow or shrink in size, while Array has a fixed size.

• Array List allows for dynamic resizing, while Array has a fixed size set at initialization.

• Array List is more flexible and easier to work with for adding or removing elements.

• Array has better performance for random access due to contiguous memory allocation.

• Example: ArrayList list = new ArrayList<>(); String[] array = new String[5];

The -sub parameter in CloudFormation creates a new stack with the specified name, while the -ref parameter references an existing resource in the same stack.

• The -sub parameter is used to create a new stack with a specified name.

• The -ref parameter is used to reference an existing resource within the same stack.

• For example, you can use -sub to create a new VPC stack, and then use -ref to reference the VPC resource in another stack.

Terraform state file is a file that stores the state of your infrastructure managed by Terraform.

• It keeps track of the resources created by Terraform and their current state

• It is used to plan and apply changes to the infrastructure

• It can be stored locally or remotely in a backend like AWS S3 or Terraform Cloud