Senior Front End Engineer Interview Questions and Answers

Pipes are used to transform data in templates, while directives are used to manipulate the DOM.

• Pipes are used to format data in templates, such as date formatting or currency conversion.

• Directives are used to add behavior to DOM elements, like hiding or showing elements based on conditions.

• Example: Using a pipe to format a date in a template: {{ currentDate | date }}

• Example: Using a directive to show/hide an element based on a condition:

System design for a URL shortener webapp

• Use a database to store original URLs and their corresponding short URLs

• Implement a service to generate unique short URLs

• Consider scalability and performance when designing the system

• Include analytics to track usage and performance of the shortener service

I chose HubSpot for its user-friendly interface, robust features, and excellent customer support.

• User-friendly interface makes it easy to navigate and use

• Robust features such as marketing automation, CRM, and analytics

• Excellent customer support ensures any issues are quickly resolved

AoT (Ahead of Time) compilation is done before the program runs, while JIT (Just in Time) compilation is done during runtime.

• AoT compiles the code before execution, resulting in faster startup time.

• JIT compiles the code during runtime, optimizing performance based on actual usage.

• AoT is commonly used in languages like Java and C++, while JIT is used in languages like JavaScript and Python.