Happiest Minds Technologies Senior Technical Lead Interview Questions and Answers

Using a crypto price API to fetch and display real-time cryptocurrency prices in a machine coding project.

• Utilize a crypto price API to fetch real-time cryptocurrency prices

• Implement error handling for API requests

• Display the fetched prices in a user-friendly format

Microservices are a software development technique where an application is composed of small, independent services that communicate over well-defined APIs.

• Microservices are small, independent services that work together to form an application

• Each microservice is responsible for a specific function or feature

• Microservices communicate with each other over well-defined APIs

• Microservices can be developed, deployed, and sca...read more

Repository design pattern is a structural design pattern that separates the data access logic from the business logic in an application.

• It provides a way to access data from a data source without exposing the underlying data access code to the business logic.

• It helps in achieving separation of concerns by keeping data access code in a separate layer.

• Commonly used in applications where data needs to be accessed from mul

Builder design pattern is a creational design pattern used to construct complex objects step by step.

• Builder pattern separates the construction of a complex object from its representation.

• It allows the same construction process to create different representations of the object.

• Useful when there are multiple ways to construct an object or when the object creation process is complex.

• Example: StringBuilder in Java allows ...read more

JOIN query to retrieve country and employee name

• Use JOIN keyword to combine data from multiple tables

• Specify the columns to select from each table

• Use ON keyword to specify the relationship between the tables