4Life iNNOVATIONS Senior Developer Interview Questions and Answers

Q1. HashMap internal working
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Q1. Java 8 questions
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Q1. Salary discussion
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Q1. Sliding Window find the subarray with sum equal to k
Ans. 
Using sliding window technique to find subarray with sum equal to k.
• Initialize two pointers at the start of the array.

• Move the right pointer to expand the window until the sum is greater than or equal to k.

• Move the left pointer to shrink the window if the sum exceeds k.

• Repeat until the end of the array is reached.

• Example: Input array [1, 4, 20, 3, 10, 5], k=33. Output: [20, 3, 10].
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Q1. Java8 stream API, functional interfaces
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Q2. Collections, spring boot
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Q1. Why you wanto to join tcs?
Ans. 
I want to join TCS because of its reputation for innovation and growth opportunities.
• TCS is known for its cutting-edge technology solutions

• Opportunities for career advancement and skill development

• Global presence and diverse client base
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Q1. Salary discussion
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Q1. Difference between custom setting and custom metadata
Ans. 
Custom settings are org-specific, while custom metadata can be deployed across orgs.
• Custom settings are hierarchical and can be accessed using a hierarchy custom setting type

• Custom metadata is deployable and can be used in managed packages

• Custom settings are stored in the application cache, while custom metadata is stored in the metadata cache
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Q2. Difference between profile and role
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Profile is a summary of a person's skills and experience, while role is the specific job or position they hold within an organization.
• Profile is a broader overview of a person's qualifications and background.

• Role is a specific set of responsibilities and tasks assigned to an individual within a company.

• Profiles can include education, work experience, skills, and achievements.

• Roles can be defined by job titles such as S...read more
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Easy exam sample available on youtube

Q1. What are step functions.
Ans. 
Step functions are a type of serverless function that allow you to create workflows by chaining multiple functions together.
• Step functions are used to coordinate multiple AWS services into serverless workflows.

• They allow you to define a series of steps in a workflow, with each step being a separate function.

• You can use step functions to handle complex business logic, long-running processes, and error handling.

• Step func...read more
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Q2. How to scale lambdas
Ans. 
Scaling lambdas involves optimizing memory usage, increasing concurrency, and managing dependencies.
• Optimize memory usage by reducing unnecessary variables and objects

• Increase concurrency by using asynchronous programming and parallel processing

• Manage dependencies by breaking down functions into smaller, more modular components

• Consider using AWS Lambda Provisioned Concurrency for consistent performance
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Q1. How did you handled a difficult collegelue
Ans. 
I addressed the issue directly and professionally, seeking to understand their perspective and find common ground.
• Approached the colleague privately to discuss the issue

• Listened actively to their concerns and perspective

• Sought to find common ground and reach a resolution

• Maintained professionalism and respect throughout the conversation
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Q1. What is singleton class
Ans. 
A singleton class is a class that can only have one instance created throughout the application.
• Singleton classes are often used for logging, caching, database connections, and thread pools.

• They have a private constructor to prevent multiple instances from being created.

• The class typically provides a static method to access the single instance.
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Q2. What is Method reference
Ans. 
Method reference is a shorthand syntax for lambda expressions to call a method.
• Method reference is used to refer to a method without invoking it.

• It can be used to make code more concise and readable.

• There are four types of method references: static, instance, constructor, and array constructor.
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Q1. Write the code in eggplant
Ans. 
Writing code in eggplant for Senior Developer interview
• Use 'click' to simulate a mouse click on an element

• Use 'typeText' to enter text into a field

• Use 'verify' to check if an element is present on the screen
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Sample code round to implement the weather API

Q1. Discussion about salary package
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