30+ Hidden Brains InfoTech Interview Questions and Answers

Implement an API in Java to fetch top rated movies in a certain genre from an external datasource using pagination.

• Create a REST API endpoint in Java using Spring Boot framework

• Implement pagination by using query parameters for 'page' and 'size'

• Filter the movies by genre and sort them by rating to fetch the top rated ones

• Use a service layer to interact with the external datasource and fetch the data

• Return the filtered and paginated movie data in the response

Find the maximum area of a square in a binary matrix.

• Iterate through the matrix and for each cell, calculate the maximum square area that can be formed with that cell as the top-left corner.

• Use dynamic programming to store the maximum square area at each cell.

• Keep track of the maximum area encountered so far and return it as the result.

Find longest increasing sequence in a matrix

• Iterate through each element in the matrix

• For each element, check its neighbors to find the longest increasing sequence

• Keep track of the longest sequence found so far

Find the index after which a number repetition starts in an infinite array stream.

• Iterate through the array stream and keep track of the numbers encountered.

• Once a number is repeated, return the index of the first occurrence of the repeated number.

• Use a hash set or a dictionary to efficiently check for duplicates.

Find kth smallest element from array without using in-built function

• Sort the array and return the kth element

• Use quickselect algorithm to find kth smallest element in O(n) time

• Implement min heap and extract kth smallest element

I have successfully managed experiences involving strict timelines and deliverables by prioritizing tasks, setting clear goals, and communicating effectively with team members.

• Prioritizing tasks based on deadlines and importance

• Setting clear goals and milestones to track progress

• Communicating effectively with team members to ensure everyone is on the same page

• Proactively identifying potential roadblocks and finding solutions to overcome them

I prioritize information based on user needs, context, and stage of the user journey.

• Understand user goals and tasks at each stage of the journey

• Prioritize essential information that aligns with user needs

• Consider the context and user's mental model to determine relevance

• Use progressive disclosure to reveal information gradually

• Test and iterate based on user feedback

Listen to their concerns, empathize with them, offer solutions, and follow up to ensure satisfaction.

• Listen actively to their concerns without interrupting.

• Empathize with their situation and show understanding.

• Offer solutions or alternatives to address their issues.

• Follow up with the customer to ensure their satisfaction and resolve any remaining concerns.

• Apologize for any inconvenience caused and take responsibility for the situation.

• Provide compensation or discounts if nece...read more

I approach disagreements with stakeholders by actively listening, seeking common ground, and proposing solutions that align with project goals.

• Listen actively to understand the concerns and perspectives of stakeholders

• Seek common ground by focusing on shared project goals and objectives

• Propose solutions that address the concerns of stakeholders while also aligning with project requirements

• Collaborate with stakeholders to find a compromise that benefits the project as a whole

HTML tags are used to define the structure and content of a web page.

• HTML tags are enclosed in angle brackets, like <tag>.

• They are used to define elements such as headings, paragraphs, images, links, etc.

• Attributes can be added to tags to provide additional information or styling.

• Example: <h1>This is a heading</h1>

I am open to discussing the package range based on the project requirements and scope.

• I am willing to consider joining with a lower package if the project offers growth opportunities or valuable experience.

• I can negotiate other benefits or incentives in lieu of a higher salary, such as flexible work hours or additional training opportunities.

• I would like to understand the project budget constraints and discuss how my skills and expertise can add value within those limitations...read more

Deductions reduce taxable income, while exemptions exclude certain income from taxation.

• Deductions are expenses that can be subtracted from taxable income, reducing the amount of income subject to tax.

• Exemptions are specific amounts that can be excluded from taxable income, such as personal exemptions for each taxpayer and dependents.

• Deductions are based on expenses incurred, while exemptions are based on specific criteria or categories.

• Examples of deductions include mortgage...read more

I have 3 years of experience at my previous company working on developing web applications using Java and Spring framework.

• Developed web applications using Java and Spring framework

• Collaborated with team members to design and implement new features

• Participated in code reviews and testing processes

I enjoy finding bugs and ensuring software quality.

• I have a keen eye for detail and enjoy problem-solving.

• I like the challenge of testing different scenarios and uncovering issues.

• I take pride in ensuring that the software meets the requirements and functions correctly.

• I believe that software testing plays a crucial role in delivering a high-quality product to customers.

Kubernetes svc, roles, and rolebindings are key components for managing access control and network communication within a Kubernetes cluster.

• Kubernetes svc (service) is an abstraction that defines a logical set of pods and a policy by which to access them.

• Roles are used to define permissions within a namespace, specifying what actions a user or group can perform.

• Rolebindings are used to bind roles to subjects, such as users or groups, granting them the defined permissions.

• Exa...read more

Design a hotel booking system

• Use a database to store information about hotels, rooms, availability, bookings, and customers

• Implement a user-friendly interface for customers to search for hotels, view room availability, and make bookings

• Include features like filtering by price, location, amenities, and room type

• Handle payment processing securely and integrate with third-party booking platforms if needed

Dealing with system crashes due to memory leaks

• Identified memory leaks using memory profiling tools

• Implemented code optimizations to reduce memory usage

• Utilized automated testing to catch memory leaks early

• Collaborated with team to prioritize and fix memory leak issues

I will explain my code and suggest improvements for better performance and readability.

• Start by providing an overview of the code structure and functionality.

• Explain the key algorithms and data structures used in the code.

• Discuss any potential bottlenecks or areas for optimization.

• Suggest improvements such as refactoring for better readability, optimizing algorithms, or implementing best practices.

• Provide examples of before and after code snippets to illustrate improvements.

My writing process involves research, outlining, drafting, editing, and collaborating with stakeholders.

• Researching the topic thoroughly to understand the audience and goals

• Creating an outline to organize key points and structure the content

• Drafting the content with a focus on clarity, conciseness, and user-centric language

• Editing for grammar, style, and consistency

• Collaborating with stakeholders such as designers and product managers for feedback and revisions

The VAT efile name for Netherlands is known as 'BTW-aangifte'.

• VAT efile name for Netherlands is 'BTW-aangifte'

• BTW stands for 'Belasting over de Toegevoegde Waarde', which translates to 'Value Added Tax' in English

The VAT refund box number in Italy is Box 12 on the VAT return form.

• The VAT refund box number in Italy is Box 12 on the VAT return form.

• This box is used to report the amount of VAT that can be refunded to the taxpayer.

• Taxpayers need to accurately fill out Box 12 to claim their VAT refund.

The VAT payment form number in Italy is known as F24.

• The VAT payment form number in Italy is called F24.

• It is used for making VAT payments to the Italian tax authorities.

• The form includes details such as the taxpayer's information, the amount of VAT due, and the period for which the payment is being made.

BIP reports can be generated in various formats such as PDF, Excel, HTML, etc.

• BIP reports can be generated in PDF format for easy printing and sharing

• Excel format is useful for further data analysis and manipulation

• HTML format allows for easy viewing in a web browser

EBITDA stands for Earnings Before Interest, Taxes, Depreciation, and Amortization. It is a measure of a company's operating performance.

• EBITDA is calculated by adding back interest, taxes, depreciation, and amortization to net income.

• It is used to analyze and compare profitability between companies because it eliminates the effects of financing and accounting decisions.

• EBITDA is commonly used in valuation metrics such as EV/EBITDA.

• Example: Company A has a net income of $1 mil...read more

OOPs concepts refer to Object-Oriented Programming concepts which include Inheritance, Encapsulation, Polymorphism, and Abstraction.

• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and showing only the necessary features.

DB concepts include normalization, indexing, transactions, and query optimization.

• Normalization: Organizing data into tables to reduce redundancy and improve data integrity.

• Indexing: Creating indexes on columns to speed up data retrieval.

• Transactions: Grouping database operations into atomic units to ensure data consistency.

• Query optimization: Improving the performance of database queries by optimizing execution plans.