Revolut Backend Developer Interview Questions and Answers

Minimum cost to reach last cell of 2D matrix with only downward or right moves.

• Use dynamic programming approach to solve the problem.

• Calculate minimum cost for each cell by considering minimum cost of its adjacent cells.

• Final answer will be the minimum cost to reach the last cell.

Design a stack that supports getMin functionality to return the minimum element in the stack.

• Create two stacks, one for storing the actual elements and another for storing the minimum elements.

• Push elements onto both stacks simultaneously.

• When popping an element, pop from both stacks.

• To get the minimum element, peek at the top of the minimum stack.

TreeSet is a data structure that stores unique elements in sorted order.

• TreeSet is implemented using a Red-Black tree

• It provides O(log n) time complexity for basic operations like add, remove, and contains

• It also provides methods like first(), last(), headSet(), tailSet(), and subSet()

• TreeSet can be used to implement priority queues and sorting algorithms

Design an ArrayList with getMax functionality.

• Create a custom ArrayList class that extends the existing ArrayList class.

• Add a getMax() method that returns the maximum value in the list.

• Override the add() method to keep track of the maximum value in the list.

• Update the maximum value whenever an element is added or removed from the list.

I am a data analyst with experience in analyzing and interpreting complex data sets to drive business insights.

• Experienced in using statistical analysis tools such as Python, R, and SQL

• Proficient in data visualization tools like Tableau and Power BI

• Skilled in data cleaning, data mining, and data modeling techniques

• Strong problem-solving and critical thinking skills

• Effective communicator and team player

• Example: I have w...read more

The biggest hurdle I faced during organizing the tech fest of my college was securing sponsorships.

• Difficulty in convincing companies to sponsor the event

• Limited budget for organizing a large-scale tech fest

• Competition with other college events for sponsorships

• Negotiating sponsorship deals and ensuring deliverables

• Finding sponsors aligned with the theme and objectives of the tech fest

Yes, pursuing an MBA can enhance my skills and open up new career opportunities.

• An MBA can provide a strong foundation in business and management principles.

• It can help develop analytical and problem-solving skills.

• An MBA can broaden my network and provide access to valuable connections.

• It can open up leadership roles and higher-level positions in organizations.

• Having an MBA can increase earning potential and job prosp...read more

Yes, Reliance Fresh should open a store in the north-eastern part of India.

• The north-eastern part of India has a growing population and increasing consumer demand.

• Reliance Fresh can tap into the untapped market potential in the region.

• Opening a store in the north-eastern part of India can help Reliance Fresh expand its presence and increase its market share.

• Reliance Fresh can leverage its existing supply chain and dist...read more

The number of people travelling by local metro in Mumbai is estimated to be in millions.

• Mumbai has a population of over 20 million people.

• The local metro is a popular mode of transportation in Mumbai.

• During peak hours, the metro trains are usually crowded.

• The metro network in Mumbai is extensive, covering various parts of the city.

• The number of daily commuters on the metro can be estimated based on population density a

My day is going well, thank you for asking. I am excited to discuss my resume and learn more about your company.

• My day is going well, thank you for asking

• I have a strong background in data analysis, with experience in financial modeling and market research

• I am eager to learn more about your company's goals and values

• I am excited about the opportunity to contribute my skills and expertise to your team