Bain & Company Platform Engineer Interview Questions and Answers

Q1. How team works in your project?
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Q1. Basic Questions Regarding My Background & Experience.
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Ruby Assignment

Q1. Discussion regarding the submitted assignment, pair programming followed by some technical questions regarding APIs, Architecture, etc.
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MCQ - Logical, AWS, SQL, Python

Q1. Basic Python questions, SQL questions, AWS Questions, Previous project discussion, Day to day responsibilities etc.
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Q1. System design, APIs, projects, products etc.
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Q1. How does Django apply migrations to the database?
Ans. 
Django applies migrations to the database using the 'manage.py migrate' command.
• Django tracks changes to models and generates migration files accordingly.

• The 'manage.py makemigrations' command creates migration files based on model changes.

• The 'manage.py migrate' command applies the generated migration files to the database.

• Migrations help keep the database schema in sync with the changes in Django models.
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Q2. What is hoisting in javascript?
Ans. 
Hoisting in JavaScript is the behavior where variable and function declarations are moved to the top of their containing scope during the compilation phase.
• Variable declarations are hoisted to the top of their scope, but not their assignments.

• Function declarations are fully hoisted, meaning they can be called before they are declared.

• Hoisting can lead to unexpected behavior if not understood properly.
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Create a full stack application in 3 days.

Q1. About Project and expertise
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Q2. Why BCG?
Ans. 
BCG offers a challenging and innovative work environment with opportunities for growth and development.
• BCG is known for its cutting-edge technology and innovative projects

• Opportunities for professional growth and development

• Strong company culture focused on collaboration and teamwork
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Q1. Polymorphism, OS Deadlock
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Q1. More about how to resolved code merge issue in Git
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This round includes an assignment which needs to be completed based on Java, Springboot, REST and any Frontend. They evaluated the case study based on how I write the APIs, how normalised my database is, and how user friendly the UI is.

Q1. How will you add pagination in Spring Boot JPA query?

Ans. 

Use Spring Data JPA's Pageable interface to add pagination in queries.

• Use Pageable interface in repository method signature

• Pass PageRequest object with page number, size, and sorting criteria

• Example: public List findAllUsers(Pageable pageable);

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