Senior Ruby on Rails Developer

Senior Ruby on Rails Developer Interview Questions and Answers

Updated 7 Jul 2025
5d ago

Q. How can an application running in the cloud with tightly coupled infrastructure be deployed to on-premise?

Ans.

An application running in cloud with tightly coupled infrastructure can be deployed to on-premise by decoupling the components and using containerization.

  • Decouple the application components to make them more portable

  • Use containerization technologies like Docker to package the application and its dependencies

  • Deploy the containerized application to on-premise servers using tools like Kubernetes for orchestration

1d ago

Q. How would you add a new column to a database table in production that already contains 100 million rows of data?

Ans.

Use a tool like Rails migration to add a new column to the database table in production with 100 million data.

  • Create a new Rails migration file to add the new column to the database table.

  • Test the migration locally to ensure it works as expected.

  • Deploy the migration to the production environment during a maintenance window to avoid downtime.

  • Consider using tools like ActiveRecord's `change_column` method to efficiently add the new column to a large dataset.

Asked in Encora

4d ago

Q. How do you compare STI with Polymorphic association?

Ans.

STI is used for inheritance while polymorphic association is used for multiple associations

  • STI is used for modeling inheritance relationships where different classes share common attributes and behaviors

  • Polymorphic association is used when a model can belong to more than one other model on a single association

  • STI can lead to a large number of columns in a table, while polymorphic association requires an additional column to store the association type and ID

  • STI can be more eff...read more

Asked in Encora

5d ago

Q. Importance of CSRF tokens and CSP headers

Ans.

CSRF tokens and CSP headers are important security measures to protect against cross-site scripting attacks.

  • CSRF tokens are used to prevent cross-site request forgery attacks by generating a unique token for each user session.

  • CSP headers help prevent cross-site scripting attacks by specifying which resources can be loaded on a webpage.

  • Both CSRF tokens and CSP headers are essential in securing web applications against malicious attacks.

Are these interview questions helpful?

Asked in Encora

3d ago

Q. Rails API best practices

Ans.

Rails API best practices

  • Use versioning in API endpoints for future changes

  • Implement proper error handling and response codes

  • Follow RESTful principles for resource naming and routing

  • Use serializers to format JSON responses efficiently

  • Implement authentication and authorization for secure access

Asked in Finastra

4d ago

Q. Design an API rate limiter.

Ans.

Implementing an API rate limiter to control the number of requests a user can make within a certain time frame.

  • Use a token bucket algorithm to track and limit the number of requests per user.

  • Set a limit on the number of requests allowed per user within a specific time window.

  • Implement a sliding window approach to track request timestamps and enforce rate limits.

  • Consider using Redis or a similar caching mechanism to store and manage request data efficiently.

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