Top 25 Interview Questions and Answers for HubSpot Developer

HubSpot has become a leading platform for CRM, marketing automation, and customer experience management. As companies increasingly customize HubSpot using APIs, CMS, and integrations, the demand for HubSpot Developers is rising rapidly.

If you’re preparing for a HubSpot Developer interview, this blog will help you master core concepts, real-world use cases, and technical depth expected by hiring managers.

1. Who is a HubSpot Developer?

A HubSpot Developer customizes and extends HubSpot functionality using:

• HubSpot APIs
• HubSpot CMS & HubL
• Custom objects
• Integrations with third-party tools
• Automation using workflows and webhooks

They work closely with marketing, sales, and operations teams to build scalable CRM solutions.

2. What are the main components of HubSpot for developers?

HubSpot provides several developer-focused components:

• HubSpot APIs
• CMS Hub
• HubL (HubSpot Markup Language)
• Custom Objects
• Webhooks
• Private & Public Apps
• Workflows & Automation

These allow developers to build custom websites, apps, and integrations.

3. What is HubSpot CMS and how is it different from traditional CMS?

HubSpot CMS is a cloud-based, CRM-connected CMS that enables:

• Dynamic content personalization
• Drag-and-drop page building
• Secure hosting
• Built-in SEO and analytics

Unlike traditional CMSs (like WordPress), HubSpot CMS is natively integrated with CRM and marketing tools, eliminating the need for plugins.

4. What is HubL in HubSpot?

HubL (HubSpot Markup Language) is a server-side templating language used in HubSpot CMS.

It allows developers to:

• Create dynamic templates
• Render CRM data
• Personalize content based on user behavior

5. What are HubSpot APIs?

HubSpot APIs allow developers to:

• Create, read, update, and delete CRM data
• Sync HubSpot with external systems
• Automate workflows

Common APIs include:

• CRM API
• Contacts API
• Companies API
• Deals API
• CMS API
• Automation API

6. Difference between Private Apps and Public Apps in HubSpot?

7. What is OAuth and how does HubSpot use it?

OAuth is an authorization framework that allows apps to access HubSpot data securely without sharing credentials.

HubSpot uses OAuth mainly for:

• Public apps
• Marketplace integrations
• Secure multi-account access

8. What are Custom Objects in HubSpot?

Custom Objects allow businesses to store non-standard CRM data such as:

• Subscriptions
• Properties
• Products
• Vendors

Developers can define relationships between standard and custom objects.

9. How do you create a custom object in HubSpot?

Steps:

1. Go to Settings → Objects
2. Create a custom object
3. Define properties
4. Set object relationships
5. Use APIs or UI to manage records

Custom objects are widely used in complex CRM implementations.

10. What are Webhooks in HubSpot?

Webhooks allow HubSpot to send real-time data to external systems when an event occurs, such as:

• Contact creation
• Deal updates
• Property changes

They are commonly used for real-time integrations.

11. What is a HubSpot Workflow?

Workflows automate actions based on triggers.

Examples:

• Send emails
• Update properties
• Enroll contacts automatically
• Trigger webhooks

Developers often use workflows alongside APIs for automation.

12. What is HubSpot CLI?

HubSpot CLI is a command-line tool that allows developers to:

• Upload CMS files
• Create modules and themes
• Manage HubSpot projects
• Sync local files with HubSpot

It improves version control and development speed.

13. Explain HubSpot CMS Modules.

CMS Modules are reusable components such as:

• Forms
• CTAs
• Sliders
• Testimonials

Modules can be:

• Drag-and-drop
• Custom-coded
• Dynamic

14. How does personalization work in HubSpot CMS?

Personalization is achieved using:

• CRM data
• Smart content
• HubL conditions
• Cookies and behavioral tracking

Example use cases:

• Personalized landing pages
• Dynamic CTAs
• Region-based content

15. What are HubSpot Themes?

Themes are collections of:

• Templates
• Modules
• CSS
• JS
• Global styles

Themes help developers build consistent, brand-aligned websites efficiently.

16. How do you secure HubSpot integrations?

Security measures include:

• OAuth tokens
• Scope-based access
• HTTPS endpoints
• Token rotation
• Webhook signature validation

HubSpot enforces strong API security standards.

17. What is the difference between REST API and Webhooks in HubSpot?

18. How does HubSpot handle rate limits?

HubSpot enforces API rate limits to prevent abuse.

Best practices:

• Batch requests
• Cache responses
• Handle 429 errors gracefully
• Use exponential backoff

19. Can HubSpot be integrated with external systems?

Yes. HubSpot integrates with:

• Salesforce
• SAP
• Shopify
• WordPress
• Custom ERP systems

Developers use APIs, middleware, or iPaaS tools for integrations.

20. What is HubSpot Sandbox?

Sandbox is a testing environment that allows developers to:

• Test workflows
• Validate integrations
• Experiment with CMS changes

It prevents risks to production data.

21. What debugging tools are available in HubSpot?

Developers use:

• API Logs
• Error responses
• CMS preview mode
• Browser developer tools
• Webhook logs

These help identify issues quickly.

22. What is Smart Content in HubSpot?

Smart Content changes dynamically based on:

• Lifecycle stage
• Location
• Device type
• Referral source

It enhances personalization and conversion rates.

23. How does HubSpot support multi-language websites?

HubSpot supports:

• Language variations
• Country targeting
• Localized content
• SEO-friendly URLs

Developers manage translations using CMS tools.

24. What skills are required to become a HubSpot Developer?

Key skills include:

• JavaScript
• REST APIs
• HTML/CSS
• HubL
• CRM concepts
• OAuth & security
• Automation logic

25. Why choose HubSpot Developer as a career?

HubSpot Developer roles offer:

• High demand globally
• Strong ecosystem
• SaaS-focused career growth
• Excellent salary potential
• Opportunities in marketing tech & CRM

Final Thoughts

Preparing for a HubSpot Developer interview requires both technical expertise and platform understanding. These top 25 questions cover core fundamentals, advanced integrations, CMS development, and real-world scenarios commonly asked by recruiters.

If you're a fresher or transitioning into marketing technology, mastering these concepts will give you a strong competitive edge.