18Software Engineering · Interview Prep · Free
Salesforce Developer interview questions — and how to answer them.
These are the questions Salesforce Developer candidates are most likely to face, from openers to the hard ones — each with a note on what a strong answer covers. Want more, tuned to your level? Use the free generator below.
What interviewers look for in a Salesforce Developer
- Concrete examples of systems you've built, with the trade-offs you weighed
- How you debug — the process, not just the fix
- Collaboration signals: code review, disagreements, mentoring
Likely Salesforce Developer interview questions
1. What experience do you have with Salesforce development, and which editions have you worked with?
Mention specific editions (Developer, Professional, Enterprise), orgs you've managed, and core modules you've used.
2. Explain the difference between Apex and Visualforce. When would you use each?
Apex is server-side logic; Visualforce is UI rendering. Mention use cases like custom controllers, lightning components vs classic pages.
3. Walk us through how you've implemented a custom object and related fields in a past project.
Cover object design, field types, relationships, validation rules, and how it solved a business requirement.
4. Describe your experience with Salesforce Lightning. Have you built Lightning Components or Lightning Web Components?
Distinguish between Aura components and LWC; mention component lifecycle, event handling, and when you'd choose each.
5. How do you approach debugging and testing Apex code? What tools do you use?
Mention debug logs, Developer Console, unit tests with @isTest, code coverage requirements, and best practices.
6. Tell us about a time you optimized Salesforce code for performance. What was the issue and how did you fix it?
Address governor limits (SOQL queries, DML statements), batch processing, caching, and profiling tools used.
7. How would you design an integration between Salesforce and an external system? What technologies would you consider?
Discuss REST/SOAP APIs, named credentials, callouts, error handling, security, and whether you'd use middleware or native integrations.
8. Explain your approach to writing maintainable, testable Apex code. What design patterns have you used?
Cover separation of concerns, trigger handlers, service layer pattern, dependency injection, and code organization best practices.
9. Describe a complex business requirement you implemented. How did you break it down and what challenges arose?
Show problem-solving, stakeholder communication, technical trade-offs considered, and how you ensured requirements were met.
10. Walk us through writing a test class for an Apex trigger with dependencies and asynchronous operations.
Cover test data setup, mocking dependencies, testing scheduled/batch jobs, achieving 85%+ coverage, and edge cases.
11. How do you handle transaction management and rollback scenarios in Apex? Explain with a real example.
Discuss Savepoint, DML exceptions, nested transactions, all-or-nothing behavior, and when to use Database methods vs DML statements.
12. Design a scalable solution for processing 100,000 records daily in Salesforce. How would you handle governor limits and ensure reliability?
Propose batch Apex, scheduled jobs, chunking logic, error logging, monitoring, async processing, and idempotency considerations.
Want to practice answering live with scored feedback? Try the Mock Interview Coach. Applying too? See a Salesforce Developer cover letter example.
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