💡 Top Salesforce Developer Interview Questions and Answers

🔹 Introduction

Preparing for a Salesforce Developer interview requires a strong understanding of Apex, Lightning Web Components, SOQL, governor limits, triggers, asynchronous processing, and testing.

In this guide, we’ll go through the most commonly asked interview questions with simple answers so you can revise quickly and explain concepts confidently.

🎯 Goal

• Revise core Salesforce Developer concepts
• Understand common interview questions and answers
• Prepare with practical explanations, not just theory

This article is designed to help both freshers and experienced developers get ready for real interview discussions.

⚙️ 1. What is Apex in Salesforce?

Apex is Salesforce's strongly typed, object-oriented programming language used to write custom business logic on the platform.

It is often used for triggers, integrations, automation, validation, and complex data processing.

⚙️ 2. What are governor limits?

Governor limits are platform-enforced limits that control how much resource a transaction can consume.

These limits protect the multi-tenant Salesforce environment and ensure fair usage for all users.

Examples include SOQL query limits, DML limits, CPU time limits, and heap size limits.

⚙️ 3. What is the difference between @wire and imperative Apex in LWC?

@wire is reactive and automatically runs when its parameters change.

Imperative Apex is called manually when you want full control, such as on button click or after custom validation.

Use @wire when data should load automatically, and imperative Apex when you want to decide exactly when the method should run.

⚙️ 4. How do you avoid SOQL queries inside loops?

A SOQL query inside a loop can quickly hit governor limits and slow down your code.

The best practice is to collect record Ids first, query the data once outside the loop, and then use a map or collection to match the results.

This makes your code bulk-safe and much more efficient.

⚙️ 5. What is a bulkified trigger?

A bulkified trigger is written to handle multiple records at once instead of assuming only one record will be processed.

This is important because Salesforce often processes records in batches, not one by one.

A good trigger avoids SOQL and DML inside loops and uses collections instead.

⚙️ 6. What is the purpose of a test class?

Test classes verify that your Apex code works correctly and also help meet code coverage requirements before deployment.

They are a required part of Salesforce development because they help ensure reliability and reduce production issues.

⚙️ 7. What are triggers in Salesforce?

Triggers are Apex code that run before or after insert, update, delete, or undelete events on records.

They are used when you need custom logic that cannot be achieved easily with declarative tools alone.

⚙️ 8. What is the difference between future methods and queueable Apex?

Future methods are simple asynchronous operations, but they have several limitations.

Queueable Apex is more flexible, supports job chaining, and is generally preferred for modern async processing.

⚙️ 9. What is batch Apex used for?

Batch Apex is used to process very large amounts of data asynchronously in smaller chunks.

It is useful for mass updates, cleanup jobs, and data migrations that would exceed synchronous limits.

⚙️ 10. What is the difference between lookup and master-detail relationship?

A lookup relationship is a looser connection between objects and child records can exist independently.

A master-detail relationship is tighter, where the child record depends on the parent and inherits sharing and ownership behavior.

💬 Bonus Tips

• Always explain answers with real project examples
• Keep Apex code bulk-safe and governor-limit friendly
• Understand the difference between declarative and programmatic solutions
• Revise LWC communication patterns and data handling

📺 Watch the Video

🧾 Conclusion

Salesforce Developer interviews usually focus on Apex fundamentals, governor limits, triggers, LWC, async processing, and testing.

If you can explain the concepts clearly and connect them to real-world work, you’ll make a strong impression in the interview.