Top 20 Salesforce Developer Interview Questions & Answers

The need for Salesforce developers is growing every day. A Salesforce developer is essential to the success of an organization. The technologies in Salesforce are evolving day by day and hence the requirement will also increase in the future. 

But cracking a salesforce developer interview can be a challenging task. Therefore being fully prepared before the interview is necessary. And it is not about knowing everything, it is about how you answer a question. In this article we will cover some important questions which can be asked in a salesforce developer interview.

20 Salesforce Developer Interview Questions & Answers

Want to land a Salesforce Developer job? Practice these top 20 Salesforce Developer interview questions and answers! Learn about Apex coding, data modeling, and more. Get ready to impress your future boss!

1. What are governor limits, discuss with examples.

Governor limits can be defined as resource utilization limits that are enforced on Apex code to prevent run away processes. This is crucial as Salesforce is a multi-tenanted environment. 

Examples include SOQL queries, DML statements, and HTTP callout requests during a transaction.

2. How many programming languages are there to customize a Salesforce instance?

The key language for customizing Salesforce is Apex, and its syntax closely resembles that of Java. For the front end, we have several technologies, such as the Lightning Web Components, Aura Components and Visualforce , they all use HTML, CSS, and JavaScript in combination with Apex. We can also use Flow, if we do not wish to code.

3. Define SOQL.

SOQL stands for Salesforce Object Query Language, it is used for performing queries against the database. Its syntax is similar to SQL, but there are some differences which makes it unique.

It is used to get data from one object and its related ones.

4. How can you deploy code to a production instance?

For deploying code to  production instance three things are required: 

1. All classes and triggers should compile with each other.
2. Tests must cover at least 75% of the Apex code without any failure.
3. All triggers should have 1% coverage.

5. Tell us the difference between Queueable Apex, Batch Apex and Scheduled Apex.

Queueable Apex: It is an asynchronous type of Apex code.  We can make a queue for our job ids in this. It will run whenever the resource is available. 

Batch Apex:  Batch Apex is used to process and manage large sets of records. Every set has new governor limits.  And, it can process upto 50 million records. 

Scheduled Apex:  It allows you to schedule apex classes to run on a particular time. It is used for recurring tasks.

6. What are some triggers in Apex?

Triggers are of two main types: before save and after save.

Before save triggers run before a record has been saved into the database  , and is used for calculations and validations. Whereas, after triggers run after the record has been saved, and are used for working on records.

Triggers are then further broken down into four types of operations, insert, update, delete, and undelete.

7. What is a global Apex class?

A global Apex class is an Apex class which we have declared with the global access modifier. This means that any Apex code running now can see and use the class.

8. What is an Interface and what is its use?

An interface is like a class, without its methods having an implementation. It can be used for abstracting method declaration from its implementation. For example Batch classes.

9. How can we allow our Apex code to be called by Lightning components while execution?

To call Apex code from a Lightning Component, it has to be annotated with @AuraEnabled.

10. How can we debug the Apex code?

While running an apex code, we can generate debug logs for that particular code. These logs will  provide an insight into the execution of the code. 

We can also use the Apex Replay Debugger to debug the Apex code, it uses a VS Code to examine the code in detail.

11. Tell us the methods by which you can integrate code with external REST web services?

For integrating with external REST web services, we can use HTTP callouts to generate the external API. We can also use the JSON and XMLStreamWriter classes.

12. How can an external system be integrated into Salesforce?

External systems can be integrated into Salesforce by using the REST API provided by Salesforce. This can be used for creating, updating, querying records.

13. How can we secure credentials which are used for outbound integrations in Salesforce?

We can protect the login details for outbound integrations by using Named Credentials, which define the main endpoint and the authentication information. We can use Custom Metadata types to use different credentials in different environments.

14. What’s the difference between Lightning Web Components and Aura components?

Lightning Web Components is built using custom HTML elements and is designed to run in a lightweight and right manner. Aura components are built using JavaScript and HTML.

15. How can we use Lightning Components?

Lightning components can be used in various ways.

• The Utility Bar
• Outlook and Gmail integrations Flows
• Visualforce pages
• External web pages
• Pre-chat snap-ins
• Quick Actions

16. What is SLDS?

The Salesforce Lightning Design System (SLDS) is a user interface design framework that is used for designing and styling pages and other front end layouts.

17. How can we enforce Field Level Security (FLS) in our Apex code?

There are a few approaches  to enforce Field Level Security within our Apex Code:

1. When running a query, we can include the WITH SECURITY_ENFORCED clause. For more detailed control, 
2. we can use the Security.stripInaccessible() method.

18. How can we implement Sharing Rules in our Apex code?

We need to create a class to enforce sharing rules.

Alternatively, we can also use the Database class methods, such as Database. Update() to enforce sharing rules.

19. When should we skip sharing rules and Field Level Security (FLS) in our code?

We should skip sharing rules and FLS for system-level processes. We should bypass these for specific actions, not for an entire set of business logic.

20. What is dynamic Apex?

Dynamic Apex is a technique in which our code is more flexible by accessing sObjects and fields dynamically, not declaratively, within our code. This is mainly done through the use of sObject tokens and describes how to dynamically access and set sObject field values within our code.

Conclusion

Cracking a salesforce developer interview can be a daunting task, but with the right preparation anyone can crack it with ease. You can go through the above mentioned questions to enhance your knowledge. Hope you have a great interview ahead. 

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