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The demand for developers in Salesforce is insatiable due to the ever-increasing number of businesses. Expectations from developers are also in the high zone due to the constant evolution of technologies powering Salesforce.

So, if you are going for a developer job interview and looking for an extra edge, you have landed at the right place. 

You can impress an interviewer with knowledge about Salesforce as a platform. But most of the other candidates also know the same as well. You will gain an extra boost in confidence with our collection of Salesforce Developer Interview questions.

They are carefully picked by experts with much more experience and insights into the interview process. 

So, let us go through them quickly!

Salesforce Developer Interview Questions

We have provided a list of carefully selected Developer Interview questions below. You can choose to go through them in your preferred order.

Our catalogue includes questions on platform, programming, integrations, and LWC. 

Platform

In this section, there are Salesforce developer interview questions for freshers. You can retest your basic knowledge of the Salesforce platform and its tools through them. So, if you find difficulty answering, try reviewing your basics again.    

1. What declarative tools can we use to customize a Salesforce instance?

The most basic declarative tool is custom fields and custom objects, which can be defined declaratively and allow us to customize an instance’s database schema. We can further customize objects through the use of page layouts and Lightning app pages to declaratively customize the look and feel of a record’s page.

If we wish to create declarative automation, we should be using Flow. While Process Builder and Workflow Rules exist, these are being deprecated by Salesforce so declarative automation should be created via Flow instead.

2. When would we choose programmatic development over declarative?

Declarative tools excel when rapid development is required as, due to their nature, they allow rapid iteration and usually have shorter build times. In scenarios where the business logic required is relatively straightforward, with very few “gotchas”, it usually makes sense to take advantage of declarative tools with faster build time, which can translate to a cheaper build.

We would choose programmatic development when the requirements become more complex, such as in specialized business processes that don’t lend themselves to Flows, etc. Other scenarios are where the performance or user interface is of paramount importance.

One of the main advantages of running a coded solution is that performance will exceed that of a declarative solution due to the ability to use more specialized logic and remove overheads.

This also applies to user interfaces, as using a coded solution allows us to fully customize it to our requirements, whereas using declarative tools means we are stuck with what comes out of the box – which may not provide the desired outcome.

3. What is the Salesforce release model?

Salesforce has major updates three times a year, seasonally, in Spring, Summer, and Winter. The specific dates for these vary; however, around 4-6 weeks before a release, sandbox instances are updated to allow for testing of any customizations in an org.

4. What are governor limits? Please provide some examples.

Governor limits are resource utilization limits enforced by Salesforce to prevent runaway processes from monopolizing resources. This is vital as Salesforce is a multi-tenanted environment, so run resources are shared.

Examples of these are the number of SOQL queries, DML statements, and the number of HTTP callout requests in a transaction.

5. How can you prevent duplicate records in Salesforce?

To prevent duplications of records in Salesforce, the following steps are taken:

  • Log in to your Salesforce account, go to the setup, and then search for the Duplicate rule from the quick find box.
  • Click on the duplicate rule to open all duplicate rules page. Click on New rule options and select the object that you want.
  • Now, edit the duplicate rule by filling in the details and description. Following that, check the record level security and specify what happens in case of a duplication try from the user.
  • Next, create the matching rule by selecting the create new matching rule option.
  • Fill in the details of the matching rule and click on save.
  • Next, click on the activate option for a matching rule.
  • Following that, activate the duplicate rule as well in a similar manner.
  • To test out the result, search sales in the app launcher and try to create a new entry for the object by clicking on the New option.
  • If your entry is duplicate, then a warning message will pop up on the screen.

6. What Salesforce-supported development tools are there?

The primary Salesforce-supported development tool is the Salesforce Extensions for VS Code, which utilizes the Salesforce Command Line Interface.

7. What are the three types of object relationships?

  1. Lookup Relationship: In this relationship type, two records are related to each other through one object (the child) having a lookup field that is pointing to the other (the parent).
  2. Master-detail: Similar to a lookup relationship, however, in this case, the child record is considered the detail and the parent the master. This type of relationship changes some behaviours of the detail records, such as having to share controlled by the master and allowing particular rollup-summary fields to be created on the master. Detail records are dependent on the master record, and in case of cascade deletion, child records are also deleted. 
  3. Self: A lookup relationship that points to the same object, allowing a hierarchy or chaining of records of the same type. However, a record cannot be related to itself.

8. What is the difference between Master details & Lookup relationship? 

Here are the critical differences between master details & lookup relationships:

Master detailsLookup
In this relationship type, a child cannot exist without a parent (a field is required and cannot be null or blank).Child and parent exist independently (field is not required).
The security settings of the child are inherited from the parent.Security settings are set independently.
Deleting parent also deletes all child records (Cascade delete).Deletion of parent does not affect child records.
Rollup summary is possible (count, sum, min, max).No Rollup summary (Apexexchange tools available).
Standard objects cannot be the child of custom objects.Standard objects can be the child of custom objects.
There can be up to two master-details on an object (two parents possible for a child).Up to 40 lookups are possible on a custom and standard object.

9. What is SOQL and its purpose?

SOQL stands for Salesforce Object Query Language, and as the name suggests, it is the primary language used for performing queries against the database. While its syntax is similar to SQL, there are a few key differences, mainly that SOQL is exclusively used for queries (i.e. SELECT statements).

It retrieves data from a single object and those directly related to it. SOQL can be used both within Apex code – to query records for consumption by code – or via the API and tools that use it – such as in data loader tools. Eg.

List<Contact> contacts = [SELECT Id FROM Contact Where AccountId = : accountId];

10. What is the role of the Validation rule in Salesforce?

Validation rules are necessary to ensure the accuracy and consistency of data in Salesforce. They can used to play the following roles:

  • Data type check
  • Code check
  • Range check
  • Format check
  • Consistency check
  • Uniqueness check
  • Presence check
  • Length check
  • Lookup
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Programming

In this section, the questions are based on the programming tools that you, as a developer, can use in Salesforce. Thus, you can use them to review and evaluate your programming fundamentals.  

11. What is required for deploying Apex code to a Production instance?

When deploying Apex code to production, there are three things which are required:

  1. All classes and triggers must be successfully compiled.
  2. Tests must cover at least 75% of all Apex code, and there must not be any failures.
  3. All triggers must have at least 1% coverage.

12. What programming languages can we use to customize a Salesforce instance?

The server-side language used to customize Salesforce is called Apex, which has a syntax similar to Java. On the front end, we have several technologies, the main one being Lightning Web Components, followed by the older and now more niche Aura Components and Visualforce – all of which use HTML, CSS, and JavaScript in conjunction with Apex. We can also use Flow, which is a low code language to customize both the front end and the back end.

13. What are the different events for an Apex Trigger?

Triggers are split into two main types: before and after.

  • Before triggers run before a record is saved into the database, it is optimally used for the same record calculations and validations.
  • After triggers run after the record has been saved and should ideally be used for working on records other than the one invoking the trigger.

Triggers are then further broken down into the type of operation that invokes it. These are insert, update, delete, and undelete. This allows the triggers to be customized only to be invoked when explicitly required.

14. What is the difference between Triggers and Flows?

The primary differences between triggers & flows are the following:

  • Coding is required in the trigger, but in the case of Flow, it is not.
  • A trigger is executed after the Flow.
  • In Trigger, there is a need to manually write the test class, while in Flow, there is no need for it at all.
  • There is a clear pictorial presentation of logic in Flow to build it.
  • If you want to build a complex trigger, then you should go with the apex trigger.

15. What is a global Apex class?

A global Apex class is an Apex class that has been declared with the global access modifier. It means that the class is visible and usable by any Apex code running in any namespace. Global Apex class should rarely be used and only implemented when explicitly necessary, e.g., within managed packages or for Apex REST web services.

16. What is an Interface, and why would we use one?

An interface is similar to a class, except none of its methods have an implementation. It is helpful for abstracting method declaration from its specific implementation. A typical example of this can be found with batch classes, which implement the standard Salesforce database interface. Batchable.

Using interfaces signifies that a class will explicitly implement the methods it defines, potentially allowing us to implement different behaviors at run time based on context.

Integrations

Developers must also be familiar with the integration process to be job-ready. You can check out the most important integration-related queries the interviewer may ask below. 

17. How can we integrate into external REST web services?

For integrating with external REST web services, we tend to use HTTP callouts to invoke the external API. We can use the JSON and XMLStreamWriter classes to build payloads to match the specifics of the external API.

18. How can an external system integrate into Salesforce?

External systems can utilize the built-in REST API provided by Salesforce for simple integrations. This could be for creating, updating, or querying records for more niche or bespoke inbound integrations.

You can use a connected app for requesting access to Salesforce data on behalf of an external application. It must be integrated with the Salesforce API using the OAuth 2.0 protocol.

19. How can we secure credentials used for outbound integrations?

Depending on the type of credentials, we have a few options. The most preferred is Named Credentials, which specify the base endpoint and the authentication credentials. These are preferred since Salesforce then handles the authentication for us and keeps the credentials away from prying eyes.

Alternatively, if named credentials are not suitable, we could choose to store the credentials in a Custom Metadata type, which will allow different credentials to be used across different environments, and we can secure the permissions to access the metadata type. We should never be hard coding the credentials for integrations within our code as this is very insecure.

LWC (Lightning Web Components)

As candidates preparing for a Salesforce developer career, being familiar with LWC components is imperative. So, prioritizing your choice, we have selected questions about LWC components the interviewer may ask you about.

20. What is the difference between LWC and Aura components?

Lightning Web Components is built using current web standards to build custom HTML elements through Web Components, designed to run in a lightweight and performant manner.

Aura components are the legacy Lightning Component framework but still utilize JavaScript and HTML for development.

21. Why would we use Lightning Web Components over Aura components and vice versa?

Ideally, we should always use Lightning Web Components for any new developments due to their easier development and better performance. We should only use Aura components if we wish to use a piece of functionality that still needs to be supported in LWCs; in this case, we should wrap an LWC inside of an Aura component.

22. Where can we use Lightning Components?

Lightning components can be deployed in many places across an org. These can be admin-decided ones or added by developers. These include:

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

23. What is SLDS?

The Salesforce Lightning Design System (SLDS) is the user interface design framework used for designing, styling, and building all aspects of Salesforce Lightning.

As developers, you can utilize the SLDS-provided CSS styles or component markup templates to build custom components that provide a consistent UI with the rest of the platform. SLDS also provides guidelines around accessibility, language guidance, and icons.

24. What is a roll-up summary field?

Roll-up summary fields are particular fields that lie on the master side of a master-detail relationship. These fields have their values calculated based on an aggregate of the detail side of the relationship – this could be anything from the number of records to a field value summed up. It allows us to skip using Apex to aggregate record values that are part of a master-detail relationship.

25. How can we enforce Sharing Rules within our Apex code?

We can define our class to use with the sharing keywords in its definition. Alternatively, we can use the inherited sharing keywords, which inherit the sharing modifier from its calling class for when we need code that should handle this dynamically

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Conclusion

In conclusion, navigating the realm of Salesforce development requires a comprehensive understanding of the platform’s intricacies and the ability to adapt to evolving technologies.

The demand for skilled Salesforce developers is ever-increasing, making job interviews in this domain competitive. You need a solid grasp of key concepts and scenarios to stand out and excel in Salesforce Developer interviews.

The curated set of Salesforce Developer Interview Questions presented here aims to equip you, whether in the category of freshers or experienced developers, with the knowledge needed to tackle interviews confidently.

These questions cover a broad spectrum of topics, from platform-specific details and programming languages to declarative tools, integration strategies, and Lightning Web Components (LWC) nuances.

About Author

Shrey Sharma

The youngest Salesforce MVP in the world in 2019, is a successful serial entrepreneur and CEO of Cyntexa - a prominent global Salesforce Consulting and Implementation Partner. He's also the driving force behind Salesforce Hulk, a popular YouTube channel providing valuable insights to Salesforce enthusiasts. As a thought leader in the Salesforce ecosystem, Shrey is committed to driving business growth through technology.

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