Salesforce Developer Interview Questions and Answers
Here are the Salesforce Developer Interview Questions (Basic to Advanced – 2026)
Salesforce Developer Interview Basic Level Questions & Answers
1. What is Apex in Salesforce ?
Apex is a strongly typed, object-oriented programming language used in Salesforce to execute flow and transaction control statements on the Salesforce platform. It allows developers to add custom business logic. Apex runs on the Salesforce Lightning Platform and is similar to Java.
2. What are the different types of Apex Triggers ?
There are two main types of triggers: Before Triggers and After Triggers Before triggers are used to update or validate record values before saving
After triggers are used to access field values set by the system and to work with related records.
3. Difference between Before and After Triggers ?
Before triggers run before data is saved to the database and are used for validation or updating fields. After triggers run after records are saved and are mainly used for related record updates or external integrations.
4. What are Governor Limits ?
Governor Limits are runtime limits enforced by Salesforce to ensure efficient use of shared resources in a multi-tenant environment.
They restrict the number of SOQL queries, DML operations, CPU time, and more within a single transaction.
5. What is SOQL and how is it different from SOSL ?
SOQL (Salesforce Object Query Language) is used to query records from a single object or related objects.
SOSL (Salesforce Object Search Language) is used to search text across multiple objects simultaneously.
6. What is a Wrapper Class ?
A Wrapper Class is a custom class used to combine different objects or variables into a single structure. It is mainly used in Visualforce and LWC to display combined data on the UI.
7. What is a Static Variable in Apex ?
A static variable belongs to the class rather than an instance of the class. It retains its value within a single transaction and is commonly used to prevent trigger recursion.
8. What is the difference between List, Set, and Map ?
List allows duplicate values and maintains order. Set does not allow duplicates and is unordered. Map stores data in key-value pairs and allows fast retrieval using a key.
9. What is a Test Class in Salesforce ?
A Test Class is used to test Apex code and ensure it works as expected. Salesforce requires at least 75% code coverage before deploying code to production.
10. What is Code Coverage and why is it important ?
Code coverage indicates the percentage of Apex code executed during testing. It ensures code reliability, quality, and is mandatory (minimum 75%) for deployment.
Salesforce Developer Interview Intermediate Level Questions & Answers
11. What are Bulkification best practices in Apex ?
Bulkification ensures code works for multiple records efficiently. Avoid SOQL and DML inside loops, use collections like List and Map, and process records in batches.
12. What is the difference between Future, Batch, and Queueable Apex ?
Future Apex runs asynchronous tasks for small operations. Batch Apex processes large data sets in chunks. Queueable Apex allows chaining jobs and provides more flexibility than Future methods.
13.What is a Batch Apex lifecycle ?
Batch Apex has three methods: start(), execute(), and finish(). Start collects records, execute processes them in batches, and finish runs post-processing logic.
14. What is Scheduled Apex ?
Scheduled Apex allows you to run Apex classes at specific times using a CRON expression. It is used for periodic tasks like daily reports or data cleanup.
15. What is Custom Metadata Type ?
Custom Metadata Types store configuration data that can be deployed and packaged. They are mainly used for app configurations and integrations.
16. What is the difference between Custom Settings and Custom Metadata ?
Custom Settings store configuration data but are not easily deployable. Custom Metadata is deployable and recommended for application configuration in modern Salesforce development.
17. How do you handle Exceptions in Apex ?
Exceptions are handled using Try-Catch blocks. You can log errors, display meaningful messages, or use custom exception classes for better error handling.
18. What is a Lightning Web Component (LWC) ?
Lightning Web Component (LWC) is a modern UI framework built using standard web technologies like HTML, CSS, and JavaScript. It provides better performance and follows web standards compared to Aura.
19. Difference between Aura Components and LWC ?
LWC is faster and based on modern web standards. Aura is an older framework with more complex syntax. LWC is recommended for new development.
20. How do you call Apex from LWC ?
Apex methods must be annotated with @AuraEnabled. You can call them using wire service or imperative method calls in JavaScript.
Salesforce Developer Interview Advanced Level Questions & Answers
21. What is an Apex Transaction and how does it work ?
An Apex transaction is a set of operations executed as a single unit. If any part fails, the entire transaction is rolled back to maintain data integrity.
22. How do you avoid recursion in Triggers ?
Use static Boolean variables to control execution. Implement proper trigger frameworks and ensure logic runs only once per transaction.
23. What are different Integration Patterns in Salesforce ?
Common patterns include Remote Process Invocation, Batch Data Synchronization, and Event-Driven Architecture. Integrations can be real-time or asynchronous using APIs or Platform Events.
24. What is OAuth and how is it used in Salesforce integrations ?
OAuth is an authentication protocol that allows secure API access without sharing passwords. Salesforce uses OAuth for connected apps and external integrations.
25. How do you optimize SOQL queries for large data volumes ?
Use selective filters, indexed fields, and avoid unnecessary fields in SELECT. Use Query Plan tool and Batch Apex for large datasets.
26. What is a Named Credential ?
Named Credential securely stores authentication details for external callouts. It simplifies callouts by removing hardcoded credentials in Apex code.
27. How do you secure Apex code ?
Use with sharing keywords, field-level security checks, CRUD validations, and avoid hardcoding sensitive data.
28. What is Platform Event and when would you use it ?
Platform Events enable event-driven architecture in Salesforce. They are used for asynchronous communication between systems.
29. How does Salesforce handle multi-tenant architecture ?
Salesforce runs multiple customers on the same infrastructure while keeping data isolated. Governor limits ensure fair resource usage across tenants.
30. How is AI impacting Salesforce Development in 2026 ?
AI tools automate code generation, data analysis, and customer insights. Features like Einstein AI improve productivity, predictive analytics, and automation within Salesforce development.
2026 Trend-Based Questions
1. How is AI (Einstein & Generative AI) changing Salesforce development in 2026 ?
AI is transforming Salesforce development by enabling predictive analytics, intelligent automation, and generative content creation. Developers now integrate Einstein AI APIs and prompt-based services into Apex and LWC solutions. AI reduces manual coding effort by suggesting logic and improving productivity. It also helps build smarter, data-driven applications for sales and service teams.
2. How do you design AI-ready Apex and LWC solutions for scalable automation ?
To design AI-ready solutions, I build modular Apex classes and reusable LWC components. I ensure clean data models because AI depends on high-quality structured data. I use asynchronous processing like Queueable or Batch Apex for scalable automation. Security and governor limits are always considered during design.
3. What best practices do you follow for building secure API integrations using OAuth 2.0 and Named Credentials ?
I use OAuth 2.0 for secure token-based authentication instead of storing passwords. Named Credentials help manage endpoint URLs and authentication centrally. I restrict API access using profiles and permission sets. I also handle callout exceptions properly and monitor API usage limits.
4. How do you optimize performance when working with Large Data Volumes (LDV) in enterprise orgs ?
I use selective SOQL queries with indexed fields and proper filters. I avoid SOQL inside loops and follow bulkification best practices. Batch Apex is used to process large datasets efficiently. I also review query plans and archive unnecessary old data when possible.
5. How are Platform Events and Event-Driven Architecture shaping modern Salesforce development ?
Platform Events enable real-time, event-driven communication between systems. They decouple systems, making integrations more scalable and flexible. Developers use them for asynchronous processing and external system notifications. Event-driven architecture improves performance and supports microservices-based integration models.
Summary
- In 2026, a Salesforce Developer is expected to have strong fundamentals in Apex, Triggers, SOQL, and Governor Limits, along with solid knowledge of asynchronous processing like Future, Batch, and Queueable Apex. Understanding bulkification, transaction control, and performance optimization is critical for handling large data volumes in enterprise environments.
- Modern development also focuses heavily on Lightning Web Components (LWC), secure integrations using OAuth and Named Credentials, and event-driven architecture with Platform Events. Additionally, AI-powered features like Einstein and Generative AI are transforming how developers build intelligent, scalable, and automated Salesforce applications.
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