Interview Questions

APEX (Core Development)

1. What is Apex in Salesforce? How is it different from other programming languages?
2. What are the different types of Apex Triggers?
3. What is the difference between before and after triggers?
4. How do you handle bulk processing in Apex?
5. What are the best practices for writing Apex code?
6. What is the difference between synchronous and asynchronous Apex?
7. What is the use of the @future annotation in Apex?
8. What are Batch Apex and its advantages?
9. How do you monitor Batch Apex execution?
10. What is Queueable Apex, and how does it differ from Batch Apex?
11. What are Governor Limits in Salesforce?
12. What is the difference between a List, Set, and Map in Apex?
13. How can we perform DML operations efficiently?
14. How do you prevent SOQL injection in Apex?
15. What is the purpose of Custom Metadata and Custom Settings in Apex?
16. How do you handle exceptions in Apex?
17. How does Platform Cache work in Salesforce?
18. How do you test Apex classes and what is the recommended code coverage?

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🔹 TRIGGERS

19. What is a trigger in Salesforce, and when do you use it?
20. What are Trigger.new and Trigger.old in Apex?
21. What are Trigger.newMap and Trigger.oldMap?
22. What is a recursive trigger, and how do you prevent it?
23. How do you implement a trigger framework in Salesforce?
24. Can we call a future method from a trigger? Why or why not?
25. What is the difference between trigger and workflow in Salesforce?
26. Can we perform DML operations inside a trigger? What are the considerations?
27. What are some common issues with triggers and how do you debug them?
28. How do you write a trigger to update a related object?
29. Can we call a batch class from a trigger?

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🔹 LIGHTNING WEB COMPONENTS (LWC)

30. What is Lightning Web Component (LWC)? How is it different from Aura components?
31. Explain the lifecycle of an LWC component.
32. How does data binding work in LWC?
33. How do you handle events in LWC?
34. How do you communicate between parent and child components in LWC?
35. What is the difference between @api, @track, and @wire in LWC?
36. How do you make an API callout from an LWC component?
37. How can we use LDS (Lightning Data Service) in LWC?
38. What is the role of @wire in LWC?
39. How do you handle conditional rendering in LWC?
40. How do you create a reusable LWC component?
41. What is the purpose of renderedCallback() in LWC?
42. What are decorators in LWC and why do we use them?
43. How do you navigate between pages in LWC?
44. How do you handle security in LWC components?
45. What is Lightning Message Service (LMS)?
46. How do you handle asynchronous operations in LWC?

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🔹 INTEGRATIONS (REST & SOAP APIs)

47. What is a REST API and how is it used in Salesforce?
48. What is the difference between REST and SOAP APIs?
49. How do you perform a REST API callout in Apex?
50. How do you handle authentication in REST API callouts?
51. What are Named Credentials in Salesforce?
52. How do you handle API rate limits in Salesforce?
53. What is a Connected App in Salesforce?
54. How do you expose an Apex class as a RESTful service?
55. How do you call an external system using a @future method?
56. What is the purpose of the Continuation class in Salesforce?
57. How do you secure an API endpoint in Salesforce?
58. How do you integrate Salesforce with third-party applications?
59. What is the difference between Outbound Messages and REST Callouts?
60. How do you consume a third-party SOAP API in Salesforce?
61. What are Remote Site Settings and why are they needed?
62. What are the best practices for handling large API responses?
63. What are Webhooks and how can we use them with Salesforce?
64. How do you use OAuth authentication in Salesforce?

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🔹 DATA MODEL & SECURITY

65. What are the different types of relationships in Salesforce?
66. What is the difference between Master-Detail and Lookup relationships?
67. What is a Junction Object in Salesforce?
68. How do you optimize SOQL queries for better performance?
69. What is Field Level Security and how does it work?
70. What is Role Hierarchy and how does it affect record access?
71. How does OWD (Organization-Wide Defaults) work?
72. What are Sharing Rules and when do you use them?
73. What is the difference between Permission Sets and Profiles?
74. How do you implement Row-Level Security in Salesforce?
75. What is the difference between Standard and Custom Objects?
76. What is the difference between Record Types and Page Layouts?
77. What are Skinny Tables in Salesforce?
78. How does Salesforce handle multi-tenant architecture?
79. What is the Shield Platform Encryption in Salesforce?
80. How do you use Apex Managed Sharing?
81. What is the difference between an External ID and a Unique Field?
82. What are the best practices for designing a scalable data model?

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🔹 PERFORMANCE OPTIMIZATION & GOVERNOR LIMITS

83. What are the different types of Governor Limits in Salesforce?
84. How can we optimize SOQL queries to avoid hitting limits?
85. What are the different types of indexes in Salesforce?
86. How do you reduce CPU time limit errors in Salesforce?
87. How do you handle large data volumes in Salesforce?
88. What is the difference between Standard, Custom, and Big Objects?
89. How does Salesforce handle transaction control?
90. What is Asynchronous Processing and when should you use it?
91. How do you debug and analyze performance issues in Salesforce?
92. How do you optimize batch jobs for performance?
93. What are Salesforce Governor Limits for APIs?
94. What is Heap Size and how can we manage it?
95. What is the SOQL Query Plan Tool and how do you use it?
96. How do you implement caching in Apex?

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🔹 DEPLOYMENT & CI/CD

97. What are the different deployment methods in Salesforce?
98. What are Change Sets and how do they work?
99. What is the difference between Ant Migration Tool, Change Sets, and Salesforce DX?
100. How do you use GitHub with Salesforce projects?
101. How do you set up a CI/CD pipeline for Salesforce development?
102. What is Scratch Org and how is it used?
103. How do you manage metadata in Salesforce DX?
104. How do you roll back a deployment in Salesforce?
105. What are the best practices for version control in Salesforce projects?

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🔥 Final Thoughts

This is a complete list of Salesforce Developer interview questions covering Apex, Triggers, LWC, Integrations, Security, Performance, and Deployment.