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Salesforce Apex Interview Questions — Complete Bank, Basic to Advanced (Summer '26)
A comprehensive Apex interview question bank for Salesforce developers, current to Summer '26 / API v67.0. Built from real 2026 interview trends: collections internals, the trigger handler pattern and order of execution, asynchronous Apex including Queueable, finalizers and cursors, the secure-by-default user-mode shift, testing, governor limits and modern language features. Three levels, full explanations, official Salesforce doc links, progress saved on your device.
This is a comprehensive Apex interview question bank, organised from fundamentals to advanced platform internals and built from current 2026 interview trends — current to the Summer ‘26 release (API v67.0). Work the levels in the recommended order: Basic establishes the language, collections and trigger model; Intermediate covers governor-limit discipline, asynchronous execution and the secure-by-default user-mode shift interviewers probe hardest; Advanced moves into finalizers, cursors, security diagnostics, mixed-DML testing and order-of-execution detail that distinguish senior candidates.
Every question explains the correct answer and why each distractor is wrong, and most include a link to the official Salesforce documentation so you can read deeper. Progress and best scores are saved on this device. For the underlying concepts, the Apex Governor Limits guide, the async Apex deep dive, and the trigger frameworks guide go further than any single question can.
A note on currency: this bank reflects the Summer ‘26 secure-by-default model (user mode default from API v67.0, with sharing default, WITH SECURITY_ENFORCED removed) and the Spring ‘26 GA of Apex Cursors. Always confirm version-specific behaviour against the official Apex Developer Guide for your org’s API version.
Frequently asked questions
What Apex topics are most asked in Salesforce interviews in 2026?
Async Apex and security are the two most heavily tested areas. Expect Queueable vs @future, the trigger handler pattern and order of execution, bulkification and governor limits, with/without sharing, DML vs Database methods, and the Summer '26 secure-by-default user-mode change. Modern features like the null coalescing and safe navigation operators and Apex Cursors are increasingly common.
What changed about Apex security in Summer '26 (API v67.0)?
From API v67.0, Apex database operations run in user mode by default instead of system mode, classes with no sharing declaration default to with sharing, and WITH SECURITY_ENFORCED is removed (it becomes a compiler error — use WITH USER_MODE). Triggers always run in system mode regardless of API version.
What are Apex Cursors?
Apex Cursors, generally available in Spring '26, let you point to a very large SOQL result set and traverse it in controlled fetches across chained jobs, rather than loading everything at once. PaginationCursor is a companion type for consistent UI paging.
How should I prepare for an Apex coding interview?
Write bulkified code by default, know the governor limits, be able to explain why a pattern avoids a limit, and practice writing a trigger handler and a test class from memory. Interviews have shifted from definitions toward scenarios, so understand WHY each pattern exists.
What is the most common Apex mistake interviewers screen for?
SOQL or DML inside a loop, and using a naive static Boolean for trigger recursion control (which silently skips records past the first 200 in bulk). Both are leading causes of governor-limit and data-integrity bugs in production.