20 Apex Interview Questions and Answers [After 10+ Interviews]
Summary
This comprehensive guide breaks down 20 real-world Apex interview questions encountered across 15 technical screens, focusing on practical issues like governor limits, bulkification, recursion prevention, sharing models, and async processing. It highlights not just the definitions but the reasoning interviewers seek, reflecting what truly matters in live Salesforce orgs—such as coping with platform limits, designing efficient triggers, and understanding transaction contexts. Salesforce developers can use this as a preparation and reference tool to align their answers with real interview expectations and sharpen their coding interview skills. It also includes uncommon and tricky questions that test deeper Apex knowledge and problem-solving under pressure.
Takeaways
- Design Apex code for bulk processing by avoiding SOQL/DML inside loops.
- Use static Boolean flags or Sets to prevent recursive trigger execution.
- Understand async Apex differences: @future vs Queueable vs Batch jobs.
- Explain Apex sharing models and recognize trigger system context behavior.
- Prepare real-world incident stories focusing on governor limits and recursion.
This post is contributed by Marcus Whitfield, a Salesforce Developer with 10 years of experience building Apex solutions across enterprise manufacturing, insurance, and financial services orgs. I was let go in January after my company restructured and I had not interviewed in years. Over the next 4 months I completed 15 technical screens, ranging from 200-person SaaS startups to multi-national enterprises with live Apex coding exercises, governor limit scenarios, and trigger design walkthroughs. The 20 Apex interview questions and answers below reflect exactly what I encountered, with the answers I gave and my honest read on what each interviewer was testing. Top 10 Most Frequently Asked Apex Interview Questions 5 Uncommon Apex Developer Interview Questions That Surprised Me 5 Tricky Apex Triggers Interview Questions Final Recommendations for Your Salesforce Apex Coding Interview Top 10 Most Frequently Asked Apex Interview Questions These came up in at least 10 of my 15 screens.