Apex for admins and analysts: when do you choose code?

Introduction

This article gives Salesforce admins, functional managers and business analysts guidance: when is Apex justified, and when should you stick with declarative (Flow)? We'll walk through the key choices, concepts and best practices — without unnecessary jargon.

What is Apex (in plain language)?

Apex is Salesforce's programming language. You use it to write custom logic that goes beyond what declarative tools like Flow, Validation Rules and Formulas can do. Apex runs on the Salesforce platform and is therefore subject to the same governor limits and security rules.

"Think of Apex as custom logic within Salesforce: you create your own rules instead of just using the standard buttons."

When do you need code?

Apex is valuable in situations where Flow falls just short. Recognizable examples:

Bulk operations

You need to process many records at once safely and performantly.

Complex business rules

Multiple decision paths or reusable calculations don't fit well in Flow.

Integrations and callouts

You need to make external calls at a moment when Flow can't (or isn't scalable).

Specific timing

You want exact control over before/after insert/update/delete behavior.

Performance and maintenance

Many Flows/subflows cause performance or management problems.

Reusability

You want to make logic reusable for Flow, LWC and other Apex.

"Always start with declarative (Flow) if you can. Use Apex when you must."

In our article on Automating with Salesforce Flow, we show how far you can get without code. This article addresses the situations where Flow falls just short.

Class vs Trigger (and why it should matter to you as an admin)

Trigger

Fires automatically on events on an object (insert, update, delete, undelete). Good for: "when something happens to this record, this should also happen".

Apex class

Reusable logic that you call yourself from a trigger, Flow, LWC or other Apex. Good for: splitting logic neatly, maintaining overview, keeping things testable.

Best practice: one trigger per object, which immediately delegates to an Apex class with the actual logic. This prevents spaghetti and keeps extending manageable.

Using Apex in Flows

Apex and Flow aren't competitors, but work together. From a Flow you can call an Apex Action. Useful when 95% of the process can be done in Flow, but one step just can't: a more complex calculation, bulking or an external callout.

This keeps your Flow simple for administrators, and you solve the difficult part reliably in Apex. In our article on GA4 event tracking with Flow, we show how to safely send data to an external system — sometimes a small piece of Apex makes the difference there.

Using AI / ChatGPT for Apex (with test classes)

Yes, you can easily have ChatGPT generate first versions of Apex classes. But you must always verify the business logic yourself: AI doesn't know your object model, validations and permissions. Also have AI generate a test class immediately (at least ~75% coverage, but especially meaningful asserts).

Ask for the class,
the test class,
and a brief explanation of the patterns used (e.g., service layer, bulkification).

"AI can help you be faster, not less critical."

Benefits & limitations of Apex

Benefits

More control over logic and sequence
Reusable, testable code
Better performance with bulk processing
Integrations with external systems

Limitations

Subject to governor limits
Deploy and testing required — not always 'just' in production
Maintenance and technical debt
Knowledge of the data model required

Apex isn't the solution for everything. Sometimes an extra Flow, a good validation rule or even a process agreement is faster and cheaper.

Conclusion

As an admin or analyst, you don't need to become a full-time developer to use Apex. But if you understand when code is needed, you'll make better choices and give better assignments to developers — or write a first version yourself with the help of AI.

Want to know if your automation would be better in Flow or Apex? Schedule a session with CRM Force.