Day 14: Scheduling AWS Lambda with EventBridge (The Serverless Cron).

Source: Dev.to | Jan 09, 2026 (UTC)

No more manual triggers
Welcome to Day 14. Our Financial Agent works, but manual execution is not scalable. Today, we automate it using Cron Expressions in AWS.

The Tool: EventBridge Scheduler

Formerly known as “CloudWatch Events”, this service allows you to trigger targets on a schedule.

The Setup

Go to EventBridge -> Scheduler -> Create Schedule.

Define Pattern: I used a Cron expression to run it every day at 8:00 UTC (9:00 AM my time).

Syntax: cron(0 8 * * ? *)

(Minute Hour DayMonth Month DayWeek Year)

Select Target: Choose AWS Lambda -> FinanceAgent-Brain.

Permissions: Let EventBridge create a new role to invoke the function.

Code Changes?

None! That’s the beauty of it. The Lambda function doesn’t care who invokes it (me clicking a button or a robot on a schedule). It just executes.

Now the system is fully autonomous. Next stop: Building a UI!