Here's a real story: a developer's account was normally at $100/month. In two days it jumped to $4,000. He went to Reddit for help. The top upvoted comment? Read the shared responsibility model.

Not exactly helpful.

These stories are everywhere - Reddit, Hacker News, Twitter. $14K bills. $120K bills. And the thing is, every single one of them was preventable.

Here are the 5 mistakes and how to fix them.

Mistake 1: No Billing Alerts

AWS won't stop you from spending. If you don't set up alerts, you'll find out about a cost spike when your credit card statement arrives.

Three fixes:

• Create a zero-spend budget. Go to Billing → Budgets → Create Budget. You'll get notified the moment anything is charged.
• Activate Cost Anomaly Detection. It's free. Detects unusual spending patterns and emails you automatically.
• Send alerts where you actually read them. Route to Slack, Teams, or Discord. Nobody checks billing emails.

Mistake 2: Using the Root User

The root user can do literally everything. Close the account, change billing, create backdoors. One developer had a 20-character password, no MFA. Still got hacked. Attackers spun up Bitcoin mining rigs in a hidden region.

Four fixes:

• Enable MFA on root. Use a hardware key if possible.
• Create an admin IAM user. Use this for daily work. Never touch root again.
• Lock root away. Only CTO/founders. Use a distribution email list.
• CloudTrail alerts for root logins. Get immediate alerts via EventBridge → SNS → Slack.

Mistake 3: Single AWS Account

Dev and prod in one account? A developer runs a load test, hits the Lambda concurrency limit, and production goes down too. AWS doesn't know about your "environments." The account is the boundary.

The fix: Create an AWS Organization with two accounts. One prod, one dev. Your blast radius drops dramatically.

Mistake 4: No Tagging

The most boring mistake on the list. Also the one I see every single time. Without tags, you know costs are going up but not why. Which project? Which team? You're guessing.

Two steps:

• Activate cost allocation tags. Free. Go to Billing → Cost Allocation Tags.
• Tag your resources. Minimum two tags: project and owner.

Mistake 5: No Infrastructure as Code

If you're clicking resources together in the console, stop. ClickOps works for you once. It doesn't work for a second environment, a new developer, or a rollback.

Pick one tool and commit to it. Terraform, CDK, Pulumi, SST. The worst IaC tool is still better than ClickOps.

And this ties everything together: billing alerts, CloudTrail rules, multi-account setup, tagging - all of it can be defined in code.

Fix all five and your account is ahead of 90% of the ones out there. Start with number one. It takes a couple of minutes.

🎬 Watch the Video →