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How We Reduced a Client's Cloud Bill by 40% (Case Study)

Published2026-01-26
AuthorDevopsteam
Tags
Case StudyCost OptimizationAWSFinOps

The Situation

A Fintech startup reached out to us. Their AWS bill was $12,000/month and growing.

They were profitable, but burning $144k a year on infrastructure felt wrong for their size. They wanted a 20% reduction. We gave them 40%.


Step 1: The "Zombie" Resources ($2,000/mo saved)

We ran a simple audit and found:

  • Unattached EBS Volumes: Hard drives from terminated instances still sitting there.
  • Old Snapshots: Daily backups from 2 years ago that no one needed.
  • Idle Load Balancers: Pointing to dev environments that didn't exist anymore.

Action: Delete. Delete. Delete.


2. The NAT Gateway Trap ($1,500/mo saved)

They had 3 environments (Dev, Staging, Prod). Each had highly available NAT Gateways across 3 availability zones.

3 Envs * 3 AZs = 9 NAT Gateways.
Price per hour + Data processing fees = $$$$

Action:
1. Removed NAT Gateways in Dev/Staging (used public subnets with strict security groups instead).
2. Reduced Prod to 1 AZ NAT Gateway until traffic scaled.


3. Right-Sizing Compute ($1,200/mo saved)

Their developers loved m5.2xlarge instances. "It's faster," they said.

CloudWatch metrics showed average CPU utilization was 4%.

Action: Downgraded to t3.medium and m5.large. No performance impact observed.


The Result

Old Bill

$12,000 / mo

New Bill

$7,200 / mo

That is $57,600 saved per year. That's almost half a junior engineer's salary.

Think you're overpaying?

Most startups are overpaying by 30% or more. Let us find your wasted spend.

👉 Book a Cost Audit.

Contact Devopsby.me today.

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