Kubernetes can reduce infrastructure constraints and increase your engineering costs at the same time.

When a Rails SaaS starts growing, EKS can look like the natural next step.

More control over deployments.
Better workload isolation.
Flexible scaling.
More control over infrastructure.

But the EKS bill is only one part of the cost.

You also need to account for:
- Cluster management and upgrades
- Monitoring and deployment tooling
- Security and networking
- Incident handling
- Engineering time spent maintaining the platform

Now compare that with a managed platform.

You may pay more per unit of compute, but spend less time managing infrastructure.

For a small team, that time can be more valuable than the infrastructure savings.

The real comparison is:EKS: More control, more operational responsibility.

Managed platform: Less operational work, but more platform constraints.

Neither is automatically cheaper.

For a Rails application with predictable workloads, a managed platform may be enough.

When you have complex workloads, specific networking needs, or a team capable of operating Kubernetes, EKS may justify the additional complexity.

Important learning:
Don't compare Kubernetes and managed platforms only by their monthly cloud bills.

Compare the total cost of running production, including engineering time, maintenance, incidents and operational risk.

Your team should spend its time building your product, not operating infrastructure it doesn't actually need.