Com2us Platform · FinOps

Dragon Sky FinOps: 62% lower infrastructure cost

Linked revenue metrics with infrastructure cost and found unused resources automatically every day with Python, cutting infrastructure cost by up to 62%.

Role: Cloud Engineer · Main engineer
Period: Feb 2023 – Feb 2026
Cloud: Azure
Scale: 10 servers · 5 databases
Key tech: Azure · Python · Billing monitoring

- 62 %
Maximum infrastructure cost reduction: 10
Servers: 5
Databases

At a glance

Infrastructure cost fell by up to 62%.

Problem

Infrastructure cost was high relative to game revenue, which hurt profitability.

Approach

Revenue metrics and infrastructure cost were monitored together. Python found unused resources across every cloud automatically each day.

Result

Infrastructure cost fell by up to 62%.

Up close

The result becomes a cleanup list that stops cost leaks.

What this code does: AWS code that finds unattached IPs and security groups. This is code from a related public repository, not the production code of this project.

    for account, region, client in provider.regional("ec2"):
        base = {"cloud": "AWS", "project": account.name, "project_id": account.account_id, "region": region}
        for address in client.describe_addresses()["Addresses"]:
            if not address.get("InstanceId") and not address.get("AssociationId"):
                label = (
                    f"{_name(address)} ({address.get('AllocationId')} / {address.get('PublicIp')})".strip()
                )
                records.append(UnusedResource(resource_type="IP", resource=label, **base))
        for group in client.describe_security_groups()["SecurityGroups"]:
            if _excluded(group["GroupName"], rules):
                continue
            used = client.describe_network_interfaces(
                Filters=[{"Name": "group-id", "Values": [group["GroupId"]]}]
            )["NetworkInterfaces"]
            if not used:

What I learned

Seeing cost next to revenue made it easier to decide which resources affect profitability.

What I would improve

Next, I want a flow from detection through cleanup approval, so cost leaks close faster.