B2B SaaS Platform: 38% AWS Cost Reduction in 90 Days

Client: Series B B2B SaaS company · 240 enterprise customers · ~$22M ARR

Engagement: 90-day FinOps optimization · January–April 2026

The Challenge

Their AWS bill had grown from $48K/month to $92K/month over 18 months — a 92% increase against only 35% revenue growth. The CFO had given the CTO a hard mandate: reduce cloud spend by 30% within one quarter, without compromising customer-facing performance or slowing engineering velocity.

Approach (Week-by-Week)

Sample: Idle EBS Volume Sweeper (Lambda)

import boto3
from datetime import datetime, timedelta, timezone

ec2 = boto3.client('ec2')
sns = boto3.client('sns')

def lambda_handler(event, context):
    """Find unattached EBS volumes > 30 days old."""
    cutoff = datetime.now(timezone.utc) - timedelta(days=30)
    response = ec2.describe_volumes(Filters=[
        {'Name': 'status', 'Values': ['available']}
    ])
    waste = []
    for vol in response['Volumes']:
        if vol['CreateTime'] < cutoff:
            monthly_cost = vol['Size'] * 0.10  # gp3 list price
            waste.append({
                'id': vol['VolumeId'],
                'size_gb': vol['Size'],
                'monthly_cost_usd': monthly_cost,
                'age_days': (datetime.now(timezone.utc) - vol['CreateTime']).days,
            })
    if waste:
        total = sum(v['monthly_cost_usd'] for v in waste)
        sns.publish(
            TopicArn=os.environ['ALERT_TOPIC'],
            Subject=f'Idle EBS waste: ${total:.0f}/mo across {len(waste)} volumes',
            Message=json.dumps(waste, indent=2),
        )
    return {'waste_count': len(waste), 'monthly_savings': total}

Results

“Ohveda’s FinOps framework gave us cost visibility we never had. The per-customer dashboard alone has changed how we price enterprise contracts.” — Arjun Mehta, CTO