Questions to ask a CTO candidate about cloud spend
Use questions to ask a CTO candidate about cloud spend with real invoices, growth assumptions, and simple checks to spot real cost judgment.
Why a low cloud bill can mislead
A low cloud bill does not prove a CTO made smart decisions. Sometimes the product is still small, traffic is light, and weak parts of the setup have not started to hurt yet. Infrastructure that looks cheap at 500 users can get expensive at 50,000 if the system depends on too many managed services, duplicate data stores, or wasteful background jobs.
Credits make this even harder to judge. A candidate may point to a tiny monthly bill, but that number means little if a cloud vendor covered half of it with startup credits or discount programs. When the credits end, the real cost shows up all at once.
The opposite problem shows up too. Someone says they
Frequently Asked Questions
What cloud bill should I ask to see?
Ask for three to six months of real invoices and the usage graphs that match them. Put the bill next to traffic, data volume, and the main services they used. A single low number without that context tells you almost nothing.
How do I check if credits hide the real cost?
Ask how much of the spend the company paid and how much credits or discounts covered. Then ask for the same month at full price. If they cannot show that number, you still do not know the real run rate.
What growth scenario should I ask them to model?
Use a simple growth case, like 10x more users, 5x more data, and more background jobs. A good candidate will tell you which costs rise slowly, which jump fast, and where they would change the design before the bill spikes.
Is a low cloud bill always a good sign?
No. A tiny bill can come from low traffic, delayed problems, or a system that cuts corners. You want low cost for clear technical reasons, not a number that looks nice today.
What setup choices usually waste money?
Watch for too many managed services, duplicate databases, always-on workers, and services that call each other too much. Those choices often look fine early on, then start burning money as load grows.
Should I ask about cost per user or per request?
Yes. Ask what it costs to serve one active customer, one order, or one thousand API calls. That answer shows whether they connect infrastructure decisions to the business, not just to server counts.
How can I tell architecture savings from vendor haggling?
Ask for two examples: one where they cut spend by changing the system design, and one where they got a better vendor deal. Design changes keep paying off as usage grows. Vendor discounts help, but they do not remove waste.
What numbers should a CTO candidate know without digging around?
They should know the biggest cost drivers, the current monthly run rate, the busiest load periods, and the rough cost of each environment. If they guess at all of that, they probably stayed too far from the numbers.
What should they say about reliability versus cost?
Look for a clear tradeoff, not a slogan. A solid answer explains where they spend more to avoid outages and where they keep things simple to save money. Cheap systems that break often still cost a lot.
What answers should make me worry?
Be careful if they speak only in percentages, avoid real invoices, or blame the cloud vendor for everything. You want someone who shows numbers, explains why they made each choice, and admits what they would change now.