Your CTO is right. Your job and his job is to provide value to customers fast to generate sales to justify the next round before you run out of money. There is no other goal. Saving on infra cost is marginal compared to saving on time. Your salary and other developers salary has more impact on the burn rate than infra costs. Being able to deliver your “killer features” on time is significantly more valuable to the company than saving infrastructure costs. When you are a mature company, then thinking about infra costs might be great to revisit. Too early now unless your business model is tied to infra costs and this has a direct pact on your bottom line.