Should You Build Your Own Cloud Optimization Tool?

Every engineering team has said it at some point: "We could build that."

The build approach can seem like a good idea at first. A Power BI dashboard here, a rightsizing script there, a few jobs pulling from AWS Cost Optimization Hub. Within a quarter, you can create a decent solution to see where the waste is.

But seeing waste and safely removing it are two very different problems. The first version of the tool is easy to build. Making it safe enough to act on production, and keeping it running, is where the engineering cost actually lives.

It's probably no surprise that we at Sedai think buying is the better choice for most teams. After all, we do sell the thing you'd be buying. But we’re also engineers, and recognize that building isn't always wrong. If your footprint is small, your workloads are stable, or you only need visibility rather than action, a dashboard and a few scripts may be all you need. The same goes for a test environment, where a bad change costs little. The math changes when you need to act on production, at scale, across more than one platform. That's the situation this post is about.

The first version is the cheap part

Homegrown optimization tools usually start for good reasons. You have talented engineers. You know your environment better than any vendor. You want control.

And the tool often does exactly what it was built to do. The question isn't whether your team can build it. It's whether building and running it is the best use of their time, and whether it can ever safely move from reporting to action.

The costs nobody puts in the budget

Engineering time spent maintaining an internal optimizer rarely shows up as a line item. So it looks free. But it isn't.

These costs compound. One enterprise we worked with had more than 10 engineers keeping their homegrown tool running before they decided to look at a platform instead.

Low utilization doesn't mean safe to cut

Most internal tools follow a simple rule: if CPU and memory are low, size it down.

That works until it doesn't. Two services with identical utilization can react completely differently to the same change. A service that spikes on startup, shifts to batch work overnight or peaks at month-end looks oversized most of the time, right up until you trim it.

Safe optimization requires understanding how each application actually behaves: its traffic patterns, dependencies, seasonality and golden signals like latency and error rate. Sedai learns all of this per workload and keeps relearning as code and traffic change.

Building that yourself means a behavioral model for every service, correlation of every change with its performance impact, and continuous retraining across hundreds or thousands of services. That isn't a script. It's a product, and it needs a product team.

The waste keeps moving

A homegrown tool is built against today's waste. For most teams, that means CPU and memory on VMs and Kubernetes. But the fastest-growing source of spend is somewhere else: AI.

According to the FinOps Foundation's State of FinOps 2026, 98% of FinOps teams now manage AI spend, up from 31% two years earlier. Many are also being asked to self-fund AI investments through optimization savings, so efficiency work and the AI budget are now the same conversation.

AI spend doesn't sit in one place, either. In the Tokenomics Foundation's State of Tokenomics survey of 472 enterprises, half of AI consumers spread their usage across four of six procurement and hosting channels, and nearly a third run on rented cloud GPUs. Respondents also expect to shift toward open-weight models over the next year, which tends to put more of that spend on infrastructure they run themselves.

GPU workloads break the assumptions most internal tools are built on. GPU utilization is harder to read than CPU, idle allocations hide inside clusters, and the default is to leave expensive capacity running just to be safe. Every new model, accelerator or serving platform is one more thing your tool has to learn.

That turns building into a permanent R&D commitment, not a one-time project. Sedai already brings the same application-aware, safety-first approach to AI infrastructure. GPU Optimization identifies idle allocations, right-sizes workloads and packs GPU capacity, with the same gradual path to autonomy described below.

Skip the Build. Start Saving.

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Safety is the product

Here's the real reason cloud savings go unrealized: an incident is career-impacting, and a smaller cloud bill isn't. So engineers pad resources, and recommendations sit untouched.

Homegrown tools tend to handle safety one of two ways. A human reviews every change, which caps how far you can go. Or safety depends on whatever judgment the original builder encoded. Neither scales.

Sedai is safe by design:

• SLO-governed. It won't make a cost-saving change that would breach your service-level objectives or policy limits.
• Incremental. Changes happen in small steps, not big-bang resizes.
• Validated. Latency, errors and availability are checked after every step.
• Reversible. If performance degrades, Sedai rolls the change back automatically.

That closed loop is what makes it possible to optimize production with confidence. Sedai has executed more than 25 million autonomous actions in production with zero incidents.

Analysts have noticed, too: GigaOm named Sedai a Leader and Outperformer in its 2026 Radar for Kubernetes Resource Management.

Years of patented R&D you'd be starting from scratch

Sedai holds eight U.S. patents on taking autonomous action safely in production, covering reinforcement learning that learns from real outcomes and the safety mechanisms that govern every action.

We've been building this since 2018, and every action feeds back into the models. An internal team starting today begins with no outcome history, no library of edge cases and no proven safety framework. Catching up takes years, and the target keeps moving.

Do the math

The honest comparison isn't "Sedai's price vs. zero." It's the fully loaded cost of building and running your own tool against what each option actually saves.

Build cost per year = (number of engineers × fully loaded cost per engineer) + on-call and opportunity cost

Say three engineers build and maintain your optimizer at a fully loaded $250,000 each. That's $750,000 a year before a single dollar is saved, and before counting the weekend pages or the features those engineers didn't ship.

Sedai customers typically see savings of 3x or more the cost of the platform. A homegrown tool starts in the red and stays there until it saves more than the team running it costs.

You don't have to go all in

Buying doesn't mean handing over your whole estate on day one. Sedai lets you start small and expand as trust builds:

1. Datapilot: read-only recommendations your team reviews and implements.
2. Copilot: Sedai proposes, your team approves with one click, Sedai executes safely.
3. Autopilot: Sedai optimizes autonomously within your SLOs and policies.

Many teams start in Copilot on a handful of non-production services, promote proven workloads to Autopilot, then extend to production. Because Sedai already covers Kubernetes, VMs, serverless, storage, data and AI workloads, expanding is a configuration change, not another build.

That's how KnowBe4 rolled out Sedai: autonomous optimization on low-risk services first, then across all of its AWS accounts and regions.

Five questions to ask before you build

1. How many engineers will build and maintain this, and what do they really cost?
2. What happens when the person who built it leaves?
3. Will it cover every cloud and workload type, or just the first one?
4. How will it know a change is safe for a specific application, and how will it undo one that isn't?
5. What would those engineers ship instead?

The bottom line

Sure, your engineers can build an optimization tool. The real question is whether you want them maintaining one for the next five years. And whether you want a tool that identifies savings, or one that actually realizes them.

If you'd rather they get back to building your product, see how Sedai works.