What Is SaaS? Why Are Businesses Building Their Own SaaS Products?

In short: SaaS (Software as a Service) means using software that runs on the provider’s servers over the internet, usually from a browser and on a subscription; installation, maintenance and updates are the provider’s job. Businesses build their own SaaS products for three reasons: recurring revenue, scaling at a low marginal cost and turning the expertise they have built up in their industry into a product they can sell. But SaaS is not a one-off project; it is a product journey that cracks at the first growth spurt if multi-tenant architecture, subscription infrastructure and data security are not set up properly from the start.

Most of the tools you use today — email, accounting, design, project management — are very likely SaaS. Any software you use by logging in through a browser on a monthly subscription, instead of downloading and installing a program, falls under this model. So why has this model become so widespread, and why are more and more businesses building their own SaaS products?

What exactly is SaaS?

SaaS (Software as a Service) means renting software as a service rather than buying it as a product. The software runs on the provider’s servers; you access it over the internet and pay for as long as you use it.

The most widely cited definition of the concept is in NIST SP 800-145, published in 2011 by the US National Institute of Standards and Technology. Under this definition, with SaaS the consumer uses the provider’s applications running on a cloud infrastructure; the applications are accessed from a client such as a web browser or through a program interface. The consumer does not manage the network, servers, operating systems, storage or even individual application capabilities; the possible exception is limited user-specific configuration settings. The same document defines SaaS alongside two sibling models:

From the user’s perspective, the appeal is clear:

• No installation hassle — open the browser and it works; maintenance and updates are the provider’s job.
• Access from anywhere — office, home or phone; the data lives in the cloud.
• Predictable cost — a monthly, scalable subscription instead of a large upfront license.

The other side of the coin follows from the same definition: because you don’t manage the software, flexibility goes only as far as the provider allows, your data sits on their infrastructure, and payments continue for as long as the subscription does. We cover how to strike this balance for your own business in our article off-the-shelf or custom software.

Why are businesses building their own SaaS?

SaaS is attractive not only to use but also to build. There’s a strong business logic behind a company developing its own SaaS product:

1. Recurring revenue — a monthly subscription, instead of a one-off sale, creates a predictable and compounding revenue stream.
2. Scalability — a product built once can reach thousands of customers at a low marginal cost.
3. Turning expertise into a product — you can transform a problem you’ve solved in your own industry into a product you can sell to everyone facing the same problem.

A good SaaS turns your expertise into a source of revenue that works even while you sleep.

Is it the right time for your own SaaS product?

Not every good idea is a SaaS product. Before you start building, answer these questions:

• Does the problem recur? A problem only one customer has is a project; if dozens of companies have the same problem, it may be a product.
• Can the solution be standardized? If every customer needs separate development, what you have is agency work, not SaaS.
• Are people willing to pay for it regularly? The most honest way to validate the idea is to talk price with a few potential customers before the first version.
• Do you really know the industry? Starting in a field where you have expertise reduces your biggest risk: building the wrong thing.
• Do you have the resources to keep the product alive for years? Support, security and development continue after the first version.

One of the strongest starting points for a SaaS idea is a solution that already works inside your own company. A tool you built for an internal process has proven in daily use that it really solves the problem. The work of turning it into a product is to strip out one company’s habits, make it multi-tenant and simplify it enough for others to use on their own.

If you don’t have convincing answers to these questions, it is often wiser to first solve the problem inside your own company with custom software and leave productization for later.

Building SaaS is a product journey

Developing SaaS isn’t just writing software; it’s a product journey that requires subscription infrastructure, a secure multi-user architecture, payment cycles and continuous improvement. A SaaS built without a solid technical foundation cracks at the first growth spurt. These are the parts of that foundation:

Multi-tenant architecture and data isolation

In a SaaS product the same infrastructure serves many customers (tenants); the NIST definition also says resources are pooled to serve multiple consumers using a multi-tenant model. The critical question here is that one customer’s data must never be visible to another. AWS’s whitepaper on tenant isolation describes crossing this boundary in any form as a significant and potentially unrecoverable event for a SaaS business. Isolation is not a feature added later but an architectural decision made on day one, from database design to authorization.

Subscriptions, payments and pricing

Trial periods, upgrades and downgrades, retries for failed payments, invoicing and the cancellation flow matter as much as the product itself. Locking the infrastructure into a single pricing model turns a later change of model into a rewrite. We explain which model suits you in our article on SaaS pricing models.

Personal data and KVKK

If your customers will enter their own customers’ or employees’ data into your product, you are processing that data on their behalf. Article 12 of Turkey’s Personal Data Protection Law No. 6698 (KVKK) requires the data controller to take all necessary technical and organizational measures to provide an appropriate level of security, and where data is processed by another person on the controller’s behalf, makes the controller jointly responsible with that person for those measures. In practice, this means your corporate customers will ask you about access control, logging and data location before they buy. The answers should already be built into the product.

Identity, permissions and observability

Corporate customers expect user roles, activity logs and uninterrupted service. Logs showing who did what, error and performance monitoring, and backups should be part of the scope of the first version.

Continuous releases and support

With installed software, each customer runs their own version; with SaaS, everyone is on the same version and every update affects all customers at once. That is why automated tests, releases you can roll back and a support process that logs customer questions are not a luxury but a necessity.

A phased roadmap

1. Validate the problem. Talk to target customers and find out how they solve the problem today and what they pay for it.
2. Build a narrow first version. A product that solves one problem well, but with its multi-tenant structure and security set up properly from the start.
3. Learn from your first paying customers. Paying customers, not free users, show you the real priorities.
4. Prepare to scale. Automate billing, support, monitoring and sales processes before the customer count grows.

Common mistakes

• Building custom features for every customer. It brings sales in the short term and splits the product into dozens of versions in the long term.
• Leaving security and isolation for later. These are not details to add later; they are the foundation itself.
• Treating launch as the finish line. The real work of a SaaS starts after launch: feedback, improvement and keeping customers.

Built right, though, a SaaS moves your business from one-off projects to a sustainable revenue model. At Kodakod, we turn your SaaS idea into a complete product that is scalable, secure and backed by subscription infrastructure, and we stay with you from the first version through to growth. For details, take a look at our custom software and SaaS development page.