Fazley RabbiSaaS, short for software as a service, is software that customers use through a browser or an app while you host it, maintain it and charge them on a regular basis, usually monthly or yearly. The code is only one part of it. Running a SaaS business also means billing people reliably, keeping the service online, answering support questions and improving the product, for as long as you have customers.
How SaaS differs from selling software once
Older software was sold like a book: a customer paid once, installed it on their own computer and used that version for years. With SaaS, nothing is installed. The customer logs in, the data lives on your servers, and everyone uses the same latest version.
A familiar comparison: buying your own generator versus paying a monthly line charge for power from a shared generator in your market. With the first, you own it and you repair it. With the second, someone else keeps it running and you pay for as long as you use it. SaaS is the second arrangement, and you are the one keeping the generator running.
That changes the business in three ways:
- Income arrives slowly, but it repeats. You earn a little from each customer every month instead of one lump sum.
- Customers can leave easily. If the service is down, slow or unhelpful, they simply stop paying.
- The work never finishes. Hosting, security updates and support continue every single month.
The parts of a SaaS business
The product
A focused tool that solves one clear problem for one type of customer. For example, a hypothetical attendance app for coaching centres, or a booking tool for diagnostic centres. The narrower it is, the easier it is to build, explain and sell.
Accounts and data separation
Many customers share one system, but each must see only their own data. Getting this right from the start (developers call it multi-tenancy) is one of the most important technical decisions, because a mistake here can show one customer's records to another.
Billing
You need plans, trials, invoices, reminders and a clear rule for what happens when someone does not pay. Many small businesses in Bangladesh are more used to paying by bKash, Nagad or bank transfer each month than to saving a card, so plan for manual renewals and payment reminders alongside any automatic option. A licensed payment gateway can tell you which recurring payment methods it actually supports.
Hosting, backups and monitoring
The service has to stay online at night and on holidays. That means proper hosting, automatic backups that you have restored at least once to prove they work, and alerts the moment something breaks.
Support and onboarding
Someone has to answer "how do I..." questions, help new customers bring in their old data and fix problems quickly. In a small SaaS business, that someone is often the founder.
Pros and cons of the SaaS model
| For you, the owner | For your customers | |
|---|---|---|
| Good | Repeat income, one version to maintain, you learn from real usage | Low starting cost, nothing to install, updates included |
| Hard | Slow early income, ongoing hosting and support costs, constant work to keep customers | Their data lives with you, they need internet, the payment never ends |
For customers in district towns with patchy mobile data, the last point matters. A product that works on a weak connection and an ordinary phone will beat one that only shines on office broadband.
Before you build: questions to answer
- Who exactly pays? Name the type of business and the person who approves the payment.
- What do they use now? A notebook, Excel, a WhatsApp group? Your product has to be clearly easier than that.
- Will they pay every month? Ask before you build. A handful of honest conversations will teach you more than a long feature list.
- Who handles support? Decide this before launch, not after the first complaint.
- What are the legal and tax questions? VAT, invoicing, data protection and selling to customers abroad all have rules. Ask an accountant and a lawyer rather than guessing.
Start small with the first version
The common mistake is building every feature before anyone has paid. A better path is a minimum viable product: the smallest version that solves the core problem well enough for a few real customers to use and pay for. You then improve it based on what they actually do, not on what you imagined. I explain this step in more detail in building a SaaS MVP without overspending.
When I plan a SaaS project, I first ask for two sentences: what the customer's problem is, and how they deal with it today. If either sentence is vague, it is too early to write code.
A short checklist before you commit
- One clear type of customer and one main problem
- Conversations with real prospects who said they would pay
- A billing plan that includes manual bKash or Nagad renewals
- Hosting, backups and monitoring counted as a monthly cost, not an afterthought
- A named person responsible for support
- Advice from an accountant and a lawyer on tax and data rules
If you are weighing a SaaS idea and want a second opinion on scope and build, see software and website development or get in touch.