Contents
- Define the product before selecting technology
- Choose an MVP that completes a task
- Decide how customer organizations are separated
- Choose architecture the team can operate
- Connect subscriptions, payment and access
- Budget for development and ongoing operation
- Use evidence to approve launch
- Expand using evidence from real use
Custom SaaS development creates software operated as a service for multiple customer organizations. The project includes the application, customer onboarding, access rights, subscriptions and day-to-day operations. To prepare an initial launch, start with the workflow a customer must be able to complete and pay for.
Define the product before selecting technology
Describe a target customer, a recurring problem and an observable outcome. For example, a software publisher might help service businesses receive a request, schedule a visit and deliver a report. This is a scoping example, not a project attributed to Daillac.
Identify the buyer, users and account administrator. They do not always have the same needs. A manager might pay for a team without performing its daily work. Separate the purchasing journey, the business workflow and account administration.
Two different decisions
If you need a tool for your own operations, our existing SaaS versus custom application comparison addresses that choice. This guide covers building and operating a SaaS product.
Choose an MVP that completes a task
A minimum viable product, or MVP, is a first version complete enough to test a real use case. Reduce the number of workflows, while keeping essential controls. A prototype can simulate payment; a product sold to customers needs to handle real account states and incidents.
TableAn example of an initial product scope · shareable block
| Usable first delivery | Later expansion to validate | |
|---|---|---|
| Customer onboarding | Create an organization and invite authorized users. | Import large histories and customize every journey. |
| Business task | Complete one priority workflow and view its outcome. | Add process variations and advanced capabilities. |
| Subscription | Apply a simple plan with explicit payment states. | Add more pricing options and usage models. |
| Support | Understand an error and contact support with a reference. | Build an advanced help centre and analytics. |
Assign a validation owner and an acceptance test to each capability. A feature that does not support the first workflow, its billing or its reliability can stay in the expansion backlog. An application requirements checklist helps make the scope explicit.
Decide how customer organizations are separated
A customer organization in a SaaS product is often called a tenant. Its identity and the user’s permissions must accompany data access. A signed-in account must never gain access to another organization’s records simply by changing an address or identifier.
The AWS tenant isolation guide describes several strategies. Resources can be shared or isolated further, depending on requirements. Make the trade-off between operations, cost and isolation explicit.
TableIsolation decisions to document · shareable block
| Shared option | More isolated option | |
|---|---|---|
| Data | Shared tables or services with organization-level controls. | Separate databases or resources for selected organizations. |
| Operations | Common updates and usage monitoring by customer. | Separate deployments or capacity that need maintenance. |
| Validation | Test cross-tenant access in queries, files, search and background jobs. | Also test incorrect routing between environments. |
The decision extends beyond the database. Include attachments, exports, caches, logs and background processing. Support staff also need limited, traceable access when working on customer accounts.
Choose architecture the team can operate
An initial SaaS can use an application organized into modules rather than many independent services. Validate that choice against workload, isolation requirements and the available team. Separate services add communication, deployments and failure modes to manage.
Document the boundaries between the application, data, files, background jobs and external services. Long tasks, such as large imports, need a visible status and a recovery path. An email failure should not stop the entire business workflow.
- Keep a test environment separate from production.
- Define administrative access and secret management.
- Provide backups and test restoration.
- Monitor errors and the costs of external dependencies.
- Record who can deploy, diagnose incidents and roll back a release.
Connect subscriptions, payment and access
Define account states such as trial, active, overdue, suspended and closed, according to the offer. Specify how each state affects data, invitations and permitted actions. A successful checkout page does not describe the full subscription lifecycle.
With Stripe, payment webhooks can arrive more than once and without a guaranteed order. Verify their signatures and design processing to handle both conditions. The browser’s return from checkout should not be the only evidence used to grant access.
Test a declined payment, a delayed notification, a plan change and cancellation. Support staff must be able to understand the effective account state and explain the customer’s next step.
Budget for development and ongoing operation
Separate the initial investment from recurring expenses. The first includes discovery, interfaces, architecture, development and acceptance. Recurring expenses include hosting, external services, support, fixes and product improvements.
TableQuestions for a SaaS estimate · shareable block
| Assumption to specify | What can change the cost | |
|---|---|---|
| Users and organizations | Accounts, roles and concurrent users covered by testing. | More permissions, workflow variations or actual load. |
| Data and exchanges | Volumes, retention, imports and integrations included. | Difficult migration data or undocumented dependencies. |
| Subscriptions | Plans, currencies and plan-change rules included in the delivery. | New commercial rules or payment methods. |
| Operations | Monitoring, backups, support and ownership. | Higher availability requirements or support demand. |
Track fixed expenses separately from costs driven by usage. A useful indicator is service cost per active organization, with a clear list of included expenses. Fixed costs weigh more heavily at low volume; a calculation based on a large customer base does not describe the start of the project.
Request workload and scope assumptions rather than a price without conditions. An estimate can propose several deliveries and identify exclusions. The launch budget should also cover onboarding and support for the first customers.
Use evidence to approve launch
The production decision should use observable criteria. OWASP ASVS can guide technical security verification. Combine that work with business tests, cross-tenant access tests and operating procedures specific to the product.
- Two test organizations complete the workflow without seeing each other’s data.
- Invitations, revocations and role changes produce the expected access.
- Subscription states and payment errors are handled correctly.
- An interrupted task resumes without repeating a completed operation.
- A backup has been restored and the responsible people know the procedure.
- Support can locate an incident and communicate the next step.
Expand using evidence from real use
Measure whether new customers finish the priority workflow, where they stop, which errors occur and why they contact support. Registration does not prove adoption. Before adding a feature, check whether it removes an observed obstacle or serves a clearly identified customer segment.
Daillac can support custom web application development. Bring a target workflow, sample data, an initial commercial offer and operational requirements. Those requirements also inform the approach to hosting and operations.
Custom SaaS development questions
Does SaaS require a separate database for every customer?+
Not necessarily. Several models are possible. Document the choice according to isolation needs, cost and operating capacity. Cross-customer access controls need testing in every model.
What should a SaaS MVP include?+
One complete business workflow for an initial customer segment, with the access, billing and support needed to operate it. The scope can be small while remaining usable.
How much does custom SaaS development cost?+
Cost depends on workflows, permissions, integrations, migration and operating requirements. A useful estimate separates launch deliverables, assumptions and recurring expenses.
Do we need microservices from the beginning?+
No. They are not a condition for building SaaS. An application organized into modules may suit an initial scope. Separate services should address an identified need and remain manageable for the team.
Can an internal CRM become a SaaS product?+
It is possible in some projects, but organization-level permissions, configuration, subscriptions, support and historical data need review. The CRM development guide helps document the initial business workflow.
Plan an initial SaaS delivery
Describe the target customer, the workflow to complete and the initial offer. This helps us scope deliverables, risks and the next decisions.
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