Building your own SaaS product: multi-tenant, with self-service onboarding, subscriptions and compliance from day one. For founders and product leads who do not want to integrate a tool, but want to build and sell their own software to customers.
Setting up a SaaS product means building a single application that you sell, manage and continuously develop for many customers at once. That is fundamentally different from a one-off project: you are not delivering a single client a finished result, you are launching a product line that runs for years and must handle new users, new subscriptions and new functionality every month. Architecture, billing, support structure and compliance have to carry that from the very beginning.
We build custom SaaS for founders who want to keep control of their own product. No white-label template, no all-in-one platform that dilutes what makes your product distinctive, but your own codebase with a multi-tenant architecture, a billing layer that fits your pricing model and an onboarding flow that suits how your target audience buys. For the broader context of custom software across iOS, Android and web, see our page on app development, of which SaaS is a specific variant.
We work for clients in B2B software, professional services, specialist niches and regulated industries. For each combination of market, pricing model and compliance requirement, there is a different right answer to questions like "how many tenants will I have?", "how will I invoice?" and "where may the data be stored?". So the first conversation is not about framework choices, but about your customers and your business model. Technology comes after that.
Not every organisation starts from the same place. We work on SaaS projects with four recognisable profiles. If you see yourself in one of them, the tone of our conversation will probably feel right.
You have market insight, an initial design or a paying pilot customer, and now want to build a production-ready SaaS product that can scale. We work closely with the founder(s) and build from the business model back to the architecture.
Your organisation has already built something internally that would also be valuable to other businesses. We help turn the working prototype into a sellable SaaS, with multi-tenancy, billing, onboarding and the accompanying product marketing layer.
Your current platform has outgrown its original design: technical debt, an unmanageable billing flow, or multi-tenancy that was never quite finished. We build replacement components or a complete next-generation version, with a migration path for your existing tenants.
An industry body, umbrella organisation or professional association that wants to provide its members with a software product of their own. Often deep domain knowledge, sometimes regulatory requirements, and always a specific user group that you know better than any generic supplier.
A SaaS product breaks down into four layers, each of which needs its own attention: the product itself, the multi-tenant foundation, the commercial layer and operational management. We build them as one coherent whole.
The actual functionality your customers pay for: dashboards, workflows, integrations with their own systems. We work from user stories and business flows, not from a feature matrix. For the business variant, we also look at our approach to B2B apps, because SaaS for business users places different demands on onboarding, authorisation and integrations than a consumer app does.
How you run a hundred, or a thousand, separate customers on a single application without their data, performance or branding ever overlapping. Tenant isolation via Postgres row-level security or schema-per-tenant, per-tenant branding, feature flags and custom domains. For the full architecture discussion, see our separate page on a multi-tenant platform; that block is standard in every SaaS we build.
Creating, upgrading and pausing subscriptions, giving discounts, trials, annual contracts, measuring MRR, dunning and direct debit. We integrate with Stripe or Mollie, or build our own billing layer if your pricing model falls outside what they support. For heavier payment flows, such as marketplace payouts or complex SCA flows, we work from our approach to a payment platform.
A SaaS lives or dies by what happens after the first deployment. Tenant-aware monitoring, an audit trail per tenant, an admin console where your support team can intervene for each tenant, canary releases that let you show new features to a single pilot tenant first, and migrations without downtime. For the wider platform context, this fits within our approach to a digital platform; SaaS is one specific implementation of that.
A production-ready SaaS product, plus everything around it needed to run, sell and develop it yourself. No black box, and no vendor lock-in on an architecture only we understand.
You receive the full codebase under your own control, running on a cloud account in your name, with documentation that helps your own team or any future partner carry on. We work with a mindset of portability: the software should keep working without us.
Not everything that comes in as a "SaaS idea" is a good starting point for a platform of your own. Here are four patterns in which a custom SaaS really pays for itself.
Existing software in your market feels too broad, too foreign or too expensive. You have a more specific answer, and your first pilot customers confirm it: the pain is concrete and the willingness to pay is there.
Your current services are project-based, and you want predictable monthly income. A SaaS product with subscriptions is then a rational move, provided you accept that the business model takes years to mature.
A tool is already running within your organisation that colleagues or sister companies use every day. That is the best starting point for a SaaS: proven value, a live target group and a first roadmap that comes from actual use, not from a spreadsheet.
The large SaaS players focus on broad, horizontal problems. Your market is vertical or subject-specific, and there specialist knowledge beats breadth. Your own SaaS product is often a lasting, defensible position there.
With OneDayBuild, we turn your idea into something tangible in one day for €1,150, so you can see whether further development is worth the investment. Decide to go ahead with the full build? Then we credit the full cost.
Explore OneDayBuild →We are not dogmatic about a single stack. The choice of framework, database and cloud provider depends on what your team already knows, the scale we expect and which compliance requirements apply. For SaaS we usually build in TypeScript on Node, with a React or Astro frontend and Postgres as the database, as that is where most of the community, the best talent and the most proven multi-tenant patterns are.
For data residency we work by default with EU regions; for stricter compliance requirements we can build on a Dutch provider such as TransIP or Hostnet. We build vendor-independent: you get code that can also run on another cloud if you want to move in years three or five. No architecture that only works on one proprietary platform.
A no-obligation conversation to understand what you want to build, for whom, and with which business model. No pitch, but we will probe the assumptions that will shape the architecture: who your first tenants are, what the pricing model looks like, and which compliance requirements are realistic from day one.
A short working period in which we sharpen the scope: which functionality belongs in version one, which we deliberately leave for later, and which architectural choices are fixed. At the end you receive a substantiated plan with a working screen flow, a chosen multi-tenant approach and a first pilot tenant.
A working build every sprint, with the multi-tenant foundation, billing and core functionality added step by step. We test early with several test tenants to rule out data isolation issues, billing edge cases and onboarding flow problems before going live with real customers.
First one pilot tenant goes live, with a direct feedback line to your product team and to us. Then a second and third, and then broadly. This keeps incidents small, lets your own team learn along the way, and hardens the onboarding flow in practice rather than on a spreadsheet.
Ongoing management for security patches, monitoring and stability, plus a product roadmap that evolves alongside your customers. SaaS is a product, not a project. We work to a release rhythm that suits how quickly your market and your team move.
What founders and product leads usually want to know before starting a SaaS project.
A free, no-obligation half-hour introductory call. We listen to what you want to build, ask follow-up questions about the business model and the tenant realities that matter, and give direction you can use, even if the honest advice is not to start building your own SaaS just yet.
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