B2B SaaS product team
We build multi-tenant B2B SaaS products end to end, from the first MVP to a product that scales.
If you are turning your own process into a product other companies will pay for, you need more than an app. You need multi-tenancy, subscription billing, onboarding and the scaling to serve hundreds of customers on one codebase. As a SaaS development company, we build all of it, with the scope agreed up front and the project source code yours on full payment.
Direct answer
SaaS development is building a multi-tenant web application that many customers use over the internet under a subscription. The hard parts are not the screens, they are tenant isolation, subscription billing and the architecture that lets you add a customer without deploying anything new. Timeline Digital builds B2B SaaS products end to end, with options such as Next.js, NestJS and Stripe chosen in the Select Technology step. Every build starts with a free pilot of your core modules, and the project source code transfers to you on full payment.
What every build includes
Which SaaS page do you need?
This page is the overview: architecture, tenancy, billing and running a SaaS business. Two pages go deeper.
For founders and teams taking a new product from idea to a first paying release (v1).
SaaS product developmentFor the platform capabilities themselves: multi-tenancy, subscriptions, user management and dashboards, including turning an internal system into a commercial platform.
SaaS platform developmentMulti-tenancy is the difference between a SaaS product and a website you redeploy for each client. One running application serves every customer, while each customer data stays separate and private. Most products share a single PostgreSQL database with a tenant column and row-level security. Products with strict compliance needs get a schema or a database per tenant for hard separation.
We design the tenant boundary in the data layer before any feature is built, because retrofitting it after launch means rewriting the core. On top of that boundary sit the things every B2B SaaS needs: a self-serve signup, role-based permissions inside each tenant, an owner who can invite and remove users, and an admin view for your own team to support customers without breaking isolation.
The tenancy model decides your running effort, how strongly customers are separated, and what you can offer enterprise buyers. Changing it after launch means migrating every tenant, so it is settled in the Plan step.
| Model | How it works | Fits best when | Trade-offs |
|---|---|---|---|
| Shared schema | All tenants share the same tables. Every row carries a tenant ID, enforced in the data layer, for example with PostgreSQL row-level security. | Most B2B products with many small and mid-size customers. | Lowest running and operational effort. Isolation depends on enforcement being right everywhere, so it is tested deliberately. Restoring one tenant, or hosting one tenant in a specific region, is harder. |
| Schema per tenant | One database, with a separate schema for each tenant. | A smaller number of larger tenants who want stronger separation or some per-tenant customisation. | Every release migrates every schema, so deployments need more care, and practical limits on tenant numbers are reached sooner. |
| Database per tenant | Each tenant gets its own database, which can sit in a region the tenant requires. | Enterprise or regulated customers who need hard separation, per-tenant backup and restore, or a specific hosting region. | Highest running and operational effort: more databases to patch, monitor, back up and migrate. Often offered as a premium tier rather than the default. |
Many products mix models: a shared schema by default, with a dedicated database for the few customers who require it.
A first release that does one job well gets paying customers and real feedback sooner than one that tries to do everything. This is the usual boundary; yours is agreed in writing in the Plan step.
Any of the later items can move into v1 when your launch market needs it, for example enterprise SSO if your first customers are large companies. Anything outside the approved scope is reviewed and agreed before extra work begins.
Every stage a customer account goes through is designed and tested, not only sign-up. Retention periods and what counts as personal data are your decisions as the product owner; we build the mechanics to support your terms and privacy obligations.
A new tenant, its owner account and default settings are created automatically, with no deployment.
Trial limits, reminders and the switch to a paid plan, driven by billing events.
Plan changes, seat changes, invoices and support access, all logged.
After a failed payment, a grace period, then read-only access rather than an instant lock-out.
The tenant can export its data in a documented format such as CSV or JSON before access ends.
Data is deleted after the retention period in your terms, and backups age out on the schedule you set.
A provider such as Stripe handles card payments, invoices, retries and tax calculation options. It also sets limits you have to plan around: the countries and currencies it supports, the payment methods your customers can use, its fees, the business types it accepts, and its own API changes.
We keep entitlements, meaning what each tenant may use, inside your product and update them from billing events, with a scheduled check against the provider. A delayed webhook then cannot lock out a paying customer or unlock a lapsed one. The billing account is opened in your company's name.
These depend on your tenants, usage and providers, so we list the categories here rather than amounts. The Plan step identifies the ones that apply to your product.
Custom software built around the way your business works. For SaaS, Plan settles the multi-tenant data model, tenant isolation, billing model and roles; the pilot builds your core product flow first; and Build & Scale adds signup, billing, onboarding and the admin dashboard, with a working demo at the end of every sprint.
We learn how your business works.
Your requirements, workflow, challenges and goals, understood before anything is recommended.
We design the right solution around your workflow.
Modules, workflows, roles, approvals, reports and integrations, agreed before development.
Choose the right technical foundation.
Technology options matched to your users, security, budget and growth, not one fixed stack.
Test our work before full project development.
Free. You choose 2 to 3 key modules and we build them first, so you can judge our work.
The full project starts only after you approve the pilot.
From approved pilot to complete digital system.
Full development, testing, deployment, training and support, built to grow with you.
Next.js and React with TypeScript. Server-side rendering keeps dashboards fast and marketing pages indexable in one codebase.
NestJS on Node.js, or ASP.NET Core for high-throughput transactional products. Clean module boundaries so the product can grow without a rewrite.
PostgreSQL with row-level tenant isolation, or a schema-per-tenant model when a customer needs hard separation for compliance.
A billing provider such as Stripe for subscriptions, metered usage, trials, proration and dunning. Webhooks wired to your entitlement logic so access matches what a customer pays for.
Per-tenant accounts, role-based permissions, SSO and audit logging. The tenant boundary is enforced in the data layer, not just the UI.
Docker on AWS, Azure or GCP, with CI/CD, automated backups, Sentry error tracking and uptime monitoring from day one.
Redis for caching and queues, background jobs for heavy work, and horizontal scaling patterns added when real load needs them, not before.
A senior product team: full-stack engineers, a designer, QA and a product owner who stays with you from MVP through scale.
Before you commit to the full project, we build 2 to 3 of your key modules as working software, free of charge. Your team tests the pilot, and the full build starts only after you approve it.
See how the free pilot worksWe learn your requirements and how your organisation works today.
Together we choose 2 to 3 key modules that prove the solution.
We build those modules as real, working software, free of charge.
Your team uses the pilot. The full project starts only after you approve it.
In-depth, practical reading for teams planning this kind of project.
A SaaS development company builds software that many customers use over the internet under a subscription, rather than a one-off app for a single business. The work covers multi-tenant architecture, subscription billing, onboarding, admin tools and the scaling needed to serve hundreds of customers on one codebase. Timeline Digital builds B2B SaaS products end to end, from the first MVP through to a product that scales.
Multi-tenant architecture means one running application serves many customers, called tenants, while keeping each tenant data separate and private. Most products share one database with a tenant column and row-level security; products with strict compliance needs get a schema or database per tenant. Multi-tenancy is what lets a SaaS add a new customer without deploying a fresh copy for each one. We design the tenant boundary up front because retrofitting it later is slow and risky.
It depends on the scope. A focused MVP covers tenant signup, subscription billing, the core product flow and a basic admin dashboard, and it moves fastest when the scope is kept tight to the one job the product must do first. Adding integrations, mobile apps or advanced analytics extends it. We agree the scope and the target dates in writing during the Plan step, and the free pilot builds your core product flow first so you see real progress before committing.
We usually build billing on a provider such as Stripe, which handles subscriptions, free trials, metered usage, proration when a plan changes, and automatic retries when a card fails. The important part is wiring the provider's webhooks to your entitlement logic, so what a customer can access matches what they pay for. We also build the self-serve flows customers expect: upgrade, downgrade, cancel and invoice history. The billing account is opened in your company's name, and its supported countries, payment methods and fees are part of the plan.
Build a SaaS product when the software itself is the business you are selling, or when no existing tool fits the workflow you want to offer customers. Buy off-the-shelf for commodity internal needs like email or accounting. If you are turning your own process into a product other companies will pay for, that is a custom SaaS build. See our broader guidance on custom software development for where the line sits.
Most B2B products start with a shared schema, where every row carries a tenant ID enforced in the data layer, because it has the lowest running and operational effort. A schema per tenant suits a smaller number of larger tenants who want stronger separation. A database per tenant suits enterprise or regulated customers who need hard separation, per-tenant restore or a specific hosting region, at the highest operational effort. Many products mix them: shared by default, with dedicated databases for the few customers who require it. The choice is made in the Plan step, because changing it after launch means migrating every tenant.
Usually tenant sign-up and onboarding, the one core workflow customers pay for, roles inside a tenant, subscription billing for the launch plans, an internal admin console, and audit logging, backups, monitoring and a tenant data export. Several pricing models, enterprise SSO, native mobile apps, a public API, white-labelling and advanced analytics usually wait for later releases unless your launch market needs them. The exact boundary is agreed in writing in the Plan step.
Hosting, databases and storage that grow with tenants and data; billing provider fees on each transaction; email and SMS delivery; monitoring, logging and error tracking; backups; third-party APIs and AI model usage if the product uses them; app-store accounts if there are mobile apps; and support and maintenance after launch. The amounts depend on your usage and providers, so the Plan step lists the categories that apply to your product.
Yes. We build multi-tenant SaaS platforms for UK founders and companies, delivered remotely, built to be hosted in the UK or EU where required and designed to support your GDPR obligations; compliance remains your organisation's responsibility. You get subscription billing, tenant isolation, an admin dashboard and onboarding flows, with the project source code yours on full payment. Our custom software development company in the UK service covers the wider UK offer.
Bring us the idea and the one job it must do first. We will map the architecture, agree the first modules with you, and build your core product flow first as a free pilot. The project code is yours on full payment.
For internal operations rather than a customer-facing product, see how we build ERP systems.
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