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. We build all of it, with the scope agreed up front and the source code yours on delivery. See what a build costs in our custom software development cost guide.
What every build includes
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 at near-zero cost. Timeline Digital builds B2B SaaS products end to end on Next.js, NestJS and Stripe. A focused MVP takes about 12 weeks, runs from $15,000 to $35,000 against a fixed scope, and ships with the full source code in your hands.
Multi-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.
Four phases. A working demo at the end of every sprint, not a big reveal at the end.
We pin down the one job your SaaS must do first, design the multi-tenant data model, and decide tenant isolation, billing model and roles before any feature is built. You sign off the scope and the architecture in writing.
A clickable Figma prototype of the core flows, reviewed and approved before backend work starts. This surfaces permission rules and edge cases while they are still cheap to change.
Two-week sprints with a working demo at the end of each. Tenant signup, subscription billing, the core product flow, the admin dashboard and onboarding get built in priority order, with your feedback after every sprint.
Security review, load testing, Stripe billing in live mode, monitoring and backups, then go live. You receive the full source code, the deployment, and a handover so your team can run it.
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.
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.
Fixed scope, fixed quote. You own the source code on delivery.
| Stage | What it includes | Typical range | Timeline |
|---|---|---|---|
| SaaS MVP | Tenant signup, billing, one core flow, basic admin | $15,000 to $35,000 | About 12 weeks |
| Growth build | Several modules, integrations, reporting, onboarding | $35,000 to $75,000 | 3 to 5 months |
| Scale build | Multiple products, mobile apps, advanced analytics, high load | $75,000 and up | 5 months and up |
Ranges depend on billing complexity, integrations and the number of core flows. Tell us your scope and we will give a fixed quote.
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 at near-zero cost, instead of deploying a fresh copy for each one. We design the tenant boundary up front because retrofitting it later is expensive.
A focused SaaS MVP that covers tenant signup, subscription billing, the core product flow and a basic admin dashboard takes about 12 weeks with a senior team. The timeline holds 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 in writing before starting so the date is real.
A SaaS MVP built to a fixed scope typically runs from $15,000 to $35,000, depending on the number of core flows, the billing complexity and the integrations. A larger product with multiple modules, advanced reporting and a mobile app runs from $50,000 and up. We give a fixed quote against an agreed scope rather than an open-ended hourly bill, and you own the source code on delivery.
We build billing on Stripe so you get subscriptions, free trials, metered usage, proration when a plan changes, and automatic retries when a card fails. The important part is wiring Stripe webhooks to your entitlement logic, so what a customer can access always matches what they pay for. We also build the self-serve flows customers expect: upgrade, downgrade, cancel and invoice history.
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.
Bring us the idea and the one job it must do first. We will map the architecture, agree a fixed scope, and have a working demo in front of you within the first few sprints. You own the code, start to finish.