Software Development
SaaS Development Company
Subscription software built for your first paying customer and your thousandth: multi-tenant architecture, billing, onboarding and the admin tools your support team needs on day one.
- 01SaaS MVP development
- 02Multi-tenant architecture
- 03Subscription billing
- 04Onboarding and self-serve signup
- 05Enterprise readiness
- 06Internal admin and support tools
- 07Scaling and cloud cost reduction
- 08Productizing internal software
At a glance
SaaS development is building subscription software that many customers share, with multi-tenant architecture, billing, onboarding and admin tools. It's for founders launching a first product and companies turning an internal tool into something they can sell. Tag4 Technology Solutions builds an MVP one customer segment will pay for, then helps scale it with SSO, audit logs and cloud cost reviews.
Updated
- Best for
- Founders launching a first product and teams productizing internal software
- Typical timeline
- 3–5 months for an MVP to reach paying customers
- Typical budget
- $80k–$200k for most SaaS MVPs
- Core technologies
- TypeScript, Next.js, Node.js, .NET, PostgreSQL, Stripe, AWS
- Ownership
- You own the code, designs, infrastructure and data from the first commit
- Offices
- New York, Chicago, Dallas, Toronto, Sydney, Dubai
A SaaS product isn't like an internal app, because the software is the business. Every customer shares the same codebase, pays you every month and expects it to be up at 2 a.m. As a SaaS development company, we work with founders launching a first product and with established companies turning an internal tool or service into something they can sell.
The early architecture choices are the ones that hurt to change later. How tenants are isolated (shared database with tenant IDs, a schema per tenant, or a database per tenant) affects hosting cost, security reviews and how hard enterprise deals become. Billing looks simple until you add trials, proration, seat changes, annual plans and usage-based pricing. We make these calls deliberately in the first few weeks and document why, so the next engineer understands them.
The mistake we see most is building too much before anyone pays. Founders spend a year on features, then learn the market wanted something narrower. We push for an MVP that one real customer segment will pay for, launched in roughly 3–5 months and usually costing $80k–$200k depending on integrations. After that, the product grows from usage data and sales conversations rather than the original roadmap.
Scaling is its own phase with its own work: moving noisy tenants onto separate resources, adding SSO and audit logs for enterprise buyers, preparing for SOC 2 audits, and trimming cloud bills that quietly grew with the customer count. We take on that stage too, including for products another team originally built.
What we do
SaaS Development services
SaaS MVP development
A focused first version with sign-up, the core workflow, billing and an admin view, scoped to what early customers will actually pay for.
Multi-tenant architecture
Tenant isolation planned around your security and cost needs, with per-tenant configuration, feature flags and clean data separation.
Subscription billing
Stripe or Chargebee integration covering trials, plan changes, proration, seats, usage metering, invoices and failed-payment recovery.
Onboarding and self-serve signup
Signup, workspace setup, team invites and in-app guidance that get new accounts to their first useful result quickly.
Enterprise readiness
SAML or OIDC single sign-on, SCIM provisioning, granular roles, audit logs and data export, the items larger buyers check in security reviews.
Internal admin and support tools
Back-office screens for impersonation, account changes, refunds and usage lookups, so support doesn't need a developer for every ticket.
Scaling and cloud cost reduction
Profiling, database tuning, caching and cost reviews once growth starts showing up on the monthly bill.
Productizing internal software
Turning a tool your company built for itself into a multi-tenant product other businesses can sign up for.
How we work
What you can expect from us
Tenancy decided on purpose
We walk through the isolation options with you, including what each means for enterprise sales and hosting cost, before the data layer is written.
Billing treated as core code
Billing logic gets the same tests and code review as the product itself. Wrong invoices lose customers faster than most bugs.
Instrumented from launch
Product analytics, error tracking and basic tenant health metrics ship with the MVP, so roadmap decisions come from usage rather than hunches.
Ready for your own team
Many SaaS companies eventually hire in-house engineers. We keep the codebase and docs in a state where that handover takes weeks, not months.
Tools and platforms
- TypeScript
- Next.js
- Node.js
- .NET
- PostgreSQL
- Redis
- Stripe
- Chargebee
- Auth0
- WorkOS
- AWS
- Terraform
- PostHog
Process
From first call to production
Discovery
A few working sessions to pin down goals, users, constraints and what "done" means. You get a written scope and estimate.
Design
Architecture, data model and clickable UI before heavy coding starts, so surprises show up early and cheaply.
Build
Two-week sprints with a demo at the end of each one. You see working software, not status reports.
Launch
Automated tests, staged rollout, monitoring and a rollback plan. Go-live should be boring.
Support
Bug fixes, updates and new features on a monthly plan, or a clean handover to your team.
FAQ
SaaS Development: common questions
How much does it cost to build a SaaS MVP?
Most SaaS MVPs land between $80k and $200k. The spread depends on how many integrations you need at launch, how involved the core workflow is, and whether billing is flat plans or usage-based. We'd rather cut features than cut testing on billing and tenant isolation.
How long until we can launch?
A focused MVP usually reaches paying customers in 3–5 months. Some founders open a private beta with a handful of design partners around month two or three, which is often the best validation you can get before a public launch.
Should each tenant get its own database?
For most B2B SaaS, a shared database with a tenant ID on every row is the right starting point, since it's cheaper and simpler to operate. We add a dedicated-database option for large customers who require one. That's much easier when the code was written with isolation in mind from the start.
Who owns the product and the IP?
You own all of it: source code, designs, infrastructure and data. Everything sits in your repositories and cloud accounts from the first commit. This matters when investors or acquirers run technical due diligence.
Can you take over a SaaS product another team built?
Yes. We start with a two-to-three-week review of the code and infrastructure, then give you a written list of risks ranked by urgency. From there we can stabilize, extend or gradually refactor, depending on what the business needs next.
Do you help with SOC 2 and customer security reviews?
We build the technical controls those audits look for, such as access logging, encryption, backups and change management through pull requests. We aren't an auditor, but we can prepare the evidence your auditor or a compliance tool like Vanta or Drata will ask for.
Related
Often paired with
Web App Development
React, Next.js, Node and .NET web apps, from customer portals to full SaaS front ends.
Learn moreCloud Solutions
Migrations to AWS, Azure and Google Cloud, planned workload by workload with cost built into the design.
Learn moreDevOps Services
CI/CD, Terraform, Kubernetes and observability, set up so your team can run it without us.
Learn moreIndustries we build for
Planning a saas development project?
Tell us what you are trying to build. An engineer reads every message and replies personally. No sales sequences, no pressure.