Custom SaaS Development
B2B SaaS,
built to ship and scale.
Custom SaaS development for Australian businesses building serious B2B platforms. Multi-tenant architecture, billing, auth, observability — done with the engineering rigour that turns a clever idea into a sustainable product business.
Quick answer: a serious SaaS build is a real product engineering project — not a website with login. The work splits across multi-tenant architecture, billing and subscription logic, auth and access control, observability, admin tooling, and the operational layer that lets a small team run the product without it falling over. We do all of it, in plain English, with code your in-house team can pick up after we’re done.
What “SaaS development” actually covers
A working production SaaS has more moving parts than most clients expect at the start of an engagement:
- Multi-tenant architecture. The pattern that lets one application serve many customer organisations safely, with their data properly isolated.
- Authentication and authorisation. Login, password reset, multi-factor, role-based permissions, team management — the table-stakes layer customers expect.
- Billing and subscriptions. Stripe Billing integration, plan management, usage-based metering where relevant, invoicing, and the dozens of edge cases (failed payments, plan changes mid-cycle, refunds) that production billing has to handle.
- Application-level audit and access logging. Required for B2B sales, particularly to regulated customers.
- Admin tooling. The internal interface your team uses to support customers, debug issues, and manage tenants.
- Observability. Logs, metrics, error tracking, uptime monitoring — the visibility that lets you operate the product confidently.
- Public marketing site & documentation. Often built separately for performance, but part of the product surface.
- Integration capability. APIs, webhooks, and third-party connectors that let your customers plug your SaaS into their stack.
Skipping any one of these is how SaaS projects end up needing a rebuild within eighteen months. We’ve covered the related build-vs-buy decision framework and SaaS-vs-custom TCO in detail elsewhere on the site.
When SaaS development is the right path
The honest version: SaaS development is the most expensive product path a business can take, and most ideas should be validated with no-code or off-the-shelf tools before committing to a custom build. We see SaaS work succeed when one or more of these is true:
- You’ve validated demand with manual or no-code prototypes and the next constraint is genuine product capability
- The market niche is specific enough that no existing SaaS fits, and the addressable market is meaningful
- You’re building something where domain expertise is the moat, not the technology
- You have a credible go-to-market plan, not just a product idea
- You can sustain operating costs while the product matures — SaaS doesn’t pay back fast
If those don’t describe you yet, the right call is usually integrating existing tools or building an internal tool rather than committing to a multi-year SaaS programme.
How we work on SaaS builds
Our SaaS engagements are deliberately phased. Rather than estimating an eighteen-month build up front, we structure each phase around something shippable:
- Phase 0 — Discovery (2–3 weeks). Documented brief, technical architecture, phased plan, risks register, and an honest pricing range for phase one. Often a separate fixed-price engagement.
- Phase 1 — MVP build (8–14 weeks). Deliberately narrow scope — one core workflow, multi-tenant, with billing and auth, ready for first customers.
- Phase 2 onwards — expansion (re-decided). Based on what phase one taught you about real customer behaviour. Often broader feature surface, deeper integrations, more sophisticated billing.
The phasing protects against the most common SaaS failure mode: spending months building features that turn out not to matter once real customers use the product.
Common questions
What is SaaS development?
Building a software-as-a-service product — a multi-tenant web application sold to multiple customers via subscription. Different from internal tools (one tenant, your own staff) and from off-the-shelf SaaS purchase. SaaS development covers architecture, auth, billing, observability, and the operational layer that turns code into a sustainable product business.
How much does it cost to build a SaaS?
A focused MVP for a B2B SaaS targeting a clear niche typically runs $80,000–$200,000 to ship a credible v1. A serious production-grade product with billing, multi-tenancy, observability, admin tooling, and integration capability is usually $150,000–$500,000+ depending on scope. We scope phase one deliberately narrow so cost is predictable and learning is fast.
How long does a SaaS MVP take to build?
For a tightly-scoped MVP targeting one core workflow: 12–20 weeks. The fastest builds skip discovery, observability, or tests and end up rebuilt within the year. The shape of work that consistently ships well: 2–3 weeks of discovery, 8–12 weeks of focused build, 2–3 weeks of polish and launch prep.
What tech stack do you use for SaaS?
Default: TypeScript end-to-end (Node + Astro/Next.js frontend), Postgres for primary data, a managed background-job queue, Stripe for billing, a managed auth provider (Clerk, WorkOS, or Auth0 depending on B2B requirements), and observability via Sentry plus structured logs. We adjust based on the project — we don’t pick frameworks for fashion.
Can you take over an existing SaaS codebase?
Yes. We do takeover work regularly — usually for products that started with a different team or got built rapidly to validate market fit and now need to scale operationally. The first phase is always an audit (what’s here, what’s technical debt, what would we do differently) before any build commitments.
Do you handle SaaS billing and subscriptions?
Yes — Stripe is our default for SaaS billing, with custom logic for usage-based pricing, seat counting, plan changes, and invoicing where the use case requires it. The integration layer between Stripe events and your application data is one of the most-bug-prone areas of any SaaS, so we treat it with the engineering rigour it deserves.
How do you handle multi-tenancy?
For most B2B SaaS use cases: shared database with row-level tenancy isolation enforced at the application layer, with strong audit logging and explicit checks at every data-access boundary. For high-security or compliance-driven cases (health, finance, government), we use database-per-tenant or schema-per-tenant approaches. The right pattern depends on the customer profile.
Should I build a SaaS or use an existing platform?
Build a SaaS only when there’s a clear market gap and you’ve validated the demand — building a SaaS is one of the most expensive product paths a business can take, and most early-stage SaaS ideas are better served by validating with no-code first. We turn down SaaS builds where the validation isn’t there yet.
Let’s build something
The right system,
built once, properly.
If your business is ready to scale beyond what off-the-shelf tools can support — we should talk.