Crescentek

SaaS Development

From idea to real SaaS business.

Multi-tenant SaaS platforms built for Irish founders and operators. Auth, billing, admin dashboards, and the security foundations most MVPs skip — done properly from day one, so you're not rebuilding in year two.

Based in Ireland
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Reply within 1 working day
app.yoursaas.ie/admin
Admin dashboard
Business overview
Live
MRR
€48.2k
+12.4%
Active tenants
342
+28
Churn (30d)
1.8%
-0.4pp
Trial → paid
24%
+3pp
MRR · last 12 mo
€48.2k
Tenants
342 total
Acme Ltd
12 seats
Pro
Northside Co
5 seats
Team
Galway Group
48 seats
Enterprise
Beta Industries
3 seats
Trial
Where SaaS MVPs die

Four foundations no MVP can fake.

The SaaS products we rebuild are almost always ones that skipped these. Getting them right from day one is the single biggest predictor of whether the business survives year two.

Multi-tenancy done wrong

Tenant data leaking into other accounts. The kind of bug that ends a SaaS business in one bad week.

Subscription billing nightmares

Prorating, upgrades, dunning, failed cards, tax — billing logic alone can sink a launch.

No security foundation

SOC 2, GDPR, role-based access, audit trails — retrofitted later means rebuilding the app.

Can't scale with customers

The MVP that worked for 10 users falls apart at 500. Architecture decisions from day one matter.

Three essential layers

Auth. Billing. Admin. Built in from day one.

These aren't 'phase 2' features. They're the foundation every SaaS needs. We build them first, not last — even if that means the MVP takes a month longer.

Auth & tenancy

Users, teams, permissions

Multi-tenant data isolation
Role-based access control
SSO / SAML (Google, MS, Okta)
Team invites & member management
Email verification & password reset
Billing & subscriptions

Plans, payments, revenue

Stripe / Paddle integration
Recurring subscriptions
Metered & usage-based billing
Free trials & upgrades
Invoices, VAT, and receipts
Admin & analytics

Running the business

Admin dashboard (not just app)
User activity & feature usage
MRR, churn, cohort tracking
Customer success signals
Support tool integration
Our MVP approach

Foundations first. Features second. Customers always.

The agencies that rush to features without auth, billing, or multi-tenancy — we clean up after them. We'd rather not create more of that mess.

1

Define the MVP

Weeks 1–2

Scope down ruthlessly. Identify the smallest product that validates the business — not the fullest product that wins design awards.

2

Build the foundation

Weeks 2–6

Auth, multi-tenancy, billing skeleton, admin dashboard. These exist before any customer-facing feature — because retrofitting them is miserable.

3

Ship core features

Weeks 6–16

The actual thing your customers are paying for. Built in sprints, working software every 2 weeks, tested with real users as we go.

4

Launch & iterate

Weeks 16+

Public launch, onboarding polish, billing edge cases. Then ongoing — because SaaS only starts earning after real customers find the rough edges.

Is it a fit?

SaaS is for operators who've validated the problem — not brainstormers.

If you have early customers (even paying beta users), we can accelerate. If it's still just an idea, we'll tell you to validate first.

Right fit
We should talk if…
You have a validated SaaS idea — even better, early customers
You want to own the platform, not rent it from a vendor
You're prepared for a 4-8 month MVP, not a 4-week sprint
You have budget for post-launch iteration — the real work starts then
You can commit a product owner / domain expert weekly
Not a fit
We'll point you elsewhere if…
Your SaaS idea is still entirely hypothetical — validate first, please
You want a 'Slack killer' with no differentiation — different conversation
Your budget is under €25k — most SaaS MVPs need more runway
You want us to find your customers too — that's your job, not ours
Tech we build with

Modern SaaS-ready stack — multi-tenant, secure, built to scale.

Next.js / React
Node.js / tRPC
PostgreSQL / Supabase
Stripe / Paddle
Clerk / Auth0
Vercel / AWS
Redis / caching
Cloudflare Workers
What we typically build

Common SaaS scenarios.

From vertical SaaS MVPs to turning internal tools into products — Irish builders and founders.

Vertical SaaS platforms
Marketplace platforms
Internal tools → SaaS
Professional services SaaS
Industry-specific tools
Platform MVPs & launches
SaaS migrations & rebuilds
White-label platforms
Common questions

SaaS questions, honestly answered.

The questions Irish SMBs ask us most often.

4-8 months for a proper SaaS MVP with auth, billing, core features, and admin tooling. Anyone promising 8-12 weeks is either skipping critical foundations or shipping something you'll rebuild within a year. We'd rather be honest up-front: good SaaS takes time, and the months saved by shortcuts usually cost years of tech debt.
Depends on scale and security requirements. For most Irish B2B SaaS, shared-database-with-tenant-isolation (row-level security in PostgreSQL) hits the sweet spot of simplicity and security. For high-compliance cases (healthcare, finance), we use separate databases per tenant. We discuss tradeoffs with you — no one-size-fits-all.
Both are solid. Stripe is the default for most cases — lower cost, more flexibility, deeper integrations. Paddle handles VAT globally (they're the merchant of record), which simplifies selling across borders but costs more. For Ireland-focused B2B, Stripe + proper VAT handling is almost always the answer.
Yes, and we'll push back. Most founder feature lists we see could ship as a third of what's listed. Scoping down is where good SaaS gets built — not just feature-dumping everything from the brainstorm. We'll help you identify the smallest useful product, then grow from there.
That's when the real work starts. Post-launch covers: customer onboarding tweaks, bug fixes, feature requests, performance optimisation as users grow, billing edge cases, and fixing things you couldn't have predicted in design. We usually move to a monthly retainer, or you can take the code in-house.
You do. The code lives in your repo, you get full documentation, and any third-party tooling (Stripe account, hosting, etc.) is in your name. No vendor lock-in — another agency or in-house team can pick it up if you ever want to move.

Got a SaaS idea ready to build?

Free 45-minute strategy call. Walk us through your idea and we'll tell you honestly — what to cut, what to prioritise, and what a realistic MVP actually looks like.

Reply within 1 working day GDPR compliant Based in Ireland