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Service · 04 · Development

A SaaS product, not a pile of parts.

End-to-end SaaS product development. Subscription billing, user authentication, role-based access, admin panel, usage analytics and email notifications: built as a coherent product, not assembled from parts.

Last reviewed · 1 Oct 20263 primary sources →Kalenux engineering
Map out your product →See how it fits together
operator dashboard
UsersSubscriptionsRefundsUsageSupportSettings
PLANStarter
PLANPro
PLANTeam
SUBSCRIPTION EVENTS
trial → paidupgrade
payment failedretry scheduled
plan changedPro → Team
illustrative · plan names are examples
the product as a business, not just code

One customer's journey touches every system.

That's why we design billing, auth, email, analytics and the admin panel together from day one, not as separate pieces connected later. Illustrative journey:

SYSTEM ↓ · EVENT →SIGNS UPSTARTS A TRIALUSES FEATURESUPGRADESPAYMENT FAILSGETS A REFUND
Auth & roles
Billing
Email
Analytics
Admin panel
We built one ourselves.Kalenux runs its own SaaS product, with subscriptions, payments, an admin dashboard and multilingual content. We know what looks fine in development but breaks in production.
// for B2B products

Multi-tenancy from the start.

For B2B SaaS products where each customer organisation is a separate tenant with isolated data, we design the data model and API authentication layer to support multi-tenancy from the start.

ADDED LATEROne of the most expensive migrations a SaaS product can go through.
BUILT IN FROM DAY ONECosts very little by comparison.
Your SaaS · one APItenant-scoped queries
Org Aisolated dataown settings
Org Bisolated dataown settings
Org Cisolated dataown settings
illustrative
what you get

Every menu item is a deliverable.

Each item in the dashboard's sidebar is a working system we build and hand over.

OverviewBillingUsers & rolesEmailsAnalyticsTenantsAPI keys
Operator overview
MRR$18,240+6.2%
ACTIVE TRIALS312+41
CHURN2.1%−0.4
FAILED PAYMENTS9retrying
Illustrative dashboard.
  • BillingPlans, trials, upgrades, failed payments, webhooks, invoices
  • Users & rolesSign-up, verification, 2FA, role-based access
  • EmailsTransactional templates, delivery logs, unsubscribes
  • AnalyticsFeature usage, retention, conversion funnels
  • TenantsIsolated data per organisation for B2B
  • API keysA documented API for customer integrations
how we work

Scope the business before the schema.

Four business decisions come before any table is designed. They decide whether the product is still maintainable at scale.

PHASE 1 · PRODUCT SCOPING
Subscription tiersFree · Pro · Team
User rolesOwner · Admin · Member
Operator workflowsRefunds, plan changes, support
Key metricsMRR, trial conversion, churn
Example answers, for illustration.
  1. PHASE 2 · BUILD
  2. 02Data modelSchema, plan enforcement, multi-tenancy if needed
  3. 03Auth + billingUser system, payments, webhooks
  4. 04Core featuresWhat customers actually pay for
  5. 05Admin panelOperator interface and analytics
  6. 06Test + launchEnd-to-end flows, monitoring, a runbook
in depth · 3 primary sources

The published guidance behind multi-tenant SaaS.

The standards and published guidance behind how we deliver this service, with every claim linked to its source.

01Tenant isolation

Industry guidance for SaaS treats tenant isolation, making sure one customer can never see another’s data, as a foundational requirement, alongside onboarding, identity and metering [1].

KEY FACTIsolation is enforced in the application and data layers, not only in the UI [1].

02Access control

Broken access control is the top risk in the OWASP Top 10 [2]. Role and permission checks are verified against the OWASP ASVS [3].

References

  1. [1]SaaS Lens: AWS Well-Architected Framework · Amazon Web Servicesdocs.aws.amazon.com/wellarchitected/latest/saas-lens/saas-lens.html
  2. [2]OWASP Top 10 · OWASP Foundationowasp.org/www-project-top-ten/
  3. [3]Application Security Verification Standard (ASVS) · OWASP Foundationowasp.org/www-project-application-security-verification-standard/
CITE THIS PAGEKalenux. (2026). SaaS product development service. Kalenux SEO Guide. Last reviewed 1 Oct 2026. kalenux.com.tr/service/saas-products
// start a SaaS project

Ready to build your SaaS product?

Tell us the product idea and the target customer. We’ll map out the data model, subscription architecture and feature set.

Get in touch →@emirbaycan@kalenux.com.tr
WHAT HAPPENS NEXT
1
Within one business dayA real reply from an engineer, not an automated queue.
2
Product mapData model, subscription architecture and feature set.
3
TimelineA step-by-step plan through to production launch.
// related services

Often paired with SaaS development

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