PRODUCT ENGINEERING / SYSTEM NODESaaS Development

SaaS foundations built correctly the first time.

Auth, billing, multi-tenancy, onboarding, usage limits — the solved problems that still take significant time to implement correctly. We have built these systems before.

Delivery evidence
Ownership, deployment boundary, acceptance criteria, and handover are defined per engagement.
lib/billing.ts
// Idempotent webhook handling
 
export async function
 handleWebhook
(event: Stripe.Event) {
  const existing = await db.webhooks.find({
    stripeId: event.id,
  })
 
  if (existing) return // already processed
 
  switch
 (event.type) {
    case 'invoice.paid':
      await activateSubscription(event.data)
      break
    case 'customer.subscription.deleted':
      await cancelSubscription(event.data)
BUILD / READY
WHAT WE BUILD

SaaS Development, engineered as an operating system.

Scope follows the real workflow, environment, failure modes, and ownership model rather than a fixed vendor package.

01

Multi-tenant Architecture

Data isolation, tenant configuration, and access control designed for B2B requirements from day one — not retrofitted later.

  • Row-level security
  • Tenant configuration
  • Data isolation audit
02

Authentication & SSO

Email, social, and SAML SSO with MFA — built on proven libraries, not custom cryptography. Enterprise SSO documented for your customers.

  • SAML SSO
  • MFA support
  • Enterprise SSO docs
03

Subscription Billing

Stripe integration with plan management, usage-based billing, webhook idempotency, dunning, and revenue recognition data.

  • Stripe Billing
  • Webhook idempotency
  • Usage-based pricing
04

Admin & Ops Tooling

Internal dashboards for tenant management, feature flags, support tooling, and operational visibility — essential before launch.

  • Tenant management
  • Feature flags
  • Support tooling
05

Onboarding Flows

Activation-optimised onboarding — guided setup, empty states, and progressive feature disclosure, with analytics to track activation.

  • Guided setup
  • Empty state design
  • Activation tracking
DELIVERY SEQUENCE

From unknowns to production evidence.

01

Product Scoping

Map core user flows, define the data model, and agree on the initial feature set before any code is written.

Product Vision Product Spec
02

Foundation

Auth (including SAML SSO), multi-tenancy, and core data model — the infrastructure every feature depends on.

Product Spec Foundation
03

Feature Build

Iterative delivery of product features with staging environment reviews at each milestone. No feature shipped without tests.

Foundation Feature Build
04

Billing Integration

Stripe integration with plan management, usage-based billing, webhook idempotency, dunning, and tax handling.

Feature Build Billing Live
05

Admin & Ops

Internal dashboard for tenant management, feature flags, support tooling, and operational visibility — essential before launch.

Billing Live Admin Console
06

Launch & Onboarding

Activation-optimised onboarding, empty states, and the monitoring to see where users drop off.

Admin Console Live Product
TECHNOLOGY SURFACE

Tools selected for the system, not the trend.

Technology follows environment, operating constraints, team ownership, and long-term maintainability.

01Stack

Next.js · TypeScript · Node.js · PostgreSQL

02Auth

Auth.js · Clerk · Auth0 · WorkOS (SAML)

03Billing

Stripe · Stripe Billing · Stripe Tax

04Infra

Vercel · AWS · Railway · Neon

WHERE IT FITS

The same capability changes by domain.

01

Technology

Developer tools, productivity platforms, API-first products, internal tooling SaaS.

02

Finance

Fintech products, expense management, accounting SaaS, compliance tools.

03

Healthcare

Practice management, billing SaaS, patient engagement, clinical workflow tools.

04

Education

LMS platforms, assessment tools, institution management, tutoring SaaS.

TECHNICAL FAQ

Questions worth resolving before delivery.

01How do you handle data isolation between tenants?+

We implement row-level security in PostgreSQL. The choice between separate schema and tenant_id approach is made during architecture scoping based on your scale and isolation requirements.

02Can you implement SAML SSO for enterprise customers?+

Yes. We implement it using WorkOS, Auth0, or custom libraries, and document the configuration process for your enterprise customers.

03Do you handle Stripe webhook reliability?+

Yes. Stripe webhooks require idempotency handling and retry management. We implement this correctly from the start — webhook events are processed exactly once regardless of retries.

04What does the handover include?+

All code, infrastructure documentation, runbooks, environment variable inventory, and operational playbooks. Your team can operate and extend the product from day one without us.

OSYSTIC / PROJECT CHANNELOPEN
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