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5+ year B2B SaaS engineering partnership live in production

Custom B2B SaaS Built With the Architecture to Reach Customer 1,000: Not Just Customer 10

Our engineers have been DealSignal’s engineering partner for five-plus years, since before Rorix was founded, building a B2B data intelligence platform from the ground up. Multi-tenant architecture, CRM integrations, AI-assisted verification, real-time signals, and two full framework migrations, without a single rewrite. You own every line of code.

5+
B2B SaaS Platforms Built
12 Wks
To First Paying Customer
40+
Integrations Delivered
100%
Source Code Ownership

✓ Multi-tenant from day one  ·  ✓ API-first architecture  ·  ✓ You own the code, always  ·  Comparing SaaS agencies? See why teams choose Rorix →

The Problem

Where Most B2B SaaS Builds Fail

The decisions made in the first sprint (tenancy model, auth, billing, API design) determine whether you scale or rewrite. Most agencies don’t tell you this until month six.

Wrong Architecture on Day One

Single-tenant databases that can't scale to 50 customers. No row-level isolation. Auth bolted on after the fact. Rebuilding core architecture mid-flight costs more than building it right from the start.

6 to 18 months of rearchitecting

Too Slow to First Revenue

Most SaaS builds take 12 to 18 months to reach a paying customer. By then the market has shifted, the investor patience has worn thin, and the team has burned through the budget.

Runway consumed before product-market fit

Subscription Billing Complexity

Stripe is not billing. Seat-based pricing, usage metering, trial logic, plan upgrades, proration, and invoice generation all need to be built, and they interact with each other in surprising ways.

$30K+ if scoped and built post-launch

CRM & Integration Debt

Every B2B SaaS prospect asks about Salesforce and HubSpot sync on the first demo. Building it as an afterthought means months of rework and a fragile connector that breaks on every CRM API update.

Lost deals at the integration question

No API-First Design

Customers want webhooks, API keys, and data export on day one. Building a public API after a UI-first codebase means exposing internals that were never designed to be public contracts.

3 to 6 months of API redesign post-launch

Agency Handoffs That Leave You Stranded

An agency ships v1 then leaves. The next team rewrites the parts they don't understand. Context evaporates. DealSignal has had the same engineers for five-plus years for a reason.

Rewrite cost every 18 to 24 months
What We Build

Every Layer of a Production B2B SaaS Platform

From the database schema to the Stripe webhook: built right from the start, not retrofitted later.

Multi-Tenant Architecture

  • Schema-per-tenant or row-level isolation strategies
  • Tenant provisioning and onboarding flows
  • Data isolation, RBAC, and SSO (SAML/OAuth)
  • Tenant-scoped analytics and usage reporting

Subscription Billing Engine

  • Stripe / Paddle integration with proration logic
  • Seat-based, usage-based, and flat-rate pricing
  • Free trial, dunning, and churn recovery flows
  • Invoice generation and payment history

Integrations & API Platform

  • Salesforce and HubSpot two-way sync
  • Webhook delivery with retry and log
  • Public REST / GraphQL API with versioning
  • OAuth app for third-party marketplace listing

Dashboards & Admin Layer

  • Customer-facing analytics and reporting dashboards
  • Internal super-admin panel for tenant management
  • Feature flag and plan-gating infrastructure
  • Audit logs and compliance exports (SOC 2 ready)
Proof

B2B SaaS Platforms We’ve Built and Scaled

Long-term engagements, not one-and-done deliveries.

DealSignal
B2B SaaS · Sales Intelligence
5+ Years, Ongoing

Core engineering partner for a B2B data intelligence platform. Built the full product: on-demand verification pipeline, advanced filter builder, Salesforce and HubSpot sync with full activity logging, real-time Signals feature, Chrome extension, and a complete migration from Angular 14 to Angular 21.

  • 5+ year ongoing partnership
  • Salesforce + HubSpot CRM integrations live
  • AI + human verification pipeline for on-demand data freshness
  • Design system created and maintained across the product
View full case study
White-Label B2B Platform
B2B SaaS · Home Services
6 Months, Shipped

Built a white-label SaaS platform for a home services technology company. 40+ vendor integrations (HubSpot, Twilio, RingCentral, Google APIs), iOS and Android from a single React Native codebase, real-time data flowing from all major home service tools into one unified dashboard.

  • 40+ third-party integrations connected
  • iOS and Android from one React Native codebase
  • 6 months, multi-developer, full-stack delivery
  • Real-time data unification across all platforms
View full case study
How We Work

From Architecture Decision to First Paying Customer

The same playbook we used for DealSignal, scaled to your stage and velocity.

1

Architecture Design Before Any Code

We design your multi-tenancy model, data isolation strategy, API contract, and integration points before the first sprint. Getting this right upfront is the difference between a platform that scales and one that needs a rewrite at customer 50.

2

MVP in 10 to 12 Weeks

Core auth, tenant provisioning, one pricing plan, the primary use case, and the integrations your target customer will ask about in the first demo. Working software, not a prototype. Stripe wired. Not a skeleton.

3

Iteration Toward Product-Market Fit

Two-week sprints. You set the priorities. We ship. The same engineers who built your core stay on to extend it: they know why every decision was made and what the edge cases are.

4

Long-Term Partnership

DealSignal's product has evolved dramatically over five years. The Rorix engineers who built the original filter builder are still maintaining and extending the platform today. That's the model we offer.

Tech Stack

Modern Stack. No Vendor Lock-in.

We pick what fits your scale and your team, not what’s fashionable this quarter.

Frontend
ReactNext.jsAngularVue
Backend
Node.js / NestJSRuby on Rails.NET CorePython / FastAPI
Database
PostgreSQLClickHouse (analytics)RedisMongoDB
Infrastructure
AWSGCPDockerVercel / Render
Billing
StripePaddleChargebeeCustom metering
Integrations
SalesforceHubSpotTwilioSlack / Teams API

B2B SaaS Development: Frequently Asked Questions

Straight answers on timeline, cost, architecture, billing, integrations, and code ownership.

Start With a Free Architecture Review

Bring your concept, your wireframes, or your existing codebase. We’ll walk you through the architecture decisions that matter most at your stage (multi-tenancy, billing, integrations) and give you a fixed-price quote with a real timeline.

  • Review your multi-tenancy model and data isolation strategy
  • Audit your billing architecture and integration requirements
  • Define the MVP scope that reaches your first paying customer fastest
  • Provide a fixed-price quote with milestone-based delivery

Free 30-minute call. Architecture recommendations and MVP scope included. No commitment required.