SaaS products built for recurring revenue.

Building a SaaS is more than an app — it's multi-tenancy, billing, onboarding, and scale. We build production-ready SaaS platforms designed to acquire, retain, and grow paying customers.

  • Multi-tenant
  • Billing built-in
  • Scale-ready
Start a project See our work
8–12 wk
to MVP launch
Day 1
revenue-ready
∞
tenants supported
Available for new projects Replies in ~24h NDA on request
Product.tsx Live
1// shipped to production — built to last
2import { build, ship } from "@exarth/core";
3 
4export function Product() {
5 const app = build({
6 quality: "production",
7 tested: true,
8 });
9 return app.deploy();
10}

$ npm run build

compiled successfully · 0 errors

128 tests passed in 4.2s

deploy shipped
main 0 problemsHTML5CSS3JavaScript

Trusted by startups and enterprises shipping real products.

100+Projects shipped
8+ yrsBuilding software
50+Happy clients
4.9★Avg rating

Overview

From idea to paying customers

We've built the hard parts of SaaS many times — tenant isolation, subscription billing, usage limits, onboarding, and role management — so you can focus on the product.

The approach

Launch faster on a foundation built to scale.

What that means for you

01

Secure multi-tenant architecture

02

Subscriptions, plans & metered billing

03

Self-serve onboarding and trials

04

Admin, roles, and usage analytics

SaaS Development

Software Development

8–12 wk

to MVP launch

Day 1

revenue-ready

∞

tenants supported

Built with

  • HTML5
  • CSS3
  • JavaScript
  • jQuery
  • AJAX
  • Bootstrap
Discuss your project

What we build

Everything this service covers

A complete, production-ready capability set — not a checklist of buzzwords. Every item ships as standard with your build.

6core capabilities
included as standard

Included with every build

  • Built to production quality
  • Documented & handed over to your team
  • Automated tests & CI/CD pipeline
  • Security & best practices baked in
  • No hidden add-on fees
  • 30 days post-launch support
Scope your build
01

Multi-tenancy

Isolated, secure tenants with shared, efficient infrastructure.

Included as standard
02

Subscriptions & billing

Plans, trials, upgrades, and metered usage via Stripe.

Included as standard
03

Onboarding flows

Self-serve signup and onboarding that convert trials to paid.

Included as standard
04

Teams & roles

Workspaces, invitations, and granular role-based access.

Included as standard
05

Usage analytics

Track activation, engagement, and churn signals.

Included as standard
06

Built to scale

Architecture that grows from your first user to thousands.

Included as standard

Why this approach

Custom-built vs the alternative

The same job, two very different outcomes. Here's an honest, side-by-side look.

Recommended

Custom-built with Exarth

A production SaaS foundation you own and can scale.

Best long-term value

VS
Alternative

Boilerplate / no-code builders

Templates and builders you outgrow the moment you grow.

Hidden long-term cost

Multi-tenancy
Secure, isolated by design
Bolted on or not at all
Billing
Plans, trials & metered usage
Basic or locked behind upgrades
Customisation
Anything your product needs
Capped by the builder's limits
Scale
Stateless, cloud-native
Hits a ceiling under load
Ownership
Your codebase & data
Locked to the platform

Builders get you a demo. A real foundation gets you a business you can scale, raise on, and one day sell.

Build it the right way

How we work

From idea to live

A clear, four-phase path with real demos and deliverables at every step — you always know what we're doing and what you'll get.

  1. 01
    Week 1–201/04

    Shape the MVP

    We define the core loop and the smallest version worth shipping.

    What we do

    • Market & user research
    • Core loop definition
    • Feature prioritisation

    What you get

    • Core loop defined
    • Feature scope
    • MVP roadmap
  2. 02
    Week 2–302/04

    Architect for scale

    Multi-tenancy, billing, and auth designed in from the start.

    What we do

    • Multi-tenant design
    • Billing & auth design
    • Infra planning

    What you get

    • Tenancy & auth design
    • Billing model
    • Infra plan
  3. 03
    Week 3–1003/04

    Build & iterate

    Ship the MVP fast, then iterate on real user feedback.

    What we do

    • MVP development
    • Usability testing
    • Feedback-driven iteration

    What you get

    • Shippable MVP
    • User feedback loops
    • Sprint demos
  4. 04
    Week 10+04/04

    Launch & grow

    Go live with analytics and the infrastructure to scale.

    What we do

    • Production launch
    • Analytics instrumentation
    • Performance scaling

    What you get

    • Production launch
    • Analytics live
    • Scaling support

Technology

Built on a modern, proven stack

Battle-tested tools chosen to fit the problem, not the hype cycle — fast, secure, and a pleasure to maintain.

Chosen for

Speed

Optimised for fast, responsive software.

Security

Hardened with best-practice defaults.

Scalability

Grows with your users and team.

Maintainability

Clean, documented, easy to extend.

01

Frontend

8 tools

Your product's interface.

  • HTML5
  • CSS3
  • JavaScript
  • jQuery
  • AJAX
  • Bootstrap
  • React / Next.js
  • Tailwind CSS

A polished, fast product UI.

02

Backend

6 tools

Auth, tenancy, and logic.

  • Python · Django
  • FastAPI
  • Flask
  • Node.js / Express
  • Auth & RBAC
  • Webhooks

A secure multi-tenant core.

03

Billing

3 tools

Subscriptions and payments.

  • Stripe
  • Metered usage
  • Invoicing

Revenue-ready from day one.

04

Infra

4 tools

Scalable cloud foundation.

  • AWS
  • Docker
  • Redis
  • CI/CD

Scales from one user to many.

Sectors we engineer for

Industries built for real friction

Each vertical has different compliance, UX, and scale demands — pick a sector to preview exactly what we build for it.

Healthcare

HIPAA-aware platforms that put clinicians and patients first.

Discuss a Healthcare project01 / 10

What we build

  • Patient & provider portals
  • Telemedicine & scheduling
  • HL7/FHIR data exchange

Tech & focus

  • HL7/FHIR
  • Secure APIs
  • Patient UX

Featured work

From challenge to measurable impact

An operations team was juggling spreadsheets and disconnected tools. We unified everything into one custom platform — and gave them hours back every week.

Replacing four disconnected tools with one custom platform

Operations / Logistics

The challenge

Critical work lived across spreadsheets, email, and three separate tools that never talked to each other, creating constant manual re-entry and costly errors.

What we built

  • Mapped every workflow before building
  • Unified four tools into one platform
  • Automated the manual, repetitive steps
  • Migrated all legacy data cleanly

Built with

  • Next.js
  • Node.js
  • PostgreSQL
  • AWS

The results

40%less manual work
4 → 1tools unified
8 wksto first release
We finally have one source of truth — it changed how the whole team operates.
— Head of Operations, logistics firm

What you get

Outcomes that move the needle

We don't measure success in features shipped — we measure it in the results your business feels. Here's what changes once it's live.

8–12 wkto MVP launch
Day 1revenue-ready
∞tenants supported
01

Faster to market

Skip rebuilding billing and tenancy — launch on a proven base.

  • Proven foundation
  • Skip rebuilding basics
  • Launch in weeks
02

Revenue-ready

Subscriptions, trials, and upgrades work from day one.

  • Subscriptions day one
  • Trials & upgrades
  • Automated billing
03

Scales with growth

Infrastructure that won't buckle as customers pile in.

  • Handles user spikes
  • Cloud-native infra
  • No re-platforming later

Explore more

Other software services

Most projects touch more than one of these — swipe through the rest of what our software team builds.

View all services