Web App Development Sydney
Customer-facing web applications and SaaS products — the kind with user accounts, live data, billing and a roadmap, not just pages. We build web apps in Sydney, and we run our own, so we build for the years after launch.
What is a web app (and how it differs from a website)
A website presents information; a web app does work. If people log in, data changes, and the thing keeps state between visits — a booking system, a portal, a dashboard, a marketplace, a SaaS product — you need a web application, not a brochure site. BizziGroup builds web apps that run in any browser, install like an app where it helps, and scale from your first ten users to your ten-thousandth.
If you actually need a marketing site, our web development service is the right home; if you need an internal tool for your own staff, that is custom software. This page is for the product your customers log into.
SaaS Products
Multi-tenant subscription products with accounts, plans, billing and a path to grow feature by feature.
Customer Portals
Secure logins where your customers self-serve — bookings, documents, orders, status and history.
Dashboards & Analytics
Live, interactive views of the data that matters, pulled together from wherever it lives.
Progressive Web Apps
Installable, offline-capable apps that behave like native without the app-store tax.
We build web apps — and run them
Most agencies build a web app, hand it over, and never think about month six. We ship and operate our own browser-based SaaS products, so we design for the parts that only show up once real users arrive: authentication that does not fall over, billing that reconciles, data you can export, and a codebase the next developer can actually read. You can see the depth a bespoke platform can reach in the Fire & Building Compliance Suite case study.
Our web app stack
Proven, well-supported technologies chosen for maintainability, not novelty:
- Frontend: React, Next.js, Astro
- Backend: Node.js, Python, serverless
- Data & auth: Supabase, PostgreSQL, Auth0
- Billing: Stripe subscriptions & usage
- Integrations: REST & GraphQL APIs, webhooks
- Hosting: Netlify, Vercel, AWS
What's included with every web app
- A written specification and a fixed quote before any code is written
- Secure user accounts and role-based access
- Responsive interfaces that work on desktop, tablet and phone
- Subscription or usage billing where the product needs it
- Data ownership and a clean export path
- Analytics, error monitoring and a post-launch support period
Start small, ship early
Web apps fail when they try to launch everything at once. We build the smallest version that delivers real value — a first release you can put in front of users in weeks — then grow it against what they actually do. That keeps risk low, feedback early, and your budget pointed at features people use. Our guide to software costs in Australia breaks down what each stage typically runs.
- Discovery - we map the product to the job users are hiring it to do.
- Fixed quote - a written scope and a fixed price for a defined first version.
- Build the core - the smallest app that is genuinely useful, shipped early.
- Launch & learn - real users, real data, real feedback.
- Grow - the next features, prioritised by what users reach for.
Have a web app or SaaS idea?
Tell us what it needs to do. We'll scope the build and give you a fixed price for a first version you can put in front of users.
Get a free quoteWeb App FAQs
Common questions about building a web application or SaaS product with a Sydney team.
A website mainly presents information; a web application does work for logged-in users and keeps state between visits - think portals, dashboards, booking systems and SaaS products. If people sign in and data changes, you need a web app. If you just need a marketing presence, a website is the right (and cheaper) tool.
It scales with scope. A focused first version can start from a few thousand dollars; a full SaaS product with billing and integrations is a larger investment. We quote a fixed price against a written scope for a defined first release. Our Australian software cost guide walks through the tiers.
Yes. We build subscription and usage-based billing with Stripe - plans, trials, upgrades, invoices and the webhook plumbing that keeps your database and Stripe in agreement. We run this in our own products, so it is well-trodden ground.
Yes. On final payment you own the source code, the database and the hosting and analytics accounts, with a clean handover another developer could continue. No lock-in.
No - we recommend against it. We build the smallest genuinely useful version first, get it in front of users, then grow it against real usage. It keeps risk and cost down and points your budget at features people actually use.