Custom software development in Brisbane

SI30 is a Brisbane software company. We build business systems, web apps and phone apps for established businesses with around 50 people. Then we connect them to Xero and the software you already use, so a quote, a job and an invoice are typed in once.

Get your free job map → or call 0410 383 332, weekdays 8am to 5pm.

Start with the free job map. Our first meeting is free: one video call, about an hour. We map how a job moves through your business and show you where it gets stuck. You keep the map, a one-page PDF, whether or not you go ahead.

If you go ahead, the first stage is a fixed price, from $3,000 ex GST, agreed in writing before work starts. We plan for it to go live within four to six weeks of the go-ahead, with a demo every week while it’s built.

Not ready to talk? Take the 1-minute job check.

Built and in use: Homified, our household app, is live and free on the App Store. A morning brief we built reads our mailboxes, the calendar and Xero, and sends us one email at 7:30 every morning.

What we build

Business systems and CRMs

Your customer and job records in one place: enquiries, quotes, jobs, invoices and the dashboards that show how the business is going. Built around how your team already works. More on business systems.

Web apps that replace spreadsheets and old databases

When a spreadsheet runs the place, or a Microsoft Access database only one person understands, we turn it into a system that works in a browser on any computer, phone or tablet. We bring across the records we agree on, check counts and totals, and explain anything missing or damaged before you switch. Fixing or replacing Microsoft Access.

Microsoft no longer sends security updates to Access 2021 or any older one-off version. Access 2021 was the last to stop, on 13 October 2026. Those versions still open and run. Access 2024 still gets security updates, and so does Access in Microsoft 365 with an active subscription and updates turned on. Check your version.

Apps for iPhone, iPad and Android

Apps for your staff in the field, or for your customers. They carry your business’s name and are published through your own Apple and Google developer accounts (Apple charges about US$99 a year, Google a one-off US$25). We help you set those up and take each app through Apple’s and Google’s review.

Connecting the software you already use

A quote becomes the job, the job becomes the invoice, and nobody types it twice. If you use Xero, invoices can go straight into it.

Websites

Sites that work on any phone, bring in enquiries and pass them straight into your system. Just need a website? See our flat-price websites.

Devices and the software behind them

Building a device? Circuit boards, firmware and the app and cloud a device reports to have their own pages: Hardware and Firmware.

What you get, week by week

Here’s the plan, from the day you send a few lines. Most of the work is ours. Yours is some time in week one, and a trial on real jobs in weeks five and six.

1. Day 1: a straight answer. Tell us how your business runs. Within one business day you’ll hear whether we can help, and what we’d look at first.
2. Week 1: the free job map. Our first meeting is free: one video call, about an hour. We map how a job moves through your business and show you where it gets stuck, and you keep the map, a one-page PDF, whether or not you go ahead. We also check what your current software lets us connect to.
3. Weeks 1 to 2: a fixed price, in writing. Stage one fixes the worst bottleneck first, at a fixed price from $3,000 ex GST, agreed before work starts. The quote says what’s in, what’s out, how we’ll test it, the dates, and the monthly cost of hosting and support.
4. Weeks 2 to 5: built where you can see it. A demo every week on a private link, and your feedback goes into the next week’s work. No disappearing for months.
5. Weeks 5 to 6: tried on real work, then switched on. Your office and one team use it on real jobs alongside the old way, with a training session, a one-page guide and short how-to videos. Then it goes live, and any automations are switched on one at a time, with your sign-off.

Your team uses it before you decide on anything more. Each later stage is quoted before it begins. Get your free job map, or call 0410 383 332.

What we’ve built, and where it’s up to

Most of what we build started as a problem of our own. Each one is on Our work, with its screens.

• Homified, a household app. Live and free on the App Store.
• A morning brief that reads our mailboxes, the calendar and Xero, and sends one email at 7:30. It runs on our own mail every morning.
• A private document room for confidential files. In use since September 2026.
• SI30 Solo, an iPhone app for NDIS support workers and therapists who run their own practice. The free pilot is open now, and it’s coming to the App Store.
• INV-101, an invoicing app for sole traders. In testing.
• SI30 Desk, a CRM that prepares the next step. Built and tested, not live yet.
• SI30 Care, an operations system for NDIS providers. A demo with fictional data, private preview on request.
• THE ORB, a desk display. A$199, ships within 4 weeks of your order.

Where we work

We’re based in Brisbane and work across South East Queensland: Brisbane, Gold Coast, Sunshine Coast, Ipswich, Logan, Moreton Bay and Redlands. Businesses elsewhere in Australia are welcome too.

Who it’s for

Established businesses with around 50 people, still running on tools that were picked for a business half the size. Sound familiar?

• A spreadsheet runs the place, and one person really understands it.
• Customers in one program, jobs in another, invoices in a third, and someone retyping between them.
• Staff ringing the office to ask where they’re meant to be today.
• Month end that ties up the office for a week.

When we’re not the right fit

• A ready-made system already fits how you work. If it does, we’ll tell you.
• Your Access database still does the job for a handful of people in one office. Moving to a supported version of Access is usually the simpler step.

Questions owners ask

What does the first meeting cost?

Nothing. It’s the free job map: one video call, about an hour. We map how a job moves through your business and show you where it gets stuck. You keep the map, a one-page PDF, whether or not you go ahead.

How much does custom software cost?

It depends on what it has to do, so we price it in stages. The first stage is a fixed price, from $3,000 ex GST, agreed in writing before work starts. Each later stage is quoted before it begins. Hosting and support are a separate monthly cost, quoted up front with stage one.

How long does it take?

We plan a first stage to go live within four to six weeks of the go-ahead, with a demo every week while it’s being built.

Is our data ours?

Yes. Your records belong to your business. You can export them at any time.

Can you work with the software we already have?

Connecting the software you already use is the SI in SI30: system integration. Every program allows different things through its connection, and some depend on your plan, so we check what yours allows before we put a price on the work. If it has a way in for other software, we can usually connect it. If it doesn’t, we’ll tell you before you spend anything.

Do we have to replace the software we use now?

No. Often the best first stage connects what you already have, like Xero or your job software, and fills the gaps around it.

What if the first stage doesn’t suit us?

You commit to one stage at a time. The first stage is tried on real jobs alongside your old way before it’s switched on, and your team uses it before you decide on anything more.

Who will we deal with?

Our team, from the first conversation to go-live. We’re a small team, and the team that builds your system is the team you talk to. No account managers and no hand-offs.

What we can do depends on the records your business keeps and what your software lets through. We check before we quote.