01
Custom Software Development
Bespoke web and mobile applications built around how your business actually works.
Software · Social · Ads
We build software and grow your business online.
Siesbru is your digital partner - we build custom software and grow your brand online, from apps and automations to social media management and Google ad campaigns.
Taking on new clients
// what we do
const siesbru = {
builds: ["apps", "tools", "automation"],
grows: ["social media", "google ads"],
team: ["3 co-founders", "one goal"],
};
launch(yourBusiness); // → online 🚀6+
Projects delivered
3
People, one team
Local
SA-based team
Who we are
A small team that ships.
We are three co-founders with one goal: a CTO who builds the software, and a CEO and CMO who get to know your business and run your marketing. From booking systems and practical automations to social media management and Google Ads, we help businesses build the right tools and reach the right people.
What we offer
All services → Services
02
Social Media Management
We plan, create, and manage your social content so your brand stays active, consistent, and growing.
03
Google Ad Campaigns
Targeted Google Ads that put your business in front of the right customers - with results you can measure.
04
Business Tools & Automation
Internal tools, booking systems, and automations that cut out repetitive manual work.
05
AI Integration
Practical AI features that save time - from smart automations to intelligent assistants.
06
Fintech & Data
Finance-aware applications and SQL data solutions, grounded in accounting know-how.
Selected work
All work → Recent projects
Debt Allocation Platform
A financial application built under VVM to support debt allocation for a major banking client.
TraceBot
An automation bot that handles repetitive tracing tasks end to end, cutting manual lookup time.
Client Booking App
A booking platform that lets clients schedule and manage appointments with ease.
The people
Full CVs → Meet the team
Lourens Seitz
Co-founder & CTOThe builder. I turn the team’s ideas - and our clients’ - into working software.
View CV →
Pieter Botha
Co-founder & CMODriven, reliable, and detail-focused - I take pride in my work and in getting great results for every client.
View CV →
Jacob Johannes Mong
Co-founder & CEOPeople-first and naturally persuasive - I build real connections that turn conversations into clients.
View CV → Good to know
Questions, answered.
New to working with a software and marketing team? Here is what people usually want to know.
Will AI replace my staff or take control of my business?
No. We use AI as a tool to remove repetitive busywork - you and your team always stay in full control. Think of it as a helper that saves time, not a replacement for people.
I am not technical. Is this going to be complicated for me?
Not for you. We handle the technical side and build everything to be simple to use. We explain things in plain language and support you after launch - no jargon.
Is my business data safe?
Yes. We only connect the data a tool genuinely needs, keep it secure, and never share it. You own your data, always.
How much does it cost?
It depends on what you need - a small automation costs far less than a full app. We talk through your budget first and give you a clear quote before any work starts.
Do you only build software?
No - we also run social media management and Google Ad campaigns. Many clients use us for both: we build the tools and bring in the customers.
I just have an idea and do not know where to start. Can you help?
That is perfect. Tell us the problem you are facing and we will help you figure out the simplest way to solve it - no pressure.
Got a project in mind?
Tell us what you need - we’ll help you figure out the best way to build it.
Start a conversation →