Software that holds up under real use

Bulletproof for BJJ, today's workout screen

Bulletproof for BJJ, training journal screen

OLi Tutor, learner home on desktop and a live role play session on mobile

Kudos Kids and Co, family menu on mobile

Kudos Kids and Co, child gallery on tablet

Kudos Kids and Co, child gallery on mobile

Nooma, people, performance and culture dashboard

Nooma, guided workplace investigation workflow

Sargood on Collaroy, bookings admin platform

Sargood on Collaroy, upcoming bookings on mobile

Sargood on Collaroy, booking request form on mobile

Bulletproof for BJJ· Mobile

OLi Tutor· Web & mobile

Kudos Kids & Co· Tablet & mobile

Nooma· AI HR platform

Sargood on Collaroy· Web & mobile

WHO WE WORK WITH

Founders building product companies, from idea-stage through to scaled product.

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Mission-led organisations serving people who can't afford for software to fail.

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Established teams scaling products that already have traction.

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FEATURED WORK

Recent work.

All case studies

Nooma dashboard for an HR practitioner: workflows in progress, performance, culture and risk indices, and activity by business unit and practitioner

PRODUCT STRATEGY · APPLIED AI · BUILD · ARCHITECTURE

Founders

O-HR

The AI engine for Australian HR.

OLi Tutor coaching a maths question over screen share on desktop, with a live voice role play session on mobile

APPLIED AI · CO-FOUNDER ENGAGEMENT · PRODUCT STRATEGY

Founders

OLi AI Tutor

An AI tutor built into the OLi platform. Practical AI that earns its place, not bolted on.

PRODUCT STRATEGY · UX/UI DESIGN · PLATFORM TAKEOVER

Founders

Kudos Kids

A closed social platform for primary schools, taken over live and rebuilt around consent.

Hybrid delivery

Local leadership, nearshore scale

Consultative

UX and product strategy at the core

Lean agile

Iterative delivery, minimal overhead

Accessibility scoped upfront

Designed for the people who actually use it

WHAT WE BUILD

What we build, and what we build it with.

Strategy through to shipped product. The stack is deliberately boring where boring is right.

Strategy

Product and commercial strategy
Strategy & Audit
Discovery and technical due diligence
Go-to-market and investor narrative

Design

Product and UX design
UI and design systems
Prototyping and concept testing
AccessibilityWe agree your accessibility target at kickoff and design to it from the first wireframe.

Build and run

Web applicationsReact, Next.js, Node, TypeScript, Postgres
Mobile applicationsReact Native, Flutter, native iOS and Android
AI, properly embedded
API development and integration
WebsitesWebflow
QA, release and infrastructure

Not sure which of these you need?

That's what the audit is for

HOW WE WORK

Three phases, one partnership.

Every engagement runs through the same three phases. What changes is where you start.

Visualise

Workshops, audience and business goals, value proposition. We pin the problem before we propose the solution.

01 · VISUALISE

Commercial and business strategy

Digital product strategy

User and market research

Ideation and prototyping

Proof of concept

Concept testing

Create

Prototype, test, design, build. Hi-fi from week one. Iterative delivery with the right team.

02 · CREATE

UX design

Product development

API integration

Quality assurance

Go-to-market support

Grow

Continuous improvement, support, optimisation. Product work is never done.

03 · GROW

Product management

Infrastructure management

Analytics and optimisation

Support

Digital product marketing

Continuous improvement

Alex, Mark and the Castle Digital team were great at working towards a product that suited our unique business needs.

James Daikin

General Manager

Sargood on Collaroy

The Castle team have been instrumental in bringing Nooma to life. A true partner in every sense.

Jessie Ivancic

CEO & Founder

O-HR

One thing led to another, and Mark and Alex came on as co-founders of Olympus Insights to build this with me. It's been an absolute world class experience ever since.