Introducing SessionHQ — our flagship SaaS
After months of engineering and iteration with real studio operators, our flagship SaaS is live — running nightly check-ins for dance, gym and martial-arts studios.
Read articleSoftware engineering
with taste.
Full-stack product work — flagship SaaS, web, mobile, cloud and AI — delivered with engineering rigour and a designer's eye.
Flagship Product · Just launched
Introducing SessionHQ
A full-stack SaaS built, shipped, and running real customers — a modern check-in platform for dance studios, gyms, and martial arts schools.
Class check-ins, beautifully simple.
Instant check-in
PIN · NFC · QR · multi-class
Square payments
Cards-on-file · auto-renew
Multi-tenant secure
Postgres RLS · per-studio isolation
Real-time analytics
Revenue · LTV · retention
Built with
Next.js 16
React 19
Cloudflare Workers
Supabase
Square
Tailwind 4
Sentry
Playwright
Founding partner
Havana on the Hastings
Port Macquarie's Latin dance community — Cuban salsa, bachata, urban kiz, rueda. SessionHQ was stress-tested at their front desk on Tuesday nights.
What we do
Services
Flagship SaaS, mobile apps, AI tooling, edge platforms — and the internal tools that hold it all together.
Full-stack SaaS
End-to-end product engineering — multi-tenant architecture, payments, auth, realtime. From first prototype to live customers, like SessionHQ.
Mobile apps
React Native & Expo, with custom Swift/Kotlin native modules when you need to go deeper. Ships on iOS and Android from one codebase.
AI tooling & agents
Claude Code skills, RAG and vector search, agent workflows, local-LLM pipelines. Practical AI that ships, not demoware.
Edge & serverless
Cloudflare Workers, Supabase, PlanetScale, Sentry. Global edge deployment, zero-downtime, observable by default.
CLIs & dev tooling
Internal CLIs, release automation, Homebrew taps, Claude Code plugins. The small tools that make a team ten times faster.
Technical leadership
Architecture, hiring, engineering culture, hands-on mentorship. Twenty years of shipping across startup and enterprise.
Also — visual work
Not just software.
Zack Design is software first — but Isaac also shoots photography & videography as Zemonstas. Latin dance events, travel, portraits, and everything in between. Many of the tools on the journal — color grading AI, deflicker runners, audio recut — were born in real editing sessions.
Photography
Videography
Color grading
Dance events
Follow @zemonstas
About
Twenty years of shipping.
Zack Design delivers high-performance software solutions built with engineering excellence. Led by Isaac Rowntree — Head of Tech at CamperMate, Software Engineer at Redbubble, and Senior Developer at Ray White Group before that.
Engineering leadership
Two decades across product, platform and team, with deep experience in:
- Software architecture for scalable, long-lived systems
- Full-stack development with modern frameworks
- AI integration — vector search, RAG systems, agents
- Cloud-native application development and DevOps
- Remote engineering team leadership and mentoring
What clients say
Engineering you can trust.
Zack Design rescued a huge project for MJ Penner consulting, re-building from scratch in only a couple of weeks what our previous contractor could not do in months. Isaac's engineering leadership has allowed us to make smarter decisions that have saved us thousands of dollars on every project we've engaged together.
Although Isaac's job title was Senior Developer, he performed many roles — instrumental in all facets of digital development and marketing. Lead architect on the AWS migration, lead generation, intranet builds, and SEO. Values that enhanced not just the dev team but the whole company. I would happily re-employ him — a valuable asset to any team.
Isaac and his team at Zack Design have been an integral part of our online success. Their technical expertise, software development skills, and project management work is outstanding. I would not hesitate in recommending their services.
Tech stack
The tools we reach for.
Modern, proven, and boringly reliable — so products ship faster and stay standing.
TypeScript
Next.js
React Native
Cloudflare
Supabase
PlanetScale
Typesense
Sentry
Writing
All writing
From the journal.
Notes on engineering, products shipped, and lessons from the field.
Get in touch
Let's build something.
Email us
For inquiries, proposals, or questions about your software project — drop a line.
[email protected]