Kairo Digital builds its own portfolio of iOS and web apps — and puts the same product craft to work for clients: custom app development end‑to‑end, and senior interim product & delivery management when teams need a steady hand.
Each product does one job properly — from planning your day to remembering how a regular likes his fade. Two native iOS apps on the App Store, and a family of web apps — live, in beta, or ready to deploy.
No. 01
An AI day planner that builds your day around your real calendar — deep‑focus sessions, breaks, habits and a daily wrap‑up.
No. 02
A training timer that speaks the language of lifting: sets, reps, tempo phases and rounds — with almost no taps to start.
No. 03
Session planning, drills and match‑day management for rugby coaches — built for the touchline, delivered in the browser.
No. 04
A habit builder for children — small wins, gentle streaks and shared goals, already in use by keen parents.
No. 05
Your family's story, beautifully mapped — people, places, photos and the connections between generations.
No. 06
A platform for physiotherapy practices — treatment schedules, client accountability, and nutrition & supplement guidance.
No. 07
Every client's wishes, remembered — preferences, notes and photos in one secure place, ready before they're in the chair.
No. 08
The same studio that ships this portfolio can design and build yours — from first sketch to the App Store.
Everything is delivered by the founder — no layers, no hand‑offs, no outsourcing.
S/01
Fixed‑scope or milestone engagements for companies that want an iOS or web app built properly. Discovery, design, engineering and release — handled end‑to‑end by the person you first spoke to. The same craft that ships the Kairo portfolio, pointed at your product.
S/02
Senior day‑rate engagements (ZZP) inside existing teams — as delivery manager, project or programme manager, or product owner. Comfortable with enterprise environments and legacy estates; focused on unblocking teams, restoring cadence and shipping.
Practical LLM features shipped into real products — not demos.
From idea to a clickable, testable prototype in weeks.
Stuck build? Honest diagnosis and a plan to get it shipped.
Whether it's a Kairo product or your project, the cadence is the same: find the real problem, ship something useful fast, iterate in the open.
A short call to understand constraints, stakeholders and what "done" actually means.
Within two weeks, something clickable or running. Risky bits first: integrations, data models, the hard UX paths.
Short weekly cycles, transparent progress, minimal process. Code stays in your repos; decisions stay documented.
Clean handover with documentation — or a maintenance agreement if you'd rather the studio keeps running it.
Kairo Digital is the independent studio of Wouter Zandvoort — a career spent between product engineering and delivery leadership, building software and running programmes inside large enterprises. The studio is where those two worlds meet: a portfolio of its own apps, and a senior pair of hands for teams that need one.
The name is the brief. Kairos is the moment when acting is worth more than waiting — and every product and engagement here is judged by whether it helps someone seize theirs.
Most engagements start with a 30‑minute call — no pitch deck, no obligation. Tell me what you're working on and I'll tell you honestly whether the studio is the right fit.