Miguel Estrella
ES

01 / Overview

Explore ZTAR

A platform for
barbershops.

Built independently across product, UX/UI and engineering.

ZTAR connects bookings, staff operations and business management across web and mobile.

Platform
Web · iOS · Android
Role
Product Engineer & Designer
Year
— Present
ZTAR web dashboard with revenue, appointments, team availability and the day's operations.
Web dashboardDemo account
ZTAR native mobile app in an iPhone, showing today's earnings, business shortcuts and upcoming appointments.
Native mobile app

02 / Mobile & Operations

Managing a barbershop
from a phone.

Appointments, revenue and team performance in one mobile app.

ZTAR mobile calendar for a professional, with timed appointments and gaps in the working day.

Agenda

Appointments and daily availability.

ZTAR mobile analytics with revenue over time, services sold and a breakdown of commissions, supplies and expenses.

Business overview

Revenue, costs and what stays with the shop.

ZTAR mobile team analytics comparing services and revenue across six professionals.

Team performance

Services and revenue by professional.

03 / Website Studio

A configurable
website system.

I built a theme system that lets each barbershop present its services, team and work through its own public website.

Choose a theme

One barbershop. Six themes.
Scroll inside the preview to explore the site.

StarWebsite preview
Star

04 / Payments & subscriptions

Subscriptions and
booking deposits.

I built the payment integrations and the server-side logic that connects them to ZTAR.

01 / Platform subscriptions

Plan selectionBarbershop
RebillArgentina
Lemon SqueezyInternational
ZTAR / SERVER-SIDEVerify & processSignature validation and duplicate event handling.
Subscription stateBilling and product access

02 / Booking deposits

BookingCustomer
Mercado PagoDeposit payment
ZTAR / SERVER-SIDEVerify & reconcileCheck payment details and apply booking rules.
Payment recordLinked to the booking

03 / WhatsApp reminders

Available creditsBarbershop balance
ZTAR / SERVER-SIDEReserve a creditCheck eligibility and hold one credit before sending.
Meta WhatsAppShared sender
Delivery outcomeConsume on delivery; release on definitive failure.
Implementation

Provider integrations, webhook handling and the business rules behind subscriptions, deposits and message credits.

05 / Engineering

One system across web,
mobile and public sites.

Separate interfaces connected through shared data and business rules.

WebNext.js
ZTAR web dashboard showing business revenue, appointments and team availability.
MobileReact Native · Expo
ZTAR mobile cash screen showing the day's balance and recent transactions.
Public siteNext.js
Iran Recalde's public ZTAR site with booking and contact options.

Business logic & integrations

TypeScript · Server-side rules · Payment webhooks

Data & identity

Supabase · PostgreSQL · Auth · Storage · Realtime

06 / Launch & iteration

In use by real
barbershops.

ZTAR is live across web and mobile, and continues to evolve with feedback from the people using it.

In the wild

Booking links, shared by barbers.

Iran Recalde's Instagram profile, identifying him as a ZTAR ambassador and showing 642 thousand followers.

Iran Recalde

ZTAR ambassador · Booking link in bio

Visit site
Luaces Barber's Instagram profile displaying an urban-cuts.ztar.pro booking link.

Urban Cuts

Booking link shared on Instagram

Visit site
Nico D' Tzionn's Instagram profile displaying a tzionn.ztar.pro link.

Tzionn

Public site shared on Instagram

Visit site
Pehuen Exequiel's Instagram profile displaying an el-cordobes.ztar.pro link.

El Cordobés

Booking link shared on Instagram

Visit site

Available on

App Store Google Play Web

Ongoing work

Built independently and improved through use, feedback and continued development.