Accepting new projects · Q3 2026

Custom apps,built with AI,shipped in21 days.

One custom app, built around how your business actually runs. Shipped in 21 days, built around exactly what you need. You own every line when I walk away.

Custom
Built only for what you need. Nothing you don't.
21
Days to a working v1. Not weeks. Not months.
1×
Builder, end to end. No middleman.
100%
Yours. Code, data, accounts, domain.
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What I build

Six things your business
actually needs.

Not a stack of SaaS seats. Not a dashboard on top of a spreadsheet. One custom app built around how your shop already works, opened every morning by the people who run it.

S.01 / Operations

Scheduling & dispatch

Your team knows where to be and what to do, without a 5am group-chat scramble. Techs, crews, coaches, drivers, cleaners, whoever.

S.02 / Customers

Intake & booking

Customers, tenants, players, or members sign up on a link, not a screenshot. Your calendar and roster handle themselves.

S.03 / Office

Back-office tools

One tool your office manager stops quitting over. The spreadsheets, stickies, and three-tab workflows, gone.

S.04 / Records

Custom CRM

Every customer, member, or family in one searchable place. Not Salesforce. Not Monday. Yours, built around how you actually run.

S.05 / Cash flow

Billing & invoicing

Invoices fire the second a job, session, or order closes. Stripe, ACH, or on account. No more midnight typing.

S.06 / Control

Owner dashboard

Revenue, open work, A/R, who owes you what. The one number you need to see before Shabbos.

Before & after

What your business looks like on day 22.

The shops winning right now aren't working harder. They're running on one tool that does the job of ten, built around how they actually work, owned outright.

Yesterday's playbook

  • ×Software from 2015 that one ex-employee built
  • ×WhatsApp threads doing the work of a CRM
  • ×A whiteboard or group chat telling your team where to be each morning
  • ×Spreadsheets you can't trust, edited by four people
  • ×Invoices typed by hand, one by one, at night
  • ×An office manager stretched thinner every year

The AI-built edge

  • Modern stack you own outright. Any developer can pick it up.
  • Every contact, conversation, and task in one searchable place
  • Schedules and assignments in everyone's pocket, updated in real time
  • One source of truth. One database. One login.
  • Invoices generated and sent overnight, hands-off
  • An office manager with an afternoon again.
About

One builder. One client at a time.

I'm Zach Weiss. Brandeis CS, ex-backend engineer at Carbon Black, Brooklyn-based, and frum.

I build one custom app for one business at a time. No agency layers. No offshore handoffs. No account manager who schedules calls with the person actually writing code. You work with the builder directly, start to finish.

Modern AI tools let one person out-ship a ten-person team. You get the work of an agency in 21 days, handed over with every password, every repo, and every account in your name.

I answer my own phone. You text me directly.

How it works

Diagnose. Spec. Build. Train. Hand over.

Phase I
Diagnose.
One 45-minute call where I watch how your business actually runs, not how the org chart says it does.
Day 00
Phase II
Spec.
I write a plain-English document of what I'm building, what I'm not, and what it'll do on day 22. You sign it.
Days 01–03
Phase III
Build in public.
WhatsApp me anytime. No black box.
Days 04–17
Phase IV
Train the team.
Your team uses it before it's live. We fix the friction they find, not the friction I imagine.
Days 18–20
Phase V
Hand over the keys.
Repo transferred. Domains pointed. Passwords in your vault. I'm on call 30 days. Then the app is yours, alone, forever.
Day 21
What to expect

Built for exactly what you need. Nothing you don't.

Every app I build is made around one business: yours. Only the features you'll actually use, none of the bloat. The whole point is that you open it every morning and it makes your day easier. That's the only thing I'm measuring.

How we start
Two steps, all about you
No hard sell, no deck, no pressure. Just a careful look at how your business runs and a plan to make it better, shipped in 21 days and yours to own the day it's done.
Step one. The intake
  • We go deep on how your business actually runs, top to bottom
  • Every workflow, every headache, every thing you wish just worked
  • I listen, I watch, I ask, until I know your operation as well as you do
Step two. Your proposal
  • A plan built around exactly what you need, and nothing you don't
  • What I'll build, what it'll do for you, and the day it lands in your hands
  • Made for your business, and no one else's
Made only for you

Every screen exists because your business needs it. Nothing bolted on, nothing you'll never touch. The app fits the way you already work, not the other way around. If it doesn't make your day easier, it doesn't ship.

Yours, completely

Code, data, domain, and every account in your name the day it ships. You own it and you run it. No platform you're locked into, no one who can take it away. Built once, for good.

Submit an inquiry Or message on WhatsAppI'll get back to you fast. No pressure, ever.
Submit an inquiry

Tell me about your business. Talk or type.

A few quick details, then describe what you need in your own words. Easier to speak than to write? Tap the mic and I'll transcribe it. I'll have a proposal drafted before our first call.

What are you trying to fix?

Be specific. The manual work eating your team's day. The group chats pretending to be a CRM. The workflow everyone in the office hates. The more honest and detailed, the better the proposal I can write you.

Tap and start talking
Or message on WhatsApp