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. $25,000 flat. You own every line when I walk away.

$25K
Flat price. One number, no quote dance.
21
Days to a working v1. Not weeks. Not months.
1×
Builder, end to end. No middleman.
100%
Yours. Code, data, accounts, domain.
Next.jsSupabasePrisman8nClaudeStripeTwilioVercelPostgresOpenAITailwindTypeScriptNext.jsSupabasePrisman8nClaudeStripeTwilioVercelPostgresOpenAITailwindTypeScript
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, at a fraction of the cost, 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.
Daily Loom video. Live staging link. 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
Pricing

One price. One app. Yours.

No quote dance. No hourly meter. No "call for pricing." One number on the page so you know exactly what a working custom app for your business costs before you pick up the phone.

Standard engagement
Custom app, built with AI
$25Kflat
A working v1 of your custom app, shipped in 21 days. Built by one person, powered by AI. Yours to own the day it ships.
What's included
  • Discovery call + written spec signed off before a line of code
  • Full custom app on a modern portable stack (Next.js, Supabase, Prisma, n8n, Claude, Stripe, Twilio)
  • Deployed to your domain, your Vercel, your Supabase, your Stripe. Your accounts, not mine.
  • Every line of source code in a GitHub repo under your name, day one
  • Team training, written docs, and a Loom walkthrough for your office manager
  • 30 days of post-launch bug fixes at no extra cost
How payment works
  • 50% on signature. Holds your slot, kicks off discovery.
  • 50% on delivery. On working software, not on a go-live promise.
  • $200–$300/mo optional retainer for hosting, API costs, and tweaks. Cancel anytime.
  • Post-launch changes billed at $175/hr or rolled into retainer
  • Major new features scoped as a separate v2
The math

A $4K/month SaaS stack is $48K a year. Every year. Forever. And you don't own it. This app is $25K once. You break even in six months, and you compound from there.

Risk reversal

If I don't ship a working app in 21 days from kickoff, your deposit comes back. Not store credit. A wire. I'd rather eat the loss than drag a build into month three.

Submit an inquiry →Or message on WhatsAppQuick answer. No deck. No pitch. No pressure.
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