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Custom Web Application Development | Online Store, Booking System, SaaS MVP, Client Portal | React + Python, 10-14 Days, Source Code

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Highlights

  • Party decor for gatherings and celebrations
  • Digital download
  • Digital file type(s): 1 File
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Web App Development - web application development, custom web app, online store development, booking system.

From prototype to production in 10-14 days: online stores with Stripe, booking systems, client portals and SaaS MVPs. You own the code.

WHAT IT IS - WEB APP DEVELOPMENT
We build web applications end to end: user roles, payments, admin panels, integrations. Frontend in React + TypeScript, backend in Python (Django or FastAPI), PostgreSQL. Deployed, monitored, documented.

GREAT FOR: web application development, custom web app, online store development, booking system, saas mvp, client portal, react developer, python developer.

WHAT IS INCLUDED
- Clickable prototype approved before coding starts
- React + TypeScript frontend, Python backend, PostgreSQL
- User roles, auth, 2FA where needed
- Payments: Stripe, PayPal, Square
- Admin panel for your team, no developer needed for daily work
- Installable mobile web app (PWA), no app store review
- Daily progress updates, demo on request
- Deploy, backups, monitoring and full source code handover

RECENT PROJECTS (live demos at studio.cat404.online/works)
- Volt & Vale: Online store with Stripe, 12 days. Stripe checkout, 30-day test-ride returns and inventory sync with the showroom. First month of online sales matched the store floor.
- Paws & Stay: Booking system, 10 days. Owners pick dates, a suite and add-ons, then pay a deposit online. Phone bookings dropped 70%, double-bookings went to zero.
- Deskly: SaaS admin panel, 14 days. Desk and room booking with member billing and a live floor plan. The space runs at 78% occupancy with one part-time admin.

HOW IT WORKS
1. Buy this listing. In the personalization field describe your project in a few sentences: what it is for, links to anything you already have, deadline.
2. Within 24 hours we hold a 15-minute brief (chat or call) and fix the scope and the final price. The listing price is the starting package; anything beyond it is quoted before we start.
3. Prototype: structure and design approved by you before any code.
4. Build with daily updates and a demo link on request.
5. Launch: deploy to your domain or server, handover of code, access and documentation. Typical term: 10-14 days.

Warranty and Support
90-day warranty after launch: anything that breaks, we fix free. Average reply time is about 10 minutes, we are online 24/7. Monthly support plans available after the warranty.

DELIVERY
This is a custom digital service. The result is delivered as a deployed site / app plus source code and documentation (ZIP or repository access), not a physical item.

STACK
React, TypeScript, FastAPI, Django, PostgreSQL. Ukrainian studio, working with clients worldwide in English.

RELATED SEARCHES: web application, web app developer, online store, ecommerce website, booking system, saas mvp, client portal, react developer, python developer, custom software, stripe integration, full stack, app development.

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Listed on Sep 21, 2026
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