I will build a custom app for your business using google antigravity ai

J
john_john1222
J
john_john1222
John S
build a custom app for your business using google antigravity ai
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build a custom app for your business using google antigravity ai

About this gig

Senior Software Engineer | SaaS & POS Systems Architect

I design and architect high performance digital solutions using Clean Architecture, building scalable, secure, and production ready software for startups and enterprises.

Core Expertise

SaaS MVP Development

End to end full stack applications built for speed, scalability, and growth.

POS & Business Systems

Cloud-based inventory, sales, and business management software tailored for modern operations.

Animated & Interactive Web Experiences

Immersive 3D websites and modern web applications built with advanced development tools.

I prioritize engineering excellence, performance optimization, and maintainable code to ensure your product is built to last.


Lets turn your vision into a robust, scalable product.

Contact me for a technical consultation.


  • Application Type

    • Web Application

  • Desktop Frameworks

    • Electron
    • Windows Presentation Foundation (WPF)
    • JavaFX
    • WinForms
    • GTKSharp
    • Uno Platform
    • Flutter for Desktop
    • Ultimate++
    • NW.js

  • AI Type

    • Chat
    • Shopping
    • Booking
    • Restaurant
    • Health & Fitness
    • Education
    • Entertainment
    • Finance
    • Medical
    • Travel
    • Lifestyle
    • Streaming
    • News
    • Productivity Tools
    • E-commerce
    • Kids
    • Real Estate
    • Gaming
    • Wallet App

  • Programming Language

    • C
    • C#
    • C++
    • Dart
    • Java
    • JavaScript
    • Swift
    • TypeScript
    • React

  • Web Frameworks

    • React
    • Angular
    • Django
    • Flask
    • Ruby on Rails
    • ASP.NET

  • No & Low-Code Builders

    • Lovable
    • Base44
    • Replit

Get to know John S

John S

Got a broken app or a big idea? I fix one and build the other

5.0(9)
  • FromNigeria
  • Member sinceJul 2025
  • Avg. response time1 hour
  • Last delivery2 months

  • Languages

    English, French, German, Spanish
Hey, I’m John 👋, An Experienced Full Stack Developer, Base44 Expert, and Automation Specialist offering custom web app development, SaaS solutions, API integrations, Shopify integration, QA testing, bug fixing, dashboard development, browser automation, Selenium bots, social media automation, and scalable business systems. I help startups and businesses build high-converting platforms, streamline operations, and launch powerful digital products with clean UX, reliable performance, and professional results. Non technical or advanced, doesn’t matter. Message me and let’s get it working, fast.

My Portfolio

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