From $4,000 · 3–6 weeks
Backend & API
API, database and admin panel
- Documented REST API
- PostgreSQL with backups
- Auth (Apple, Google, email)
- Admin panel
- Deployment and monitoring
Backend & APIs
The engineyour app needs.
API, database and admin panel, ready to grow. Or the integration that connects the systems you already use.
Backend & API from $4,000Integrations from $1,200
With AI Apps NJ, a backend with an API, a PostgreSQL database and an admin panel starts at $4,000. An integration between two systems starts at $1,200.
Architecture
One API for your app, your website and your systems.
Your clients use the app or the website; both talk to the same backend. Your data lives in one place, under your name.
- iPhone app
- Android app
- Website
- Admin panel
Your APIREST · documented · tested
- PostgreSQL
- CRM
- Notifications
- Your current system
What's included.
What the starting price covers. Anything else is quoted separately, at a fixed price.
From $1,200 · 1–3 weeks
System integration
Connect your CRM, spreadsheets, email or accounting system
- Connect 2 systems
- Webhooks and scheduled jobs
- Testing and documentation
Who it's for.
Real cases from businesses like yours.
| Business | Problem | Solution |
|---|---|---|
| App that needs a server | The app is ready but has nowhere to store data | API, database and admin panel |
| Shipping or remittance agency | Everything lives in spreadsheets nobody can find | Records with search, statuses and reports |
| Multi-location business | Each location keeps its own data | A central system with users per location |
| Legacy software | It doesn't talk to anything new | An API that connects it to your site, app or CRM |
How it works.
- 01We review the data and systems involved
- 02I design the API and show it to you documented
- 03I build it with tests and deploy it
- 04Optional monitoring and maintenance
See it working.
My own projects, live right now.
Web platform + iOS app + Android app + API
Polo App
A marketplace to book boarding, walks, grooming and vet care for pets.
- Online bookings between clients and businesses
- Maps and live GPS tracking of walkers
- Bilingual web, iPhone (Swift) and Android (Kotlin) apps
- Custom .NET API with an Azure database
Next.js · React · Swift · Kotlin · ASP.NET Core · Azure SQL · Google Maps
Built by Julian Rua
iPhone app live on the App Store + backend + website
Luka
Logging expenses by hand is tedious. Luka records and categorizes them automatically: it reads your iPhone purchases and your bank alerts.
- iPhone app in Swift, live on the App Store in English and Spanish
- AI categories, calendar, history and charts
- Custom Python backend that processes every expense
- Website built with Astro on Cloudflare
Swift · SwiftUI · Python · FastAPI · PostgreSQL · Astro · Cloudflare
Built by Julian Rua
Bilingual website with SkyScore and live weather
Drone Medellín
My aerial video business: I needed to quote over WhatsApp and tell clients whether the weather allows flying.
- Bilingual website with quotes straight to WhatsApp
- SkyScore: sky forecast with configurable alerts
- Weather from real airport METAR data
- Live Google reviews and tracking of visits that come from AI assistants
HTML · JavaScript · Supabase Edge Functions · PostgreSQL · Vercel · GA4
Built by Julian Rua
Pricing.
A fixed price, in writing, before we start. You pay part to start and the rest on delivery.
Backend & API
API, database and admin panel
From $4,000+ $149/mo · hosting and support (optional)
- Typical timeline
- 3–6 weeks
- Deposit
- 50%
- What's included
- Documented REST API
System integration
Connect your CRM, spreadsheets, email or accounting system
From $1,200
- Typical timeline
- 1–3 weeks
- Deposit
- 50%
- What's included
- Connect 2 systems
Technology: C# / .NET · Python / FastAPI · PostgreSQL / PostGIS · Supabase · Azure · Cloudflare Workers · Docker
Frequently asked questions.
Where is it hosted?
On the cloud you prefer (Azure, Supabase, Cloudflare, Railway), under your account. I'll recommend the cheapest option for your case.
Do I get documentation?
Yes: the API is documented so any developer can understand it.
Can my current systems be connected?
Almost always. If they have an API or export data, they can be connected. We check before I quote.
Tell me which systems you have.
I'll reply on WhatsApp, in English or Spanish. If you prefer, we can book a 20-minute call.