# CrossAppDev

> Egyedi digitális megoldások fejlesztése üzleti sikerre optimalizálva. Custom digital solutions for business success.

CrossAppDev is a software development company with nearly 20 years of experience building custom web applications, mobile apps, APIs, and business software. We serve operating companies, startups, and international businesses across Europe, America, and Asia.

## Services

- [Web Application Development](https://crossappdev.hu/szolgaltatasok/webalkalmazas-fejlesztes): Custom web apps — CRM, admin panels, client portals, internal tools. Built with Angular, React, TypeScript, Node.js, NestJS.
- [Android & iOS Development](https://crossappdev.hu/szolgaltatasok/mobil-alkalmazas-fejlesztes): Cross-platform mobile apps with native performance. Single codebase for both platforms.
- [All-in-One Solution](https://crossappdev.hu/szolgaltatasok/minden-egyben-fejlesztes): Web + Android + iOS in one compact system with shared backend and synchronized data.
- [AI Integrations](https://crossappdev.hu/szolgaltatasok/ai-integraciok): LLM integration (GPT, Claude, Gemini), image generation, chatbots, automatic moderation.
- [Cloud Solutions](https://crossappdev.hu/szolgaltatasok/felho-megoldasok): Docker, Kubernetes, CI/CD pipelines, auto-scaling, 99.9% uptime.
- [Custom Ecommerce](https://crossappdev.hu/szolgaltatasok/egyedi-webshop-fejlesztes): Custom webshop development with unique checkout flows, inventory management, ERP integration.
- [Cross-Platform Development](https://crossappdev.hu/szolgaltatasok/keresztplatform-fejlesztes): One codebase for web, Android, and iOS using Angular, Ionic, Capacitor.
- [Real-Time Systems](https://crossappdev.hu/szolgaltatasok/valos-ideju-rendszerek): WebSocket, SSE, push notifications — live dashboards, chat, collaborative tools.
- [API-First Development](https://crossappdev.hu/szolgaltatasok/api-fejlesztes): REST and GraphQL APIs with OpenAPI documentation, OAuth 2.0, JWT authentication.
- [System Integration](https://crossappdev.hu/szolgaltatasok/rendszerintegracio): ERP, CRM, payment gateways (Stripe, PayPal, Barion), shipping, external APIs.

## Tech Stack

- **Frontend**: Angular, React, TypeScript
- **Backend**: Node.js, NestJS, PHP
- **Database**: PostgreSQL, MySQL
- **Infrastructure**: Docker, Kubernetes
- **AI**: OpenAI GPT, Claude, Gemini, Stable Diffusion, Whisper
- **Real-time**: WebSocket, SSE, Redis pub/sub
- **Mobile**: Ionic, Capacitor

## Process

1. **Product Sprint**: One focused week to define goals, scope, and technical direction.
2. **Build Cycles**: Weekly deliverables, continuous demos, transparent progress.
3. **Launch + Iterate**: Fast deployment, measurement, data-driven continuous improvement.

## Why CrossAppDev

- Nearly 20 years of experience, hundreds of successful projects
- Simultaneous cross-platform development (web + mobile from one codebase)
- Revenue-focused: clients treat our apps as profit-generating assets
- Strict security and code quality standards
- Global reach: systems built for Europe, America, and Asia

## Contact

- Website: https://crossappdev.hu
- Email: hello@crossappdev.hu