Mobile App (iOS + Android)

What you get

Your own app for iOS and Android — not a white label of some generic platform, but your app with your code repository and your backend. Cross-platform via Flutter, because that’s the only realistic way for a small team or solo developer to maintain two platforms simultaneously.

Three packages

💡 Pilot MVP — one platform, one core flow

You want to test an app idea before going all in. Ideal for validation.

• One platform (iOS or Android, by priority)
• One core flow (login + list + detail + one input action)
• Backend integration with an existing REST API or small backend skeleton
• Basic branding (logo, colors, app icon)
• TestFlight or Play Internal distribution (no store submission)

Effort: 3-4 weeks. Price: from €4,900.

🌟 Cross-Platform — iOS + Android, production

You want to ship a real app — in both stores, with all core flows.

• iOS + Android from one codebase
• 3-5 core flows (login, navigation, lists, detail, input, offline sync)
• Full branding (logo, colors, typography, icon, launch screen)
• Backend integration to existing API or a lean Go/Django backend
• CI/CD with Fastlane (automatic TestFlight + Play Internal Testing on push)
• Crash monitoring (self-hosted Sentry)
• Store submission (Apple Developer + Google Play Console, incl. metadata preparation)

Effort: 5-8 weeks. Price: €8,900.

Full-Stack — app + own backend + admin dashboard

You need everything from one source: app, backend, admin web. Fits when you have no backend or want to replace an old one.

• Everything from Cross-Platform plus
• Own backend (Go or Django, Postgres, REST + WebSocket)
• Admin web dashboard (Astro or Svelte) for your operations
• GDPR gold standard: Hetzner hosting, audit log, encrypted backups
• Multi-tenant capable (white-label-ready)

Effort: 8-10 weeks. Price: €14,900 + ~€25-50/month hosting.

Time-tracking with branding — standalone variant

By far the most common request. The market is crowded — but the combination of branded iOS+Android client and EU-hosted backend is not trivially available. Three options:

a) API connection to an existing service (Crewmeister, Personio, timetac, etc.) → app in your branding, data stays with the provider. Fast setup, dependency remains.

b) In-house backend on your own server → full data sovereignty. Hash-chain audit log for labor inspections. Aligned with the German Arbeitszeitgesetz 2026 amendment.

c) Managed backend on my Hetzner hosting → I run it for you, you just maintain the app content. Monthly flat fee from €50.

Price for variant b/c: from €8,900 — foundation is the existing backend prototype from my time-tracking project (Go + Postgres + Flutter). Saves you several weeks of development time compared to a greenfield build.

Technical stack

Mobile: Flutter 3.x, Dart. Offline via SQLite/Drift. Backend: Go (fast, single binary) or Django (when admin UI is desired). CI/CD: GitHub Actions + Fastlane. Monitoring: self-hosted Sentry, Uptime-Kuma. Hosting: Hetzner DE/EU or your server.

Why Flutter (and not React Native)?

• One codebase, two platforms — actively maintained by Google, stable release cycle.
• Native performance thanks to its own rendering stack (no JS-bridge overhead).
• Dart as a strictly typed language eliminates whole classes of bugs vs. JS/TS.
• Hot reload for fast iteration during development.
• I already use Flutter in three production projects (see below).

Proof — my own Flutter apps in production

My active Flutter expertise comes from three in-house projects:

• Time-tracking — Go backend + Flutter client, hash-chain audit
• 3motiBot — PSD2 banking integration, Flutter + Go
• gl-helden — PWA (Flutter Web + Capacitor), live at gl-helden.de

Not included

• Native-only features without Flutter equivalents (extreme camera special workflows, deeply integrated CarPlay/Android Auto): separate scope.
• App store optimization (ASO): not my focus — happy to refer a partner.
• UX design from scratch: I work with your CI; full design process is a separate service.

Process

1. Week 1 — scope workshop: core flows, data model, backend decision.
2. Week 2 — design alignment: mockups, branding implementation, icon set.
3. Weeks 3-N — build with weekly demos and TestFlight/Play-Internal builds.
4. Penultimate week — UAT with your team.
5. Final week — store submission or managed handover.

Prerequisites

• Apple Developer Account ($99/year) — I can set this up on your behalf.
• Google Play Console (one-time $25) — also set up on request.
• A contact person for content (screenshots, store listing descriptions).