Contact person: Cross-Platform Cloud Storage Apps for Tred (Android, iOS & Windows) — Auto Sync, Selective Folders, Virtual Drive

Phone:Show

Email:Show

Location: Guareña, Spain

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"We run Tred, a secure cloud storage platform. We need production-ready apps for Android, iOS, and Windows that deliver a polished, Google-Drive/Dropbox-level experience:

Selective folder backup & auto-sync

Reliable uploads/downloads with resume

Background sync and scheduling

Built-in preview (images, video, PDF, text)

Sharing via secure links

Windows app with a real, mountable virtual drive (appears as a drive letter in Explorer)


This is not a basic uploader. We want a clean UX, efficient sync engine, and robust error handling.

Scope (all platforms)

Auth (token/OAuth against our API)

Two-way sync (device ↔ cloud), conflict handling, retry & backoff

Selective folders, storage usage, offline files

Transfer queue with progress, pause/resume, bandwidth cap

Settings: Wi-Fi-only, battery/roaming guards, schedule (realtime/hourly/daily)

Theming/branding (dark blue), app icons & store assets


Mobile specifics

Android & iOS

Auto-backup of photos/videos (camera roll + any chosen folders)

Built-in video player (stream without full download)

Push notifications (completed uploads / errors)


> Note: iOS full-device VPN-style behavior is not required; app-scoped sync is enough. (If you can also handle iOS Network Extension in the future, note it.)



Windows desktop

Virtual Drive: mount Tred as a real drive (read/write, drag-and-drop)

Background service for continuous sync

Tray app: status, recent activity, quick actions

First-run wizard (pick folders, schedule, bandwidth)


Tech preferences

Mobile: Flutter (preferred) or React Native; native OK if justified

Windows: C#/.NET + filesystem driver or Dokany/WinFsp (or equivalent) for the virtual drive

Efficient delta uploads (chunked), parallelism, and low CPU/battery use

Clean architecture, documented code


API

We’ll provide endpoints for:

Auth, file list, upload (chunked), download, share links

Metadata (size, mtime, hash), storage quota

Webhooks/events (optional)


If you have a proven sync/drive architecture, propose it. If not, implement a standard chunked + hash-verified approach.

Deliverables

Android APK/AAB (Play-ready), iOS build (App Store-ready), Windows installer + auto-update

Full source code + build scripts

Config for staging/prod (API base URL, keys)

README + short admin guide

30-day bug-fix warranty after delivery


Acceptance criteria

Stable two-way sync with selective folders

Resume after network loss, no data corruption

Windows drive mounts reliably and survives reboots

Smooth video playback from cloud

Passes review on low/mid-range devices (battery/network usage reasonable)


Budget & timeline

Budget: up to €1,200 (fixed price)

Timeline: propose realistic phases; priority Android → iOS → Windows

We’re OK with milestones tied to working builds:

1. Android MVP (auth + selective backup + queue) – 30%


2. Android full (video preview + schedule + settings) – 20%


3. iOS parity build – 25%


4. Windows drive + installer – 25%




What to include in your bid

2–3 relevant apps you’ve built (sync, cloud, or virtual drive)

Brief plan: tech stack, libraries (e.g., Dokany/WinFsp), how you’ll handle conflicts & resume

Estimated timeline by milestone

Team size and who codes what


Nice to have

End-to-end encryption option (file-key on device)

Delta sync for images/videos (if feasible)

Crash/telemetry integration (Sentry, etc.)

Basic CI/CD setup" (client-provided description)