Flutter Senior Developer Required (Marketplace App)

Job Description

We are looking for a Senior Flutter Developer (expert level only) to build a production-ready mobile application for our existing multi-language marketplace platform.

Project Overview

Mobile application only (Android & iOS) built with Flutter

Marketplace includes vehicles, real estate, and other products

UI/UX designs are fully ready

Existing backend + admin panel already manage all languages and content

The mobile app must fully integrate with the existing backend and admin panel

Core Features

Full marketplace functionality

Online payment integration

Maps integration (Google Maps / Mapbox)

Video support

Multi-language support (including full RTL – Arabic)

High performance and scalability

Technical & Security Requirements (Very Important)

Clean, well-structured, and scalable Flutter code

Clear architecture (Clean Architecture / MVVM / BLoC / Riverpod)

Strong focus on security best practices, including:

Secure API communication (HTTPS, proper token handling)

Secure authentication & authorization

No hardcoded secrets or API keys

Safe local data storage

Protection against common vulnerabilities (MITM, XSS, etc.)

Error logging without exposing sensitive data

Code must be auditable and maintainable long-term

Requirements

Senior-level Flutter experience only

Proven experience with:

Marketplace or large-scale applications

REST API integration

Payment gateways

Multi-language apps with RTL support

Ability to collaborate professionally with our existing backend team

Strong performance optimization skills (pagination, caching, smooth UI)

Full project documentation

Reusable and modular components

Post-delivery bug-fix warranty period

Clear communication and regular progress updates

Deliverables

Flutter mobile app (Android & iOS)

Integration with existing backend and admin panel

Firebase integration where needed

Optimized, secure, and scalable application

App Store & Google Play submission

(Developer accounts are already available)

To Apply, Please Provide:

Links to your best Flutter projects (App Store / Google Play)

GitHub profile or code samples

Short explanation of your preferred architecture and state management

Experience with marketplace or complex apps

Estimated timeline and fixed price

Confirmation that you can deliver a high-quality, scalable, and secure product

❌ Junior developers or generic agency proposals will not be considered.

🇪🇺 Preference for developers based in Europe or nearby time zones.