Saed Younis

Senior Mobile Engineer · Flutter & Dart

I build secure, cross-platform mobile apps for money-handling environments — owning end-to-end delivery of payments, passwordless authentication, and real-time experiences. Based in Istanbul, Türkiye.

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About Me

Senior Mobile Engineer specializing in secure, cross-platform application development with Flutter and Dart

Saed Younis

Senior Mobile Engineer · Flutter & Dart

Highly skilled Senior Mobile Engineer with extensive experience in Flutter and Dart, specializing in secure cross-platform application development. I own end-to-end delivery of complex features — authentication, payment flows, and real-time experiences — with a strong focus on security and user experience.

  • Phone/WhatsApp: +905421029945
  • City: Istanbul, Türkiye
  • Languages: Arabic (Native), English (Fluent), Turkish (Beginner)
  • Degree: B.Sc. Computer Systems Engineering — Al Azhar University, Gaza (GPA 4.0)
  • Email: saedbusiness2021@gmail.com
  • Freelance: Available

Adept at building cohesive design systems, improving release engineering with CI/CD, and partnering with backend and QA teams. Committed to delivering robust, reliable, and polished mobile solutions.

4
Years Building Mobile Apps
15
Money-Moving Flows Secured
95
% Cross-Platform Code Reuse
7
Locales Internationalized

Core Skills & Technologies

The tools and techniques I use to ship secure, polished mobile experiences

Flutter & Dart

Cross-platform iOS & Android with GetX and Bloc/Cubit

Passwordless Auth

Passkeys, WebAuthn/FIDO2, OTP fallback & step-up re-auth

Payment & Wallet Flows

Server-authoritative payments, idempotency & intent hashing

Mobile Security

Secure storage (Keychain/Keystore), certificate pinning & TLS

Real-Time Experiences

WebSockets & Socket.io with connectivity-aware reconnection

Clean Architecture

Clean Architecture, MVVM/MVC and robust state management

Design Systems & i18n

Token-based theming, light/dark mode and 7-locale RTL support

CI/CD & Release

GitLab pipelines, signed builds, hardening & obfuscation

Professional Journey

From building secure crypto & fiat wallets to shipping real-time, cross-platform apps end to end

Senior Mobile Engineer (Flutter)

Jun 2026 - Present

Better-Pro Limited · İstanbul, Türkiye

  • Spearheading payment and account features in a cross-platform crypto & fiat wallet, prioritizing security in a money-handling environment
  • Engineering core wallet flows: balances, deposits, withdrawals, transfers, exchange and card flows
  • Building secure passwordless auth, server-authoritative payments and real-time status updates

Senior Flutter Engineer

Jan 2026 - Jun 2026

HoyaPay · Türkiye

  • Shipped a complete passwordless auth system — passkeys (WebAuthn) with OTP fallback and step-up re-authentication
  • Implemented idempotency across 15+ money-moving flows with SHA-256 intent hashing to tamper-protect each transaction
  • Built an app-wide design system migrated across 250+ files and a GitLab CI/CD pipeline from scratch (signed, obfuscated builds)

Flutter Developer

Sep 2025 - Dec 2025

Freelance · Teacher–Student Platform

  • Built a cross-platform app with Clean Architecture and BLoC, achieving 95%+ code reuse across iOS and Android
  • Delivered real-time content management, payment processing and role-based access control
  • Integrated Arabic RTL localization and Firebase (Auth, Cloud Messaging, Analytics)

Full Stack Developer

Jun 2025 - Aug 2025

Freelance · Property Management Platform

  • Developed a responsive React + TypeScript frontend with Tailwind CSS and Vite
  • Built a scalable property management system with RBAC, full CRUD, advanced filtering and real-time notifications
  • Implemented i18n for Arabic RTL and English with dynamic locale switching

Flutter Developer

Oct 2023 - Jan 2024

Rest Fort

  • Led cross-platform Flutter development using Agile, ensuring high code maintainability and clean code
  • Engineered real-time chat with the Pusher SDK, improving engagement by 30%
  • Integrated payment gateways and published to the App Store and Google Play

Frontend & Flutter Developer

Jun 2023 - Jul 2023

Masar Application

  • Developed a responsive React.js admin panel for dynamic data management
  • Built and deployed a Flutter app on Google Play for data visualization
  • Integrated Laravel backend APIs for seamless web–mobile data sync

Flutter Developer

Apr 2023 - May 2023

Yumgott

  • Built a restaurant app with Swish payment integration and digital wallet features
  • Implemented authentication, interactive reels and social features (follow/like)
  • Applied MVVM architecture and Bloc state management with custom animations

Flutter Developer

Mar 2022 - Nov 2022

Bubbles – Social Media Application

  • Architected a social platform with real-time private and group chat using Socket.io
  • Developed event creation tools, Google Maps integration and QR-based friend requests
  • Used MVVM with Bloc for a robust, modular codebase

Flutter Developer

Jan 2022 - Feb 2022

Nabda Organization

  • Developed a data showcase application with form submission capabilities
  • Ensured UI responsiveness and cross-device compatibility
  • Collaborated with the team to identify and resolve defects, improving stability

B.Sc. Computer Systems Engineering

Sep 2021 - Present

Al Azhar University · Gaza

  • GPA 4.0 — top-tier academic performance
  • Excelled in Algorithms & Data Structures and active in coding competitions

Featured Projects

Secure, cross-platform mobile apps — from fintech wallets to real-time social platforms

Confidential

Crypto & Fiat Wallet — Better-Pro

Cross-platform wallet with secure deposits, withdrawals, transfers, exchange and card flows in a money-handling environment.

Flutter · Payments · Passkeys · Real-time
Confidential

Payments Platform — HoyaPay

Passwordless auth (WebAuthn) with idempotent, intent-hashed money-moving flows and a design system migrated across 250+ files.

Flutter · WebAuthn · Idempotency · CI/CD
YumGot App

YumGot Restaurant App

Restaurant app with Swish payment integration, digital wallet and social features

View Details
Bubbles Social Media

Bubbles Social Media

Real-time chat platform with event creation, Google Maps and QR friend requests

View Details
Masar Application

Masar Super Store

Cross-platform app with a React admin panel and Flutter mobile app on Laravel APIs

View Details
Teacher–Student Platform

Teacher–Student Platform

Clean Architecture + BLoC app with payments, RBAC and Arabic RTL (95%+ code reuse)

View Details
Rest Fort

Rest Fort

Cross-platform Flutter app with real-time Pusher chat and payment gateways

View Details
Nabda Organization

Nabda Charity App

Data showcase application with form submission and cross-device compatibility

View Details

Let's Connect

Ready to bring your ideas to life? Let's discuss your next project

Get In Touch

Phone/WhatsApp
+905421029945
Email
saedbusiness2021@gmail.com
Location
Istanbul, Türkiye
LinkedIn GitHub