Kirlos Yousef

About

Senior iOS Engineer | SwiftUI & UIKit Expert | Proven Track Record in Developing High-Quality Mobile Applications | Passionate about Creating Seamless Mobile Experiences

Kirlos Yousef | Senior iOS Engineer

Birthday: 14 Feb 1998
Degree: Computer Science, BSc
Email: kirlosy@icloud.com

Age: 28
Phone: +1 (201) 777-1054

Senior iOS Engineer with 5+ years of experience, architecting scalable iOS apps, SDKs, and AI-powered solutions using Swift, SwiftUI, and UIKit. Proven success in performance optimization (achieving up to 35% latency reduction) and Agile collaboration. Published 8+ apps on the App Store. Experienced in leading development teams and mentoring peers to deliver high-quality, enterprise-grade mobile applications. Passionate about solving complex challenges with clean, maintainable code.

Feel free to connect if you'd like to discuss potential collaborations.

Skills

Swift
Objective-C
UIKit
SwiftUI
Cocoa Touch
Multi-threading
Xcode

Git
CocoaPods
Swift Package Manager
SDK Development
Networking
Third-party APIs and SDKs
RESTful APIs

Unit testing
TDD (Test-Driven Development)
XCTest
XCUITest
Localization
Auto Layout

MVC
MVVM
Core Data
Core Location
Notifications
UI/UX Principles
App Store Submission Process

Resume

Education

Computer Science, BSc

2017 - 2020

University of Debrecen (Debrecen, Hungary)

Graduated top of my class
Earned a fully funded scholarship

Side Projects

RaceMe!

GPS-powered running app with real and AI competitors, live leaderboards, and social challenges
Available on the AppStore

Built AI BOTs to simulate human running behavior, enabling competitive races without requiring a large user base
Implemented real-time leaderboards and social features (friend challenges, chat), achieving 99.8% message reliability
Integrated gamification (leveling, milestones), boosting average session time to 15+ minutes

AI SmartQuiz

AI-powered quiz app with custom dynamic quizzes
Available on the AppStore

Integrated OpenAI API to dynamically generate quizzes across 20+ topics, reducing question creation time by 70%
Developed a custom topic engine, allowing users to input any subject and receive tailored quizzes in <2 seconds
Introduced adaptive difficulty algorithms, increasing average session duration by 30%

Focus4

Productivity app with personalized AI suggestions
Available on the AppStore

Created a gamified focus tracker with streaks and calendar insights to boost user engagement
Designed an interactive animated virtual bird companion, boosting daily app opens by 25%

Professional Experience

Senior iOS Engineer

2025 - present

Sellou (Utah, United States - Remote)

Architected the ground-up rebuild of the Sellou video commerce app, to create a video-first user experience
Engineered the technical design of core features, including a secure transaction system for buyers and sellers
Led the full development lifecycle for Number special-project iOS apps, from concept to App Store submission

iOS Team Lead

2024 - 2025

Iomob - The Internet of Mobility (Barcelona, Spain - Remote)

Led a team of 5 iOS developers, delivering 2 enterprise apps by overseeing the full development lifecycle.
Mentored junior engineers, enhanced team skills through code reviews, and established rigorous code quality standards.

iOS Engineer

2021 - 2024

Iomob - The Internet of Mobility (Barcelona, Spain - Remote)

Built a scalable iOS SDK to unify 10+ mobility providers (including Uber & Bolt), cutting integration time by 40%.
Improved API performance using Combine and caching, reducing payload parsing time by ~25% in real-world tests.
Implemented rigorous unit and UI testing for critical SDK components, ensuring high reliability for enterprise clients.
Contributed significantly to enterprise apps, implementing performance-first architecture and core features.

Database systems Teaching Assistant

2019 - 2019

University of Debrecen (Debrecen, Hungary)

Taught Oracle SQL to 20+ students with personalized guidance
Conducted assessments and practical workshops, achieving a 90% student pass rate
Simplified complex topics to enhance comprehension and engagement