Kirlos Yousef

About

iOS Technical Lead with 5+ years of experience shipping 10+ apps and architecting scalable enterprise SDKs and high-performance consumer applications.

Kirlos Yousef | iOS Technical Lead

Location: Egypt | Open to Remote & Relocation
Experience: 5+ Years
Degree: Computer Science, BSc
Email: kirlosy@icloud.com

Website: kirlosyousef.com
LinkedIn: linkedin.com/in/kirlosyousef
GitHub: github.com/KirlosYousef

iOS Technical Lead specializing in concurrent systems, offline-first architecture, and complex third-party integrations. Proven technical leader who optimized core engines to reduce data usage by 35% and server costs by 20% through payload and caching optimizations, while guiding distributed teams to deliver 99.9% crash-free releases.

Open to remote roles and relocation—feel free to reach out.

Skills

Languages & Core

Swift (Concurrency/Actors), Combine
Core Data, SwiftData
Objective-C

Architecture

Clean Architecture, MVVM-C
Modularization (SPM)
System Design, Offline-First Patterns

UI & Frameworks

SwiftUI, UIKit
AVKit (Video), StoreKit 2
Accessibility (VoiceOver), WidgetKit

Quality & Performance

Instruments (Time Profiler, Leaks), LLDB
XCTest, XCUITest, Snapshot Testing
CI/CD (Xcode Cloud), Datadog

Integrations

Stripe (Payment Intents & Connect), Apple Pay
OpenAI, Supabase, Firebase
REST/GraphQL, Cloud Services (AWS/GCP)

Resume

Education

B.S. Computer Science

2017 – 2020

University of Debrecen • Debrecen, Hungary

Graduated with the highest GPA in the class with a fully funded scholarship

Side Projects

RaceMe

Competitive social running app (iOS/watchOS)
Available on the App Store

Engineered a hybrid real-time multiplayer engine combining Firestore for document sync and BrainCloud RTT for event-driven matchmaking, achieving low-latency state synchronization for concurrent racers
Developed a fault-tolerant background location service using CoreLocation, handling aggressive OS suspension policies to ensure reliable race tracking while the device is locked
Built a bidirectional WatchConnectivity layer to sync high-frequency race telemetry between iOS and watchOS, optimizing payload size to prevent WCSession throttling
Shipped Live Activities & Dynamic Island integrations, allowing users to track real-time race progress on the lock screen

Revera AI

Intelligent voice recorder & AI transcriber (iOS/iPadOS)
Available on the App Store

Architected a fault-tolerant transcription engine (SFSpeech/Whisper) with seamless offline failover
Reduced data upload usage by ~80% by building an AVFoundation pipeline to downsample 44.1kHz Stereo to 16kHz Mono on the fly
Ensured data integrity with a SwiftData persistence layer that handles audio interruption recovery and disk space monitoring

Amour

A Space fo Couples
Available on the App Store

Engineered a thread-safe, dual-layer image caching system (Memory + Disk) with strict cost limits (50MB), eliminating Out-Of-Memory crashes during infinite scroll sessions
Optimized data fetching by implementing custom PostgreSQL RPCs (Remote Procedure Calls) to handle heavy filtering (blocking/pagination) on the server, reducing client-side payload size by ~40%.
Built a universal routing system handling Deep Links and Push Notifications, ensuring consistent navigation state across cold launches and background operational modes

Professional Experience

iOS Technical Lead

02/2025 – Present

Sellou — Utah, United States (Remote)

Spearheaded iOS technical strategy and roadmap planning with the CEO, translating product goals into scalable iOS architecture
Architected V2 video engine (AVKit/HLS), reducing playback start time by 40% via intelligent pre-buffering and HLS optimization
Reduced app bundle size by 20% using On-Demand Resources (ODR) and Asset Slicing for non-critical resources
Built secure Stripe Connect module handling payouts and ensuring PCI compliance
Engineered the “Plot My Calories” AI vertical from 0-to-1 using OpenAI Vision and Swift Actors, decoupling heavy processing from the UI to maintain 60fps interactions during analysis
Established automated CI/CD pipelines for both production apps, reducing release cycle overhead by 50%

iOS Team Lead

02/2024 – 02/2025

Iomob – The Internet of Mobility — Barcelona, Spain (Remote)

Led a team of 5 iOS engineers to deliver 2 enterprise apps, serving thousands of users with a crash-free rate of >99.9%
Accelerated delivery velocity and reduced technical debt by implementing automated CI and enforcing standardized code reviews
Delivered LNER (UK Rail) app: Integrated Stripe tokenization for PCI-compliant payments, cutting checkout time to <8 seconds, and reduced trip-planning wait times by 35% via aggressive response caching and pre-fetching
Launched BrightBike (Palm Beach) app: Engineered a real-time bike-sharing system with offline-first map clustering and local receipt generation to support low-connectivity environments

iOS Engineer

02/2021 – 02/2024

Iomob – The Internet of Mobility — Barcelona, Spain (Remote)

Engineered the core iOS Mobility SDK used by Ford and Renfe, implementing a protocol-oriented architecture to normalize data from 10+ providers (Uber, Bolt), reducing integration time from weeks to <2 days
Optimized heavy data synchronization engine handling 10+ provider streams simultaneously using custom concurrent queues, maintaining 60fps scroll performance during heavy data ingestion
Achieved 90%+ code coverage on core SDK logic and zero critical crashes by implementing a comprehensive Unit & UI testing suite