Kerem Uslular

iOS Software Engineer

Polished iOS apps, built right.

Swift, clean architecture, smooth motion, and full App Store delivery.

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Shipped & Live on the App Store

Apps

Still app icon

Still

Calm Breathing & Stress Reset

A stress management app built around one-tap logging and guided breathing exercises. Includes a full Apple Watch companion, real-time heart rate monitoring with HealthKit, home screen widgets, Siri Shortcuts, and iCloud sync — all with a focus on privacy and beautiful, haptic-driven animations.

Technical Highlights

  • Programmatic UIKit (no storyboards) with SwiftUI for Watch app & widgets
  • CoreData + CloudKit for automatic iCloud sync with conflict resolution
  • HealthKit integration — background heart rate monitoring, spike detection, Mindful Minutes
  • Full Apple Watch app with WatchConnectivity bidirectional sync
  • Custom Core Animation breathing visuals — radial gradients, glow effects, haptic-driven phases
  • WidgetKit — multiple widget families, Watch complications, Live Activities
  • Face ID / Touch ID lock via LocalAuthentication
  • Siri Shortcuts with NSUserActivity donations
  • RevenueCat subscription management with feature gating
  • Repository pattern, service layer architecture, Combine, async/await

Built With

Swift UIKit SwiftUI CoreData CloudKit HealthKit WatchKit WatchConnectivity WidgetKit Core Animation LocalAuthentication Siri Shortcuts Combine RevenueCat SnapKit Swift Charts
App Store Website
Songstamp app icon

Songstamp

Daily Music Journal

A music journaling app where you pick one song each day to capture how you're feeling. Features a beautiful dark-mode timeline, calendar view with album art, detailed stats and insights, shareable weekly recaps, and full data export — built entirely in SwiftUI with SwiftData.

Technical Highlights

  • 100% SwiftUI with iOS 17+ APIs and SwiftData for persistence
  • iTunes Search API integration with debounced search and task cancellation
  • Cross-platform music links via song.link (Odesli) API — Apple Music & Spotify
  • PDF year recap generation from SwiftUI views using ImageRenderer
  • Full data export — JSON, CSV, and beautifully formatted PDF
  • WidgetKit — home screen and lock screen widgets with App Groups data sharing
  • Shareable weekly recap card generation
  • Custom spring animations, glassmorphism UI, haptic feedback system
  • RevenueCat subscription management with feature gating
  • MVVM architecture with service layer, async/await, Combine

Built With

Swift SwiftUI SwiftData WidgetKit PDFKit ImageRenderer App Groups Combine RevenueCat iTunes Search API song.link API
App Store Website

What I Work With

Technical Expertise

UI Frameworks

SwiftUI, UIKit (programmatic, no storyboards), and both in the same project. Experience migrating legacy Objective-C and deprecated frameworks (Texture) to modern Swift and Auto Layout.

Modular Architecture & SPM

Refactoring monolithic projects into modular, configurable frameworks. Building reusable Swift Packages from scratch and shipping white-label apps from a shared codebase.

On-Device ML & Core ML

Bringing cloud-trained models on-device with Core ML and PyTorch Lite. Computer vision, real-time classification, and building custom SPM packages to bridge ML framework gaps.

Data & Persistence

SwiftData, CoreData, CloudKit, UserDefaults, App Groups, NSUbiquitousKeyValueStore. Local-first design with automatic iCloud sync and conflict resolution.

Apple Watch & HealthKit

Standalone Watch apps with SwiftUI, WatchConnectivity for bidirectional sync, Watch complications. HealthKit background delivery, heart rate spike detection, Mindful Minutes.

Widgets & Extensions

WidgetKit for home screen, lock screen, and Watch. Live Activities. App Groups for data sharing. Siri Shortcuts with NSUserActivity donations and deep linking.

Monetization

StoreKit 2, RevenueCat integration, subscription paywalls, feature gating, free trials, lifetime purchases, and restore flows.

Concurrency & Reactive

Modern Swift concurrency (async/await, actors, @MainActor), Combine publishers, task cancellation, and background processing.

Animations & Haptics

Core Animation layers, SwiftUI transitions, spring animations, radial gradient effects, and a custom haptic feedback system.

Architecture & Quality

MVVM, service layer, repository pattern. Protocol-oriented design, dependency injection, unit tests, accessibility (VoiceOver, Dynamic Type). Experience with codebases powering 2,000+ apps.

Cross-Platform

Android development alongside iOS. Unity for game development. TypeScript backends. Comfortable working across the full stack when needed.

Legacy Migration

Objective-C to Swift migrations, deprecated framework replacements, and incremental modernization of large existing codebases without disrupting production.