Utilities · Private notes
iKeep
Private notes, organized: a Keychain-protected, Face ID–locked home for sensitive details across iPhone, iPad and Apple Watch.
Bahadır Sönmez · Berlin
iOS Software EngineerEight years. Millions of users.
I build high-scale consumer apps in e-commerce and fintech—and now ship my own: focused Apple-platform products where careful engineering meets a clear, human experience.
Selected work
Four ideas,
made tangible.
Each app starts with a simple question and becomes a product I use, refine, and ship.
Productivity · Daily planner
Bubbles
A daily task planner where tasks grow as deadlines close in—and pop with a satisfying finish when they’re done.
Games · Classic marble
Ballance
Tilt through floating 3D mazes: career mode, time attack, endless climb and online multiplayer.
Health & Fitness · AI wellness RPG
HealthBar
Turn Apple Health data into HP, quests and small wins, with optional AI guidance from Master Ronnie.
Career journey
The path to
building my own.
An engineering foundation, a startup, and years spent shipping iOS products at scale.
Istanbul Technical University
Chemical Engineering—an analytical foundation before moving into software.
Hergele Mobility
Co-founder and full-stack developer. Shipped multiple Flutter apps from scratch and shaped the product roadmap and technical architecture.
Hamurlabs
iOS Engineer. Refactored legacy projects and designed and published scalable apps with Swift, SwiftUI, Combine and HealthKit.
Migros One
Senior iOS Engineer. Built the grocery app and its food-delivery section from scratch: 4.7 App Store rating, 99.7% crash-free, and a development cycle two days shorter with Xcode Cloud.
BtcTurk
Senior iOS Engineer. Real-time WebSocket trading at 99.99% uptime, OAuth 2.0 security with full audit scores, and a monorepo migration that cut development costs by 30%.
Independent Apps
Designing, engineering and publishing iKeep, Bubbles, Ballance and HealthBar, owning the full product and release lifecycle.
About
Engineer’s rigor.
Maker’s curiosity.
I’m Bahadır, an iOS software engineer based in Berlin with eight years of experience building high-scale, consumer-facing apps in e-commerce and fintech.
I’m deeply experienced in Swift and SwiftUI and build on scalable foundations—Clean Architecture, MVVM-C and modularization—for products that serve millions of users with zero-fault tolerance. I speed up daily development with AI coding agents and LLMs, while keeping rigorous manual code reviews and architectural consistency.
Since June 2026 I work independently, owning the full product and release lifecycle of iKeep, Bubbles, Ballance and HealthBar—from product thinking to App Store release and ongoing iteration.
SwiftSwiftUIUIKitSwift ConcurrencyCombineCore DataHealthKitClean ArchitectureMVVM-CModularizationWebSocketOAuth 2.0XCTestXcode CloudFastlaneApp Store Connect
Have something in mind?