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joni kay

20 followers

iOS/android developer with 14 years experience freelancer

20 followers

Joined 18 May 2026

jonikay89.github.io/...

Experience

14 years, 5 months

Bit Apps

Senior iOS & Android Engineer

Jul 2016 - Present (10 yr, 1 m) • remote • full-time

Led 11 production iOS/Android apps across fintech, media, gaming, security, and retail. Owned architecture and shared libraries.

- E-book/audiobook app — CarPlay, offline Realm, SwiftUI translation, widgets. MVC + ProcedureKit.
- Gambling platform — 9+ regional targets, shared CocoaPod core, iPad-first UI.
- Core library — Reusable CocoaPod/SPM. ~60% less duplication.
- 3D video platform — SceneKit, MVVM + Coordinator, NFT wallet, Microsoft auth.
- Photo competition — Socket.IO voting, swiping, IAP, 5 login providers. 334+ files.
- Crypto browser — VIPER, JS injection for dApps, Fortmatic wallet.
- Parking/fueling app — BLE detection, server-driven UI, QR payments, RxSwift.
- Cybersecurity agent — Device assessment, Twilio VoIP, QR enrollment, telemetry.
- Donations app — Card payments, fund browsing, in-app chat.
- News app — Real-time articles, push notifications, Core Data offline.

SceneKit/ARKit

SwiftUIRealmAlamofireMVVM/MVIWeb3/WalletConnect

Kotlin

JavaJetpack ComposeBluetooth LE

freelance

Senior developer

Mar 2012 - Present (14 yr, 5 m) • remote • freelance

sport.com

iOS Developer

Nov 2015 - Jul 2016 (8 m) • full-time

Developed a fitness-focused social sharing application for iOS, enabling users to track workouts, share photo/video progress, and engage with a fitness community. Implemented activity tracking with Core Location, social feed with push notifications, and real-time content sharing.

Objective-C

SwiftUIKitREST APIsCore LocationSocial FrameworksPush Notifications

Gini-Apps

iOS Developer

Jan 2013 - Nov 2015 (2 yr, 10 m) • full-time

Built and maintained multiple iOS applications in news/media and fintech domains during the early Swift era. One of the first developers to adopt Swift during its initial release, leading migration of legacy Objective-C components.

Major news application — Developed a real-time news app delivering articles, video content, and breaking news alerts. Implemented background fetch for seamless offline reading and push notification pipeline for instant alerts.

Parking payment application — Built location-based parking payment features with MapKit integration, GPS-based zone detection, and payment processing. Core Data for offline transaction queuing.

Early Swift adoption — Migrated components from Objective-C to Swift during the language's first year of release, establishing patterns and best practices for the team. Built new features in Swift while maintaining backward compatibility with ObjC codebase.

Objective-C

SwiftUIKitCore DataMapKitREST APIsPush NotificationsBackground Fetch