Vivienne Fosh

Sole engineer on a private, pre-launch cross-platform AI product line, in development since mid-2025 (architecture walk-through available in interviews).

• One Kotlin codebase shipping an AI assistant to Android, iOS, desktop, and web — with the backend in Kotlin as well, including a GraalVM native-compiled service; the build generates its own CI config and deployment manifests, gated by a drift

Fixed-scope engagement for Charter Communications' enterprise KMP migration; distributed team of ~50 contributors across US and India time zones. Engagement scope completed on schedule.

• Architected the shared Kotlin platform replacing a legacy Android app previously built by 70+ engineers: Android + Kotlin/Wasm web from one codebase. First production release in 3 months; the web app 2 months la

Build & platform engineering for the KMP monorepo behind ~25 white-label grocery apps in the App Store and Play Store — retail brands serving shoppers across the US.

• Re-platformed CI twice across 40+ repos (four on-prem Mac Studios → GitHub Actions cloud runners → Bitrise, an MVP I built and proved on my own initiative): builds that ran well over an hour and stacked into half-day waits on same-

Mission-critical aviation software (United Airlines). Night-shift contract engagement; 20-person distributed team.

• Stepped into a stalled project, unblocked the team, delivered the release within 2 months.
• Led MVC → UDF migration with zero regressions. Cut build times 75% through modularization. Mentored the team on KMP adoption across iOS and Android.
• Designed a generic async/await API lay

Joined as iOS Technical Lead to drive the platform rewrite that preceded the company's acquisition (Napster, April 2024).

• Rewrote the app from UIKit to SwiftUI incrementally without disrupting releases. Built a queue-based navigation system handling unlimited sequential fullscreen views without state corruption.
• Open-sourced the navigation as SwiftUI-Flows (github.com/lonkly/SwiftUI-Flows).

Hired as iOS Architect; promoted to VP of Engineering. Led product development across iOS, backend, and KMM.

• Shipped the iOS app from zero in 6 months: vertical video feed with prefetch (AVQueuePlayer), server-driven UI, Core Bluetooth hardware pairing.
• Adopted KMM during its 2021 alpha — shared models and C/C++ video decode logic across iOS and Android.
• WCAG 2.1 AA throughout core flows: D

Shipped SwiftUI to the App Store in December 2019 — six months after the framework launched.

• Built the app on unidirectional data flow (Combine + RxSwift); profiled with Instruments and cut view-hierarchy depth and redundant redraws to hit scroll-performance targets.
• Built a type-safe API response parser shared between web and mobile.
• Led code reviews, mentored the team, and ran internal ta

Led mobile from the Ciklum spin-out through Series A & B; grew the team from 8 to 12 native developers.

• Migrated the codebase from Objective-C to Swift across Swift's breaking 1.0–3.0 versions without interrupting releases; supported iOS 6–12.
• Built a cross-retailer pricing engine, interactive map routing, and multi-store synchronized shopping lists.
• Led the reactive migration from Reactive

Led a hybrid iOS/Android team (3 → 12) on enterprise retail, medicine, and security projects; adopted Swift from its first beta in 2014.

• Ported a large Objective-C codebase to Swift; owned the design system and core libraries.
• Organized public tech meetups on reactive programming.
• The project spun out of Ciklum as the standalone company Basket — I moved with it as Head of Mobile.

Social platform with 10M+ installs — 99% crash-free stability in the pre-ARC era, when one memory-management slip crashed the app for millions.

• Redesigned the app architecture and memory usage; migrated the entire project to ARC.
• Early ReactiveCocoa adopter in Objective-C; built a server-driven UI form-builder before it was an industry pattern.
• Optimized photo feeds to 60 fps with image cac

Developed screen navigation and apps from scratch for both iOS and Android working on various outsourced projects.
Extensive CoreData / SQLite work, managing multiple contexts and overseeing database schema migrations, ensuring data integrity and performance.
Led the revamping of the network and repository layers for a media-centric app, integrating YouTube APIs for enhanced content accessibilit

Developed applications on early Android versions (1.6, 1.7, 1.8) and iOS 4,
adapting to the evolving mobile platforms.
Ported multiple games and apps from absolute to relative layouts, updating them to support various screen resolutions.
Involved in Android development, often implementing iOS designs and anticipating the development of Android's own design system.
Worked on diverse iOS projects in

Developed backend components utilizing JavaEE, Spring 2.5, Hibernate 3, Java, Tomcat, and JUnit, showcasing a strong foundation in backend technologies.
Created games and applications for Android 1.5 and 1.6, demonstrating early adoption and expertise in Android development.