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Hi, I’m Tim Dolenko, a senior iOS engineer with 9 years of experience delivering revenue-critical mobile platforms for large media companies and Silicon Valley startups. I specialize in scalable iOS architectures, white-label SDKs, and subscription-based monetization systems used by millions of active users. I enjoy leading cross-functional teams, automating CI/CD pipelines, and collaborating with backend teams to enable server-driven UI and ensure feature parity across iOS and Android.…Hi, I’m Tim Dolenko, a senior iOS engineer with 9 years of experience delivering revenue-critical mobile platforms for large media companies and Silicon Valley startups. I specialize in scalable iOS architectures, white-label SDKs, and subscription-based monetization systems used by millions of active users. I enjoy leading cross-functional teams, automating CI/CD pipelines, and collaborating with backend teams to enable server-driven UI and ensure feature parity across iOS and Android.

Tim Dolenko

AI Engineer, AI Prompt Engineer, App Developer, +1

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Hi, I’m Tim Dolenko, a senior iOS engineer with 9 years of experience delivering revenue-critical mobile platforms for large media companies and Silicon Valley startups. I specialize in scalable iOS architectures, white-label SDKs, and subscription-based monetization systems used by millions of active users. I enjoy leading cross-functional teams, automating CI/CD pipelines, and collaborating with backend teams to enable server-driven UI and ensure feature parity across iOS and Android.…Hi, I’m Tim Dolenko, a senior iOS engineer with 9 years of experience delivering revenue-critical mobile platforms for large media companies and Silicon Valley startups. I specialize in scalable iOS architectures, white-label SDKs, and subscription-based monetization systems used by millions of active users. I enjoy leading cross-functional teams, automating CI/CD pipelines, and collaborating with backend teams to enable server-driven UI and ensure feature parity across iOS and Android.

Available to hire

Hi, I’m Tim Dolenko, a senior iOS engineer with 9 years of experience delivering revenue-critical mobile platforms for large media companies and Silicon Valley startups. I specialize in scalable iOS architectures, white-label SDKs, and subscription-based monetization systems used by millions of active users.

I enjoy leading cross-functional teams, automating CI/CD pipelines, and collaborating with backend teams to enable server-driven UI and ensure feature parity across iOS and Android.

Skills

Experience Level

Expert

Expert

Expert

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Senior iOS Developer at Axel Springer

January 1, 2022 - Present

Architected and delivered white-label SDK solutions used across 3 products at Axel Springer, improving integration speed by 20% and supporting 3M+ MAU across BILD, Sport Bild, and Welt products. Delivered subscription and onboarding infrastructure contributing to €6M+ in annual revenue, including Purchasely StoreKit V1/V2 integration, Braze lifecycle campaigns, and Firebase-based A/B testing. Automated CI/CD pipelines with Fastlane and GitHub Actions, saving 25+ hours/week for development and QA teams. Led cross-functional teams driving €20M ARR through advertisement optimization and paywall transitions. Collaborated with backend teams on Kotlin/Spring REST APIs data layer, enabling server-driven UI approach and improving iOS-Android feature parity by 40%.

Senior iOS Developer at Spark Networks

November 1, 2020 - December 1, 2021

Led technical architecture for Zoosk and 14 premium dating apps, supporting MRR €350K. Implemented Clean Architecture with MVVM-C, RxSwift, and Combine reactive programming. Refactored monolithic codebase into 20+ Swift Package Manager modules with Swinject dependency injection, achieving 92% test coverage on revenue-critical chat features. Built and evolved developer-facing subscription modules shared across 7 niche dating apps, standardizing paywall configuration and A/B testing flows and significantly reducing new app setup effort.

iOS Engineer at Silicon Valley Startup (Whee)

July 1, 2018 - November 1, 2020

Built secure family platform using Swift/UIKit with MVVM pattern, TypeScript Cloud Functions, and CoreData offline synchronization. Worked directly with Yahoo Mail core team in a Silicon Valley startup environment, contributing to a $1M seed funding success by building an infinite scroll 60 FPS calendar, real-time multi-user todo-list.

Founder & iOS Engineer at Sispo

October 1, 2016 - November 1, 2018

Founded and operated a mobile development studio delivering 15+ iOS and Android solutions for international clients across the US, UK, DACH, and Australia. Directed delivery of student engagement platform for NSW Department of Education and UN World Food Programme mobile initiatives, serving 50K+ end users.