Kamil Jakubczak

Developed the Meta Wallet SDK—a fully configurable, client‑embeddable digital wallet solution that retrieves JSON configuration from AWS S3 to enable custom branding (fonts, themes) and support for multiple payment methods, including alternative digital wallets and traditional credit card processing.

Architected a white‑label React Native platform that enables turnkey client‑specific app creation and App Store submission within a single day—requiring zero developer intervention. Using a dynamic application key, the system automatically pulls JSON configuration, branding assets (icons, fonts), package metadata (bundle ID, version), and other resources to generate fully branded builds ready for distribution.

Designed and implemented an OIDC client to enable one‑to‑one hybrid authentication workflows and single sign‑on across mobile and web platforms. By leveraging Chrome Custom Tabs (Android) and SafariViewController (iOS) instead of WebView, the solution maintained cookie persistence and adhered to enterprise security standards while reusing the company’s existing authentication service.

Developed a cross‑platform React Native application for a leading eCommerce and mobile network client to manage subscriptions and bill payments on both iOS and Android. I integrated an OIDC authentication client using ServiceIdentity (.NET Core) to ensure secure, seamless user login and identity management across platforms.

Developed a cross‑platform React Native application for Focus Pointe Global on iOS and Android, enabling users to cast votes, complete surveys, and visualize results through an intuitive, polished UI built with NativeBase.

Developed a social shopping mobile app that enables users to catalog owned and desired products, share collections with peers, and solicit feedback. I designed and implemented gamification features like “trendsetter” leaderboards and social discovery mechanics to increase user engagement and foster community interaction.

Developed a cross‑platform React Native mobile application integrating a breathalyzer device for comprehensive sobriety monitoring. I implemented background activity detection (driving vs. walking), randomized and scheduled test prompts, SMS/push notifications, and automated safety checks—such as requiring photo verification when driving is detected—to ensure compliance and user accountability.

Served as a React Native Lecturer at Toptal Academy, designing and delivering a comprehensive curriculum that guided new developers through end‑to‑end mobile app development—from project setup and architecture to App Store and Google Play deployment—covering Firebase integrations, styling best practices, performance optimization (including native thread usage), and technology comparisons (React Native vs Expo and alternative cross‑platform frameworks). I shared actionable insights, advanced tips, and best practices to equip students with industry‑ready skills.

Developed a cross‑platform React Native application for care workers to streamline daily patient management by centralizing patient profiles, care tasks, and status updates. I enabled secure, real‑time visibility into patient well‑being for both caregivers and family members, improving communication, accountability, and overall care coordination.

I led the delivery of Golden Camel, a sports betting companion app designed to unify bet tracking, live scores, prop progress, and analytical insights into a single experience. The app consolidates bets from multiple sportsbooks and updates score and prop progress in near real time, providing bettors with a clear dashboard and advanced insights through optional premium analytics.

I was responsible for the end-to-end React Native mobile implementation, including defining architecture, building key features, and managing App Store submission. After a team transition, I took full ownership of the back end, designing and implementing a scalable AWS serverless stack (API Gateway, AWS Lambda, Amazon RDS with RDS Proxy, S3, and related infrastructure) with robust CI/CD pipelines. I also integrated data providers for live updates and implemented subscription monetization using native in-app purchases (Apple). My work ensured reliable live data delivery, a smooth user experience, and a solid foundation for growth and future enhancements.