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Karol Korzeń

@karolkorze

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iOS Developer at Prosoma building a CE-marked cancer-care app and an AI voice and text SDK for enterprise apps.

Poland

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At Prosoma, I became the primary iOS engineer for LivingWell Plus, a CE-marked medical device that helps cancer patients manage stress and anxiety. I took responsibility for the app’s architecture and releases, and built an offline-first sync engine with encrypted data storage and reliable retry handling.

I improved crash-free users from about 90% to about 99.5% and grew the test suite from around 120 to more than 1,800 tests. I also helped launch the app in new markets, including the Gulf region, with Arabic and full right-to-left support.

Alongside Prosoma, I worked on an AI customer service SDK for enterprise apps, fixing text and voice chat issues and owning its XCFramework and Swift Package Manager distribution pipeline. Earlier, I co-developed an e-commerce app from scratch and contributed to fintech, sports betting, and chatbot projects.

Experience

Work history, roles, and key accomplishments

Current

iOS Developer

Current

Prosoma

Jun 2023 - Present (3 years 3 months)

Primary iOS engineer for a CE-marked Software as a Medical Device, owning architecture, networking, offline-first sync, security, and 50+ App Store releases. Improved crash-free users from ~90% to ~99.5% and grew the test suite to 1,800+ tests.

Swift SwiftUI UIKit Swift Concurrency Combine Tuist URLSession Alamofire Firebase Realm Mixpanel FHIR Needle Sentry XCTest

iOS Developer

Client under NDA

Feb 2026 - Sep 2026 (7 months)

Developed a native iOS SDK for text and real-time voice chat with an AI agent, including localization for 30 languages and fixing bugs across text and voice chat. Owned the SDK build and distribution pipeline.

UIKit XCFramework GraphQL LiveKit WebRTC Apollo SPM Distribution Software Releases

iOS Developer

Tango Agency

Mar 2023 - Jun 2023 (3 months)

Implemented new features and maintained a shared codebase for a beauty salon booking app with two targets. Refactored SwiftGen configuration for clean asset sharing across multiple targets.

UIKit SwiftUI MVVM C Combine REST Firebase Google Analytics GTM SwiftGen

iOS Developer

CrustLab

Feb 2022 - Mar 2023 (1 year 1 month)

Developed client projects in e-commerce, fintech, sports betting, and SDK development. Co-developed a mobile e-commerce app from scratch, integrated Bitrise CI/CD, and worked on a cryptocurrency exchange app and a white-label sports-book app.