Karo Sahafi
Senior Ios Engineer @HelloFresh
Signup · Get unlimited contacts
WORK HISTORY
Senior Ios Engineer @HelloFresh
Berlin, DE
As a Senior Mobile Engineer, I worked across iOS (Swift/SwiftUI) and React Native to deliver high-impact features for both HelloFresh and Factor, with a major focus on the Loyalty Program.I was a key engineer behind the iOS Loyalty Hub, implementing dynamic milestone logic, scroll-based behaviors, gradient transitions, and theme propagation using custom SwiftUI environments. Performance remained strong at launch, with only 15 crashes in the first six months, frozen frames at 0.220%, and slow frames at 0.346%. I also resolved 22 major issues during pre-launch to support a smooth rollout.I completed the internal React Native training and contributed significant parts of the Factor Loyalty opt-in flow, collaborating closely with Android, iOS, backend, and product teams. I also participated in API discussions to support the new food-based reward model and presented the Factor Loyalty feature in a company-wide demo.I designed a scalable Hub Builder abstraction reused across HelloFresh and Factor to support baseline, alternate, saving-reward, and food-based reward structures. I also authored the Celebration Moments technical documentation used by iOS, Android, and Web to align behavior and UX logic.I worked cross-squad on the Cart Opt-In Entry Points experiment, identified a backend blocker, initiated alignment across Wallet, CartCore, Pricing, and Loyalty Core, and helped unblock the release. I also integrated Customer Wallet benefits as part of a Tiger Team initiative.I served as an on-call engineer for both the Loyalty rollout and the iOS platform, contributed to observability improvements, and delivered an internal talk on real-time iOS monitoring. I also improved test stability by adding an async utility to HFTestsFramework, along with mock and UI testing resources used by multiple teams.
EDUCATION
National Organization for Development of Exceptional Talents
High School, Mathematics
University of Tabriz
Bachelor’s Degree, Computer Science
Sharif University of Technology
Master’s Degree, Computer Science
SKILLS
ABOUT KARO SAHAFI
As a Senior Mobile Engineer with 9+ years of experience, I specialize in building scalable, high-performance mobile systems across iOS (Swift, SwiftUI, UIKit) and React Native. My work combines deep technical ownership with clear cross-team collaboration, especially in complex product environments where performance, reliability, and architectural clarity matter.At HelloFresh, I am a key engineer behind major Loyalty Program initiatives for both HelloFresh and Factor, working across iOS and React Native. I’ve delivered complex UI systems, improved performance and stability, collaborated extensively with backend and client teams, and influenced API design for new reward models. My work spans technical discovery, architecture, implementation, and production monitoring.Before HelloFresh, I spent several years at Divar (53M+ users), progressing to Staff iOS Engineer, where I shaped mobile architecture, created a design system and server-driven UI used across the app, established the Mobile Reliability team, improved crash-free sessions to 99.97%, and contributed to engineering processes, hiring, and career ladders.I enjoy solving hard problems, simplifying complex flows, and building systems that last. Whether in Swift or React Native, I care about code health, performance, clear architecture, and working closely with product, backend, and other client teams to ship high-impact features with confidence.
This profile is compiled from publicly available professional sources. Unifers is not affiliated with or endorsed by LinkedIn. Request removal of this profile.