Catarina Serrano

- Full-stack mobile engineer on a social content-curation iOS app. Delivered major features end-to-end. from GraphQL schema and API integration through reactive MVVM-C architecture to immersive video-backed UI with Core Animation/Lottie.

- Owning CI/CD across 4 environments and 3 app targets.

- Developed and maintained features for PicPay’s award-winning iOS app (winner of iBest 2024 – Best Digital Bank), serving millions of users in Brazil’s competitive fintech market. - Partnered with designers, product managers, and engineers to deliver high-impact features, ensuring alignment with business goals and user experience excellence. - Proposed and implemented architecture improvements in a mono-repo environment, enhancing code reusability and long-term maintainability. Adhered to industry best practices (SOLID, CI/CD, Unit/UI testing) to optimize performance, stability, and scalability.

- Developed a pioneering stress management app for Apple Watch, focusing on Heart Rate Variability (HRV) analysis.

- Designed and implemented core features to track, visualize, and interpret HRV data in real-time

- Created intuitive watchOS interfaces that deliver actionable insights for stress reduction

- Optimized health data processing to ensure accurate readings while maximizing battery efficiency.

- Integrated with HealthKit to provide comprehensive wellness tracking across Apple ecosystem.

- Contributed to the app's evolution from concept (Zendō) to a launched product (Press Reset)