Sergey Kononenko Email & Phone Number

Berlin, De

Berlin, Germany

- Led the complex development of an iPad app for pharmacists.- Implemented a modular architecture, reducing code duplication by 40% and accelerating feature development.- Established a common coding standard across the iOS team, improving code consistency.- Developed real-time parcel tracking, increasing user engagement by 30%.- Mentored junior developers through code reviews and pair programming.

Minsk, Belarus

- Developed an investment handling module for a mobile client in Swift from scratch.- Created and implemented women’s health monitoring functionality, expanding the app’s target audience and increasing its value.- Implemented an intuitive UI for easy data tracking, positively impacting user metrics.- Ensured the new feature fully interacted with other modules, improving usability and the integrity of the user experience.

- Developed a module to provide technical safety briefings to employees through a mobile app for construction project management.- Implemented form management and editing functionality, eliminating paperwork and reducing survey processing time.- Implemented an offline mode, allowing the app to generate reports without connecting to a server and to download data later, which led to the engagement of four large clients in hard-to-reach locations.- Migrated the project from CocoaPods to Carthage, speeding up the app build by 40%.

- Developed a mechanism to synchronize order data between the mobile app and the server.- Created an order management interface with grouping by status, reducing the average order processing time for couriers from 5 minutes to 2 minutes.- Integrated offline mode with automatic synchronization, ensuring uninterrupted work for couriers in areas with unstable internet.- Developed an iOS app for quick Wi-Fi router setup via mobile devices. Optimized the process of updating router firmware via the mobile application.- Created a step-by-step interface with automatic data validation, reducing configuration errors by 60%.- Implemented automatic connection diagnostics functionality, reducing troubleshooting time from 30 minutes to 5 minutes.- Developed a mechanism for displaying and navigating PDF and EPUB documents with support for large files.- Optimized EPUB rendering, reducing page load time by 40% and providing smooth scrolling.- Implemented asynchronous document loading and indexing, reducing app open time from 5 seconds to 1 second.

- Implemented delayed image loading with prioritization of visible content, reducing initial gallery load time from 5 seconds to 1.5 seconds.- Optimized the display of image previews, reducing memory consumption by 60% when viewing large galleries (1000+ images).- Migrated the codebase from MRC to ARC, reducing memory leaks by 95% and improving application stability.- Modernized the codebase using Auto Layout, ensuring interface adaptability and reducing development time for new screens by 40%.