Tinkoff is the largest digital bank in the world with ~30M users. I work on Core Chat Team that provides dependency for 4 products - Designed and implemented comments in Channel posts, collected functional and nonfunctional requirements, collaborated with multiple teams. The feature is used by ~3% of Channel's subscribers everyday - Implemented a solution for Source of Truth discrepancy, reducing the occurrence of bugs associated with Chat models. By synchronizing server and client models and establishing a unified model structure, resolved ambiguity issues and ensured accurate interpretation of model changes, enhancing system reliabilityStack: Swift, AVFoundation, GCD

Yandex is the largest technology company in Russia with +70M users/month. I worked on Yandex Music iOS app which has 30M users - Designed and integrated real-time analytics into a music player (the main feature of the app) using Grafana. It allowed other developers to monitor new and existing features, ultimately decreasing the number of errors by ~30% - Designed and developed the download feature of Playlist, Album, and Podcast components. Daily 2.5% of users use this feature - Found and fixed critical memory leaks in 10+ screens, causing crashes after ~15 min of using the appResearched Bazel/Buck build systems to address our project’s slow build time. Built a prototype with ~40% improved time - Implemented scripts to download and generate code for design-system icons, which improved developer experience. - Fixed and optimized scripts for all automated testsStack: Swift, Objective-C, Python, Ruby, AVFoundation, OperationQueue/GCD/DispatchSemaphore

Alfa-Bank Kazakhstan was a major local bank with a total of 600K clients - Designed and built from scratch an end-to-end feature to order the bank’s card online in a team of 2. The feature was used by 10% of all clients (60K) to order cards - Designed and developed reusable screens to select address, scan face with video and photo. Also implemented document scanning feature fetching ID card data and populating a form with it. It was later used by other 3 teams in their projects - Improved the performance of the app’s main page scrolling achieving a smooth 60 fps experience - Designed the dark mode of the app: collected and systemized all colors, implemented structure for modes and extended it to maintain several modes like Light/Dark/CustomStack: Swift, Vision, OperationQueue/GCD/DispatchSemaphore, Realm

ATFBank is a local bank with 60K iOS users and 4.7 stars on AppStore (the highest among banking apps in Kazakhstan at that time) - Designed the bank’s iOS app architecture and built it from scratch. Wrote around 40% of the codebase: money transfers, payments, client-operator chat and client profile page - Developed major reusable components: network layers, analytics, several UI components (entity pickers, card cells, loaders, etc.) - Managed 1 junior and 1 middle developers, and helped one of them to get promoted. Conducted iOS interviews with candidates, onboarded and mentored 3 new hiresStack: Swift, URLSession, GCD, RxSwift