Sergey G. Email & Phone Number

Porto, PT

• A product company with 250+ employees developing whitelabel crypto wallet
• Optimized the CI/CD build automation process, reducing pipeline wait time by ≈60%.
• Simplified and expedited the cryptocurrency purchase flow, improving the conversion funnel from 32% to 73%.
• Introduced the UseCase business logic entity, decreasing the amount of logic in the presentation layer by ≈40%.Stack: Swift, SwiftUI, MVVM, RxSwift, FastLane, Tuist, SPM, Blockchain

• A product company with 500+ employees developing its own blockchain and exchange
• Achieved over 100,000 downloads by launching decentralized crypto exchange apps on iOS and Android.
• Improved performance and reduced development costs by 55% by leading a rewrite from Swift/Kotlin to Flutter.
• Increased App Store rating to 4.5 by resolving a critical multithreading auth bug, positively impacting 45% of users.
• Achieved a 180% faster wallet loading speed by optimizing and refactoring the data retrieval process.
• Covered 90% of the business logic code by developing and executing extensive test cases.Stack: Swift, SwiftUI, Kotlin, Flutter, CocoaPods, Architecture, VIPER, RxSwift, Blockchain, B2C

St Petersburg, St Petersburg City, Russia

• An outsourcing company with 300+ employees that collaborated with the largest retail in Russia
• Led and mentored a team of 2 people to successfully build and launch the application.
• Enhanced user experience by 60% by improving the performance of the main screen of the application.Stack: Swift, UIKit, MVP, Continuous Integration, Unit Testing, UI Testing, REST, JSON, Firebase, Agile

St Petersburg, St Petersburg City, Russia

• A product company with 10+ employees specializing in applications with a subscription model
• Increased subscription revenue by over 50% by executing impactful A/B tests on the subscription screen.
• Developed and published iOS apps from scratch before publishing 2 apps in 3 monthsStack: Swift, UIKit, MVVM, TDD, APN, Extension, Facebook Analytics, AppsFlyer, Cycript, Frida

St Petersburg, St Petersburg City, Russia

• A product company with 10+ employees specializing in the repair of computer equipment
• Developed and designed the application from scratch, including features such as registering repairmen, receiving orders, sending reports, and viewing statistics.
• Managed, operated, and supported 2 applications by leading a team of two, responsible for iOS app development, App Store communication, task distribution, and estimation of development time.Stack: Swift, Objective-C.