Сергій

IOS DEVELOPER
Sergii Afanasiev PROFILE
[open contact info](look above in the "contact info" section) iOS Developer skilled in Swift, Objective-C, system and custom UI, specializing in
[open contact info](look above in the "contact info" section) designing scalable solutions and white-label application architectures. Experienced in
Khmelnytskyi, Ukraine implementing MVVM, MVP, Clean Architecture and Redux, optimizing app
performance, reducing technical debt and delivering new features.

EDUCATION EXPERIENCE
Master’s Degree Devico — November 2025 - May 2026
Oles Honchar Dnipro Smart Cleanup
National University, Developed the Smart Cleanup app with a modern stack relying on SwiftUI and
Faculty of Applied Combine. Optimized media library scanning algorithms to quickly process large
galleries and detect duplicate or low-quality iles. Handled business and marketing
Mathematics, System
integrations, setting up StoreKit and Apphud for subscriptions, alongside Firebase
Analysis (2008-
and AppsFlyer for analytics and A/B testing.
2013)

SKILLS RubyGarage — August 2020 - January 2025
Swift, UIKit/SwiftUI, Mamopay - Manage business spending
Combine/RxSwift, SecuChat - Jemmic
CoreData/Realm, Unit Klekt - Marketplace for Sneakers, Streetwear
Contributed to diverse projects across intech, secure communications, and e-
Testing, MVVM, MVP,
commerce. Built features for business spend management and inancial tracking
Redux, VIPER, WebRTC,
for Mamopay. For SecuChat, a secure messaging platform, engineered a white-
Janus, AVFoundation,
label architecture using MVVM and RxSwift, and integrated Janus with WebRTC for
AppHud, Firebase,
real-time communication. Additionally, developed shopping and sales lows for
AppsFlyer, StoreKit Klekt (using SwiftUI/Combine), a sneaker and streetwear marketplace.

MonoBank — February 2019 - July 2020
MonoBank
At Monobank, focused on the core cashback low, building and maintaining
features for category selection, balance tracking, and partner o ers. Alongside
product development, I took an active role in reducing technical debt across the
entire application.

RubyGarage — October 2015 - October 2018
Developed an iOS application using Swift, focusing on complex UIKit development
and REST API integration. Built scalable content feeds, utilized AVFoundation for
media streaming, and integrated payment systems to support digital content
monetization.

Yalantis — July 2013 - September 2015
Supported projects dedicated to a birthday greeting calendar (MyDay), a sobriety
tracking media player (health research), and P ickles (Instagram alternative).
Supported initial transition from Objective-C to Swift.
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