Oleksii Karas

Senior iOS Engineer / Team Lead / Tech Lead

10+ years crafting exceptional mobile experiences. Product-minded developer with expertise in Swift, SwiftUI, and modern iOS architectures. Building apps that users love.

+380 67 387 3894 Email LinkedIn Telegram WhatsApp

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About Me

Senior iOS Engineer with 10+ years in product-driven companies. I combine deep technical expertise with strong product thinking — understanding not just how to build features, but why they matter to users and business.

I excel at architecting scalable iOS applications while staying close to product strategy, metrics, and user impact. Experienced in leading technical decisions, mentoring teams, and collaborating across functions to ship features used by thousands.

Featured Projects

Recent projects I'm proud to have worked on

PayPilot

Team/Tech Lead • June 2025 – Present

Modern fintech wallet application with comprehensive financial management features. Built from scratch with focus on user experience and security.

Swift SwiftUI MVVM Combine SwiftData
View on App Store →
PayPilot Screenshot 1 PayPilot Screenshot 2 PayPilot Screenshot 3 PayPilot Screenshot 4

Wirex

Tech Lead (Jan 2024 – June 2025) • Senior iOS Engineer (Mar 2022 – June 2024)

Leading fintech platform providing cryptocurrency and traditional banking services. Developed and maintained comprehensive financial app with deep SDK integrations serving millions of users worldwide.

Swift MVVM Combine SwiftUI Realm Firebase Charts
View on App Store →
Wirex Screenshot 1 Wirex Screenshot 2 Wirex Screenshot 3 Wirex Screenshot 4

Goodwine

Senior iOS Engineer • January 2021 – March 2022

Ukraine's premium wine and spirits retailer app with extensive e-commerce features. Also worked on side projects: River Mall, Planeta Kino, BadBoy.

Swift VIPER RxSwift SnapKit Firebase CoreData Portmone SDK
View on App Store →
Goodwine Screenshot 1 Goodwine Screenshot 2 Goodwine Screenshot 3 Goodwine Screenshot 4

Professional Experience

PayPilot

Team/Tech Lead

📆 June 2025 – Present

Development and maintenance of a fintech app from scratch, with deep integration of financial SDKs and services.

Tech stack:

Swift SwiftUI MVVM Combine SwiftData

Wirex

Tech Lead

📆 January 2024 – June 2025

Senior iOS Engineer

📆 March 2022 – June 2024

Development and maintenance of a fintech app from scratch, with deep integration of financial SDKs and services.

Tech stack:

Swift MVVM Combine SwiftUI Realm Firebase Charts

IWIS / Goodwine

Senior iOS Engineer

📆 January 2021 – March 2022

Main project – Goodwine app. Side projects: River Mall, Planeta Kino, BadBoy.

Tech stack:

Swift VIPER RxSwift SnapKit Firebase CoreData

CS Ltd / Bank Lviv

Senior iOS Engineer

📆 July 2019 – December 2020

Development of a banking app with a focus on secure transactions and architecture refactoring.

Tech stack:

MVVM RxSwift SnapKit Firebase GoogleMaps

Space Whale

iOS Team Lead

📆 September 2018 – July 2019

Led a small iOS team; delivered NDA-protected apps (taxi and banking).

Tech stack:

Clean Architecture WebSocket Stripe CoreData Firebase

Distributed Lab

Middle iOS Engineer

📆 July 2018 – September 2018

Crypto wallet development with modern architecture and dependency injection.

NotyTeam

Junior iOS Engineer

📆 October 2016 – June 2018

Projects under NDA: restaurant app, messaging service.

Tech stack:

Objective-C CoreData AFNetworking WebSocket

Education & Languages

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Education

Kharkiv National University of Radioelectronics

Master's Degree: Computer-Integrated Systems

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Languages

English – Upper-Intermediate

Ukrainian / Russian – Fluent