Open to opportunities

Sergey Petrosyan

@sergeypetrosyan

Message

Senior iOS engineer specializing in Swift/SwiftUI architecture, performance, and full-cycle product delivery.

Armenia

Message

What I'm looking for

I’m looking to own iOS features end-to-end, build full-cycle products, and modernize codebases with Swift/SwiftUI. I want to deliver reliable, high-performance apps for real users and collaborate closely on scalable architecture.

I’m a Senior iOS Engineer with 6+ years of experience building and improving production mobile applications across fintech, social, and consumer products. I focus on Swift, SwiftUI, and UIKit—bringing performance, solid architecture, and modernization to mature codebases.

In my recent roles, I took ownership of feature delivery end-to-end, from implementation to production release, and improved key user flows like onboarding and push-triggered launches. I refactored legacy Objective-C components to Swift/SwiftUI, strengthened stability by addressing crash-prone async and network-dependent scenarios, and contributed to codebase modernization for better iOS compatibility.

I also enjoy tackling “from-scratch” builds and complex multi-entity, real-time flows, using patterns like MVVM (and VIPER where needed) to keep features scalable. I’m currently building PixPuzz as a full-cycle product owner, covering development from app to backend, analytics, and monetization, while keeping the UX smooth and performance-optimized.

Experience

Work history, roles, and key accomplishments

iOS Developer

Baklava Technologies

Feb 2024 - Aug 2025 (1 year 6 months)

Owned feature delivery from implementation through production releases, improving onboarding, push-triggered launches, and in-app sharing to reduce friction. Refactored legacy Objective-C components to Swift/SwiftUI and improved stability by fixing crash-prone async and network-dependent scenarios.

Objective C Swift UIKit SwiftUI MVVM Firebase AWS Performance Optimization Crash Fixing

iOS Developer

Oysteq

Feb 2023 - Feb 2024 (1 year)

Built an all-in-one event planning app from scratch, implementing core features including invitations, guest management, chat, and media storage. Designed complex multi-entity and real-time event interactions using MVVM to ensure consistency and scalability.

Swift MVVM Firebase OneSignal Google Maps SDK Google Places API Multi Entity Flows Push Notifications App Architecture

iOS Developer

BusinessSolutionsLab

Mar 2022 - Mar 2023 (1 year)

Delivered multiple iOS applications across e-commerce, fitness/social, and tech domains while balancing parallel workstreams. Built modular VIPER-based features, implemented reactive state-heavy screens with RxSwift/RxCocoa, and integrated third-party SDKs for networking, maps, media, and analytics.

Swift VIPER RxSwift RxCocoa Realm Alamofire Reactive Programming SDK Integration

iOS Developer

System Technologies

Feb 2021 - Apr 2022 (1 year 2 months)

Developed and improved banking applications with a focus on reliability, security, and consistency of user-facing financial flows. Redesigned core screens to improve usability and added unit testing practices to reduce regression risk and improve release confidence.

Objective C Swift UIKit REST APIs Unit Testing API Integration Code Signing Error Handling

iOS Developer

FOX3

Feb 2020 - Nov 2020 (9 months)

Contributed to mobile applications across secure messaging, VPN, and med-tech domains by addressing production edge cases to improve stability and user experience. Built a med-tech app from scratch with local data persistence, dynamic visualization with animated charts, custom UIKit components, onboarding flows, and in-app purchases.

Swift UIKit Core Animation Realm REST APIs Dynamic Charts In App Purchases UI Components