Senior iOS Engineer

November 6, 2026

Hybrid

Senior

Warsaw, Poland

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Mandatory office attendance
1 day per week
English is required
B2 level

Description

A large-scale international initiative is building a fintech platform from the ground up, giving engineers the chance to shape the architecture and build core fintech components at scale. A lean, highly effective engineering organization is being established in Poland with AI-native engineering at its core. The team is looking for an experienced iOS engineer to take end-to-end ownership of the native iOS platform, including architecture, quality, performance, and delivery of consumer and merchant-facing solutions.

Responsibilities

Own the architecture of a production FinTech iOS application, including layered architectural patterns, module boundaries, and dependency structure
Develop and maintain native iOS solutions using Swift, SwiftUI, and UIKit
Implement concurrency and reactive application flows using async/await, Actors, and Combine
Work with local persistence and security solutions such as Core Data, SwiftData, and Keychain Services
Contribute throughout the full development lifecycle, including PRD authorship, specification writing, testing, feature-flagged releases, and structured event emission
Build and maintain automated tests using XCTest and XCUITest
Profile and improve application performance using Instruments, including Time Profiler, Allocations, Leaks, and Core Animation
Maintain a zero-regression approach through production crash monitoring with tools such as Crashlytics
Develop and maintain CI/CD automation using Fastlane, Xcode Cloud, or equivalent solutions
Own integrations between native and web-based experiences, including WKWebView, universal links, deep linking, and handoff
Co-own the team backlog with Engineering and Product Managers, bringing iOS constraints and native solution proposals into requirement shaping
Collaborate with backend engineers on API contracts, authentication flows, and event schemas
Participate in production incident support and post-mortem activities when required

Requirements

At least 5 years of experience in native iOS engineering, including production applications published through the App Store
At least 4 years of experience working with Swift and SwiftUI and/or UIKit
At least 3 years of experience with iOS testing using XCTest and XCUITest
Strong knowledge of Swift 5.x, including Swift Concurrency, async/await, Actors, and Combine
Production-level experience with SwiftUI and UIKit, including an understanding of their rendering lifecycles
Knowledge of Clean Architecture, MVVM, and/or MVI, with a strong understanding of module and layer boundaries
Experience with Swift Package Manager and/or CocoaPods
Understanding of dependency inversion and designing code for testability
Experience with Core Data, SwiftData, and Keychain Services
Knowledge of URLSession, certificate pinning, and structured error handling
Experience profiling iOS applications with Instruments
Experience with Fastlane, Xcode Cloud, or equivalent CI/CD solutions, including automated signing
Ability to read and work with Objective-C in legacy systems and third-party SDK integrations
Experience integrating feature flags and structured events at the mobile layer
English at a minimum B2 level
A university degree in Information Technology, Computer Science, or a related field
At least 2 years of experience in FinTech or regulated mobile application development
Experience integrating Apple Pay or PassKit
Experience with modular iOS architecture at a multi-framework or monorepo scale
Knowledge of App Clips
Experience implementing WCAG or Apple accessibility standards in production applications
Familiarity with Swift macros and SwiftUI preview tooling at scale

Conditions

Hybrid working model with preferably 1 day per week in the Warsaw or Cracow office
B2B type of contract offered
Excellent working environment and flexible hours
Training opportunities and career development support
Diverse, international, and cross-functional environment alongside leading experts
Full-time employment