Senior iOS Engineer - Fintech Platform (m/f/n)

Location: Warsaw/Cracow, pl

Company Description

InPost Pay is building its own fintech platform from the ground up. It’s a large-scale, international initiative where engineers will have the opportunity to shape the architecture, build core fintech components, and create solutions designed to operate at InPost’s scale.

We’re building a lean, highly effective engineering organization in Poland, with AI-native engineering at its core. We’re looking for strong engineers who are comfortable with agentic engineering, from experienced professionals building complex systems and engineering tooling to a new generation of engineers who have embraced AI-driven development from the start of their careers.

→ Hybrid working model: preferably 1 day per week in the Warsaw or Cracow office.

Job Description

We are looking for an experienced iOS Engineer to join our FinTech Platform team. You will take end-to-end ownership of the native iOS platform, including architecture, quality, performance, and the delivery of consumer and merchant-facing solutions.

You will help maintain a zero-regression production environment and contribute to both the technical health of the platform and the business outcomes of the products you build

What you will do

• 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.

Qualifications

• 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.

Nice to have

• 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.

Additional Information

• Opportunity to work in a diverse, international, and cross-functional environment, along with leading experts. 
• You work and learn from a senior leader and their leadership team, expanding your experience and exposure in the e-commerce and logistics industries. 
•  InPost is a growing company that offers its people an increasing number of opportunities in several locations in Europe. 
• Fulfilling careers with a range of benefits for people and investing in providing training opportunities for their development. 
• You will feel a part of the InPost community that makes an impact on sustainability, convenient deliveries, and the circular economy every day. 
• Excellent working environment and flexible hours
• We offer B2B type of contract