We are building a new, dedicated product team for a large-scale banking application and looking for a Senior iOS Engineer to join from the ground up. This is a greenfield team setup — you will have direct influence on how the team works, what standards it follows, and how the product evolves. The application is built entirely on Kotlin Multiplatform (KMP) with Compose Multiplatform for shared UI across Android and iOS. Your deep understanding of the iOS platform will be critical for platform-specific integrations, bridging native APIs, ensuring smooth App Store distribution, and optimizing the Compose Multiplatform experience on iOS. 

We need people who work with agility — who thrive in short iterations, understand what they are building and why, and take ownership of delivering high-quality solutions end-to-end. Equally important is your ability to think in product terms: understanding user needs, challenging requirements, and proposing better approaches. Fluent use of Agentic Engineering tools (Claude Code, Cursor) is a core expectation, not a bonus. 

Your Responsibilities:

🔹Contribute to shared UI development using Compose Multiplatform, ensuring excellent rendering and performance on iOS 

🔹Own iOS-specific platform integrations: Keychain, biometrics (Face ID/Touch ID), push notifications, deep linking, app lifecycle, permissions 

🔹Bridge native iOS APIs (Swift/Objective-C) with the KMP shared layer using expect/actual and native interop 

🔹Build, extend, and maintain Design System components in Compose Multiplatform — ensure iOS platform fidelity, consistency, and reusability across the product 

🔹Participate actively in product discovery and sprint ceremonies — understand the why behind every feature, challenge assumptions, and propose better solutions 

🔹Deliver working software in short iterations with high quality — own your work from concept through production 

🔹Collaborate on architecture decisions and help establish best practices for KMP/CMP on the iOS side 

🔹Write clean, testable, and well-documented code following Clean Architecture principles 

🔹Conduct thorough code reviews focused on quality, consistency, and shared standards 

🔹Manage iOS-specific build, signing, and App Store submission processes 

🔹Collaborate closely with Android engineers, backend teams, QA, product managers, and designers in a cross-functional product team 

🔹Continuously improve development processes, tools, and CI/CD pipelines 

🔹Use Agentic Engineering tools (Claude Code, Cursor, GitHub Copilot) daily for code generation, refactoring, testing, and exploration 

Who Are We Looking For?

✅Minimum 5 years of professional experience in native iOS development 

✅Expert-level proficiency in Swift; working knowledge of Objective-C for interop scenarios 

✅Strong understanding of iOS platform internals: UIKit/SwiftUI lifecycle, Keychain, App Transport Security, entitlements, provisioning 

✅Hands-on experience with Kotlin Multiplatform (KMP) integration in iOS projects 

✅Working knowledge of Kotlin and Compose Multiplatform sufficient for daily contribution to shared code 

✅Deep understanding of architecture patterns: MVVM, MVI, Clean Architecture 

✅Experience working with and contributing to a Design System — building reusable UI components, maintaining component libraries, ensuring design-to-code fidelity across platforms 

✅Proven ability to work in agile, cross-functional product teams — short iterations, continuous delivery, close collaboration with product and design 

✅Experience with Xcode build system, CocoaPods/SPM integration with KMP frameworks 

✅Solid experience with testing frameworks (XCTest, Quick/Nimble, and KMP shared test suites) 

✅Proficiency with CI/CD tools and processes for mobile applications 

✅Proficient, daily use of AI-assisted development tools (Claude Code, Cursor, GitHub Copilot) — effective prompting, critical verification of outputs, integration into engineering workflows 

✅Product thinking — ability to understand business context, empathize with users, and communicate trade-offs to non-technical stakeholders 

✅Fluency in Polish and English (written and spoken) 

✅Availability for occasional on-site sessions in Warsaw (workshops, kickoffs, planning events) 

✅Ownership mindset — responsible for outcomes, not just tasks, with a proactive, can-do approach to problem-solving

✅Clear communicator and collaborative team player, comfortable working in a new and evolving team

✅Growth mindset with continuous learning and openness to experimenting with AI tools and sharing best practices

Nice to have:

✅Experience in fintech or banking sector 

✅Knowledge of security best practices for financial applications 

✅Experience with iOS platform specifics (helpful for shared UI debugging) 

✅Experience with feature flags and A/B testing frameworks 

✅Familiarity with Ktor (client and/or server-side) 

✅Contributions to open-source projects 

✅Experience working at scale (large user base, complex systems) 

✅Experience joining or building a team from scratch 

What Can You Expect from Us?

🌍Fixed-term contract – with the possibility of extension

🌍Career & Development – Trainings, workshops, and collaboration with top industry experts

🌍Exciting Challenges – Work with leading financial market brands and award-winning projects

🌍Supportive Team – Knowledge sharing during Wednesday Wisdom meetings & tech breakfasts

🌍Autonomy & Innovation – We welcome your ideas and initiatives

🌍Stable Collaboration – Clear, transparent B2B agreements in line with current regulations, ensuring mutual trust and predictability

🌍Work-Life Balance – Flexible working hours and a culture that values personal time

🌍Hybrid or Remote Work Model – It’s up to you

🌍Perks u0026amp; Benefits – Private medical care, Multisport card, English lessons, training budget, and more

🌍Trust & Transparency – Open communication and a culture of feedback

Join us as a Senior iOS Engineer (Kotlin Multiplatform) and help shape cutting-edge cross-platform solutions while working in a collaborative, growth-focused team!