Senior Mobile Engineer – Swift, Kotlin

Exerizon

. Design and build native apps in Swift (SwiftUI, UIKit) and/or Kotlin (Jetpack Compose), including new features, legacy modernisation and justified rewrites .

Posted 10/20/2026contractRemote • PolandSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive experience in native mobile development with a strong focus on Swift and Kotlin, including architecture ownership and integration of server-driven UI frameworks. Proficient in mobile security practices and fluent in both Polish and English for effective communication with diverse stakeholders.

Highest-signal resume keywords

Native Mobile DevelopmentSwiftUI and UIKitKotlin and Jetpack ComposeMobile Security in Regulated EnvironmentsCI/CD and Automated Testing

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

SwiftKotlinMVVM ArchitectureServer-Driven UIREST API IntegrationGraphQLXCTestJUnitDependency InjectionAI-Driven Development

Soft Skills

Clear CommunicationMentoring

Tools & Technologies

XcodeGradleOpenAPICrash Reporting ToolsAnalytics Tools

Industry Keywords

BankingInsuranceFintechHealthcareGDPR

Tech Stack

Tools & technologies

AndroidGradleGraphQLGRPCiOSJUnitKotlinSwift

About the role

Key responsibilities & impact

Design and build native apps in Swift (SwiftUI, UIKit) and/or Kotlin (Jetpack Compose), including new features, legacy modernisation and justified rewrites
Own platform architecture, including modularisation, MVVM / Clean Architecture / TCA, dependency injection, offline-first and data sync strategies
Build and evolve server-driven UI (SDUI), including component schemas, client-side rendering, schema versioning, backward compatibility and graceful fallbacks
Practise AI-driven development using coding agents and copilots for implementation, refactoring, test generation and code review
Integrate backend services through REST, GraphQL and gRPC, and secure apps end to end
Set and enforce engineering standards covering code review, unit/UI/snapshot testing, CI/CD, signing and app-store release management with phased rollouts
Build observability and product quality through crash reporting, analytics, feature flags, performance and startup-time budgets
Deliver accessibility and localisation for regulated clients
Work with client product owners, designers, backend engineers and QA; estimate, plan and demo work to stakeholders
Mentor mid-level engineers, raise Exerizon’s mobile practice standards, and support proposals and pre-sales demos

Requirements

What you’ll need

6+ years of native mobile development, including 3+ years in Swift (iOS) and/or Kotlin (Android); at least two apps shipped to production and maintained through multiple releases
Deep knowledge of your platform — iOS: SwiftUI and UIKit, Swift Concurrency or Combine, Xcode toolchain; Android: Jetpack Compose, Kotlin Coroutines and Flow, Android Jetpack, Gradle — with a working understanding of the other platform
Hands-on experience with mobile security in regulated environments: OAuth2 / OIDC and strong customer authentication flows, secure storage, certificate pinning, OWASP MASVS, and closing pen-test findings
Solid testing and CI/CD practice: XCTest or JUnit, UI and snapshot tests, automated pipelines, code signing, store submission and release management
Proven ability to own architecture decisions and refactor large legacy codebases safely, with measurable improvements in build time, crash rate or release cadence
Experience designing or integrating a server-driven UI framework: component schemas, a client renderer, schema versioning and A/B-tested layouts; understanding of where SDUI pays off and where it hurts (offline, performance, accessibility)
AI-driven development as part of your workflow: daily use of coding agents and copilots, understanding of their failure modes, and review of AI-generated code to the same standard as your own
Fluent API integration: REST and GraphQL, OpenAPI contracts, and collaboration with backend teams on API design
Experience delivering apps in banking, insurance, fintech or healthcare, including PII handling and regulatory constraints (PSD2 / SCA, GDPR)
Clear communication with non-engineers: explaining trade-offs to a product owner and estimating honestly
Full professional fluency in Polish and English

Benefits

Comp & perks

Real ownership of the apps you build and direct contact with client product owners — no ten-layer review pyramid
Competitive compensation on B2B contract
Annual training and certification budget
Remote work model with access to a central Warsaw office
A seat at the table in shaping a young firm: our mobile practice, engineering standards, hiring and culture