Senior Mobile Engineer (Swift And/Or Kotlin)

October 19, 2026

Remote

Senior

Warsaw, Poland

Keep in mind

Another language required
Polish

Also worth knowing

English is required
B2B contract

Description

A strategy and technology consulting firm is hiring a Senior Mobile Engineer to build and modernise native iOS and Android apps for clients in banking, insurance and healthcare. The role covers new features, legacy codebase modernisation, server-driven UI, end-to-end security and engineering standards across the mobile practice. The engineer works directly with client product owners, designers and QA, and mentors mid-level engineers.

Responsibilities

Design and build native apps in Swift (SwiftUI, UIKit) and/or Kotlin (Jetpack Compose) — new features, modernisation of legacy codebases, and rewrites where they are justified
Own the architecture on your platform: modularisation, MVVM / Clean Architecture / TCA, dependency injection, offline-first and data sync strategies
Build and evolve server-driven UI (SDUI): design component schemas with backend teams (JSON or Protobuf), own the client-side rendering engine, handle schema versioning, backward compatibility and graceful fallbacks
Practise AI-driven development every day: coding agents and copilots for implementation, refactoring, test generation and code review, with the discipline to bring that practice to the whole team
Integrate with backend services (REST, GraphQL, gRPC) and secure the app end to end: OAuth2 / OIDC, biometrics, secure storage, certificate pinning, root and jailbreak detection, OWASP MASVS
Set and enforce engineering standards: code review, unit, UI and snapshot tests, CI/CD (Fastlane, GitHub Actions, Azure DevOps or Bitrise), signing, App Store and Google Play release management with phased rollouts
Build in observability and product quality: crash reporting, analytics, feature flags, performance and startup-time budgets
Deliver accessibility (WCAG 2.2 / EN 301 549) and localisation to the standard regulated clients require
Work directly with client product owners, designers, backend engineers and QA; estimate, plan and demo your work to stakeholders
Mentor mid-level engineers, raise the bar across the mobile practice, and support proposals and pre-sales demos

Requirements

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 with awareness of offline, performance and accessibility trade-offs
AI-driven development as part of your workflow: daily use of coding agents and copilots, understanding their failure modes, and reviewing AI-generated code to the same standard as your own
Fluent in API integration: REST and GraphQL, OpenAPI contracts, and working 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: you explain trade-offs to a product owner and estimate honestly
Full professional fluency in Polish and English
Mobile payments integration (Apple Pay, Google Pay, BLIK)
Accessibility auditing experience (VoiceOver, TalkBack)
Tech lead or team lead experience on a client-facing engagement
Building custom AI tooling: agents, MCP servers or codebase-specific skills and prompts

Conditions

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: mobile practice, engineering standards, hiring and culture

Similar jobs

Similar in meaning, not just matching keywords

This device does not meet the site requirements

What may not work

Senior Mobile Engineer (Swift And/Or Kotlin)

Job summary

Keep in mind

Also worth knowing

Description

Responsibilities

Requirements

Conditions

Similar jobs

Similar jobs

More on this topic

Senior Mobile Engineer (Swift And/Or Kotlin)

Job summaryAnalysis and summary of the descriptionSo-so [data-chart=chart-_R_qboahinpfiv6abqaqlb_] { --color-score: var(--warning); } .dark [data-chart=chart-_R_qboahinpfiv6abqaqlb_] { --color-score: var(--warning); } 65

Job summary

Keep in mind

Also worth knowing

Description

Responsibilities

Requirements

Conditions

Similar jobs

Similar jobs

More on this topic