Senior Mobile Engineer (Swift and/or Kotlin)

Description: Senior Mobile Engineer to build and modernize native mobile apps for clients in banking, insurance, and healthcare on iOS (Swift) and/or Android (Kotlin). Responsible for high-traffic apps with strict security and regulatory requirements. Requirements: 6+ years of native mobile development, including 3+ years in Swift and/or Kotlin; at least two apps shipped to production. Deep knowledge of iOS (SwiftUI, UIKit) or Android (Jetpack Compose) and hands-on experience with mobile security in regulated environments. Proven ability to own architecture decisions and refactor large legacy codebases safely. Experience with server-driven UI frameworks and fluent in API integration (REST, GraphQL). Full professional fluency in Polish and English. Benefits: Competitive compensation on B2B contract. Annual training and certification budget. Remote work model with access to a central Warsaw office. Opportunity to shape the mobile practice and engineering standards in a growing firm.