Senior iOS Engineer

• Participate in all product development phases: discovery, prototyping, solution proposal, implementation, review, testing, and deployment of learning experiences

• Shape product requirements with product partners, write technical specifications, agree interface contracts with backend and partner teams, slice the backlog, and build features

• Build prototypes to de-risk product ideas and feed learnings back into product development

• Design and evolve the public API of a distributable Swift package with deliberate versioning and breaking-change discipline

• Integrate the Swift package into Babbel's main iOS app, including integration points, A/B experiments, and rollout

• Collaborate with product managers, designers, subject matter experts, cross-platform engineers, and other cross-functional teams

• Maintain and improve the technology stack, build system, and AI-agent conventions

• Create technical documentation and share knowledge with colleagues and iOS engineers across Babbel

• 5+ years of experience building scalable iOS applications using Swift
• Active adoption of AI coding tools, including directing agents through feature work and critically reviewing their output
• Strong, up-to-date Swift, including Swift 6 strict concurrency, actors, Sendable, isolation, and structured concurrency
• Deep SwiftUI experience and knowledge of the Apple ecosystem and Human Interface Guidelines
• Experience with state-driven UI, unidirectional data flow architecture, and testable architecture
• Experience writing deterministic, exhaustive unit tests, snapshot tests, and maintaining CI/CD discipline
• Experience designing module boundaries, frameworks, or SDKs consumed by other teams, ideally distributable Swift packages
• Experience designing or consuming evolving JSON APIs and collaborating with contract-first backend teams
• Ability to make architectural decisions based on feature requirements and balance technical debt against delivery speed
• Comfort with ambiguity and fast iteration
• Clear, concise communication and openness to feedback
• Fluency in written and spoken English
• Nice to have:
  The Composable Architecture, Point-Free ecosystem, agentic coding setups, Tuist, Swift Testing, real-time client features, RxSwift/MVVM-C, and experience in language learning, education technology, or consumer subscription products

Demonstrates extensive experience in building scalable iOS applications using Swift, with a strong focus on Swift 6 concurrency, SwiftUI, and integration of distributable Swift packages. Capable of making architectural decisions, maintaining CI/CD discipline, and collaborating effectively with cross-functional teams.

• 5+ Years Experience In iOS Application Development
• Strong Swift Proficiency Including Swift 6 Concurrency
• Deep SwiftUI Experience
• Experience With CI/CD Discipline
• Ability To Make Architectural Decisions

• IOS Application Development
• Swift
• SwiftUI
• Unit Testing
• JSON API Design
• Concurrency
• State-Driven UI
• Testable Architecture
• Feature Prototyping
• Technical Documentation

• Clear Communication
• Openness To Feedback Comfort With Ambiguity

• Education Technology
• Consumer Subscription Products
• Human Interface Guidelines
• Cross-Functional Collaboration
• Agile Development

• AI Coding Tools
• CI/CD Tools
• Tuist
• Rx Swift
• Point-Free Ecosystem