Senior iOS Engineer

Stellenbeschreibung:

• 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

Requirements

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

Core Competencies

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.