Senior iOS Engineer

Babbel

Senior iOS Engineer building distributable Swift packages and AI-first learning experiences for Babbel Labs. Integrating features into Babbel's language-learning app across product and engineering teams.

Posted 8/13/2026contractBerlin • 🇩🇪 GermanySeniorWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

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.

Highest-signal resume keywords

5+ Years Experience In iOS Application DevelopmentStrong Swift Proficiency Including Swift 6 ConcurrencyDeep SwiftUI ExperienceExperience With CI/CD DisciplineAbility To Make Architectural Decisions

ATS Keywords

Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills

IOS Application DevelopmentSwiftSwiftUIUnit TestingJSON API DesignConcurrencyState-Driven UITestable ArchitectureFeature PrototypingTechnical Documentation

Soft Skills

Clear CommunicationOpenness To FeedbackComfort With Ambiguity

Tools & Technologies

AI Coding ToolsCI/CD ToolsTuistRxSwiftPoint-Free Ecosystem

Industry Keywords

Education TechnologyConsumer Subscription ProductsHuman Interface GuidelinesCross-Functional CollaborationAgile Development

Tech Stack

Tools & technologies

iOSRxSwiftSwift

About the role

Key responsibilities & impact

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

What you’ll need

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

Benefits

Comp & perks

Diversity, equity, and inclusion commitment
Application accommodations for disabilities or special needs
Optional talent-pool consent for future contact for up to 24 months