Senior iOS Engineer
AffinityBarcelona, Spain
Full Time
Posted February 26, 2026
Not Specified
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Job Description
A mobile iOS developer role focused on building and maintaining a SwiftUI-based application for Affinity's CRM platform, with opportunities to contribute to cross-platform development and influence app architecture and features.
Key Responsibilities
- Own and evolve the iOS codebase for the SwiftUI application
- Lead architecture decisions, maintain code quality, and ensure technical excellence
- Develop core platform functionality and build new features
- Optimize app performance, memory management, and ensure App Store standards
- Contribute to shared infrastructure, including Kotlin Multiplatform modules
- Collaborate with cross-functional teams including product, design, and backend
- Support cross-platform development efforts, including Android development with Jetpack Compose
Requirements
- 5 years of iOS development experience, with deep expertise in modern iOS development
- Expert-level SwiftUI skills with a strong understanding of SwiftUI architecture patterns, state management, MVVM, dependency injection, and compositional design
- Proficiency in Swift 6, including modern Swift features such as async/await
- A proven track record of shipping high-quality apps to the App Store
- Strong understanding of REST APIs, JSON serialization, authentication, and error handling
- Experience troubleshooting across network and application layers, diagnosing and improving performance issues systematically
- Excellent communication skills, capable of explaining technical decisions clearly and contributing to technical strategy and roadmaps
- Demonstrated strong ownership instincts, attention to detail, and the ability to iterate based on validation
- Interest in expanding beyond iOS to become a T-shaped mobile engineer
- Experience writing unit tests and UI tests for mobile applications
- Experience building B2B or CRM applications
- Ability to collaborate cross-functionally with product, design, and backend teams
- Physical ability and willingness to work in-office in Barcelona, Spain 2 days per week
Benefits & Perks
Comprehensive health insurance for employee and family
Annual education budget and learning development program
Monthly wellness membership and equipment budget
Opportunity to work in a small, high-impact team with significant ownership
Hybrid work model with in-office presence 2 days per week
Ready to Apply?
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