Senior Mobile Developer

IJssel Technologies is looking for another Senior Mobile Developer to own features in our native apps, from API integration to App Store release. Hybrid: two days in the office in The Hague, the rest from home.

Your responsibilities:

• Add push notifications through APNs and Firebase Cloud Messaging
• Maintain React Native or Flutter code where the app shares a codebase
• Implement offline storage and sync using Core Data, Room or SQLite
• Profile memory, battery and startup time with Instruments and Android Studio Profiler
• Integrate with REST and GraphQL APIs, including token refresh and retries
• Review mobile pull requests and share platform knowledge with the team
• Build features in Swift and SwiftUI for iOS, or Kotlin and Jetpack Compose for Android
• Support larger text sizes, VoiceOver and TalkBack

Minimum qualifications:

• 5+ years of professional iOS or Android development
• Git and code review experience
• Experience with async code (Swift Concurrency, Combine, Kotlin Coroutines, Flow)
• Comfort working with REST APIs and JSON

Why work with us:

Salary: €8,200 - €9,500 per month

• Hybrid working
• Bike plan
• 25 annual leave days
• Training budget
• Laptop and phone

The company:

Small accounting firms in South Holland use our engagement letter and e-signature tool, and most heard about us from a colleague. Everything runs on a single Rails app and one Postgres database, deployed on Heroku. Most engineers work remotely and come into the office one week a quarter for planning.

Please mention your notice period and expected salary.

Start: Flexible.

Demo job created on 11jobs for testing and demonstrations. It is not an actual opening at IJssel Technologies B.V..