Senior iOS SDK Engineer (m/f/x)

Senior iOS SDK Engineer (m/f/x)

Department: osapiens Hub

Employment Type: Full Time

Location: Madrid

Reporting To: Head of Hub Engineering

Description

About osapiens

At osapiens, more than 550 talented minds unite around one mission: enabling sustainable growth for businesses worldwide. Founded in 2018 and headquartered in Mannheim, Germany, we have built the AI-driven osapiens HUB - a multi-tenant platform hosting 26 enterprise-grade solutions designed for cross-company collaboration, automation, and compliance. With offices across Europe and the US, we are shaping the future of scalable and secure business technology.

Your Team

Join our Mobile Core Framework team to build and evolve the iOS native layer of our mobile client SDK. You'll design and implement Swift-based APIs that bridge native iOS capabilities to React Native, enabling app developers across the company to build powerful, performant mobile solutions.

Your Responsibilities

• Design, build, and maintain native iOS modules in Swift that expose platform capabilities (offline sync, background processing, device integrations) to React Native applications
• Own the React Native bridge layer, including Objective-C bridging headers and native module architecture
• Optimize SDK performance with focus on memory management, battery efficiency, and startup time
• Stay current with iOS platform evolution (new APIs, Swift language features, Xcode tooling) and integrate relevant capabilities into the SDK
• Build and maintain automated test suites and CI/CD pipelines in Azure DevOps
• Collaborate with app development teams to understand their needs and provide excellent developer experience
• Contribute to SDK documentation and versioning strategy

Your Experience

• Strong proficiency in Swift and the iOS SDK (UIKit/SwiftUI, Core Data, networking, background execution)
• Experience building frameworks, libraries, or SDKs consumed by other developers
• Familiarity with React Native native module development (or willingness to learn quickly)
• Solid understanding of memory management, threading, and performance optimization on iOS
• Experience with Xcode build systems, code signing, and distribution
• English is our working language; fluency in written and spoken English is required

Nice to Have

• Experience with Objective-C and Swift/ObjC interoperability
• Knowledge of TypeScript and React Native architecture
• Experience with offline-first mobile architectures and data synchronization
• Familiarity with CI/CD for mobile (Azure DevOps, Fastlane, or similar)
• Experience with Android/Java and/or Windows/Objective-C development

Join us for this and more...

• A purpose-driven mission tackling complex sustainability challenges while working alongside global industry pioneers at a fast-growing unicorn company
• Room for creativity through collaborative teamwork and an open communication culture
• Flexibility and team bonding with our hybrid work options
• Sustainable mobility options, promoting eco-friendly commuting solutions
• Fun team events and outings with our global teams
• An inspiring working environment in Madrid (and globally!)
• 25 days of vacations
• Health Care Insurance
• Other perks