Senior iOS/Android Developer l EU Institutions Project l Hybrid

SEIDOR; Strasbourg; Hybrid; EUR 70,000 - 95,000; Full time

Job summary

SEIDOR is seeking a Senior iOS/Android Developer to join our hybrid team in Strasbourg. The role focuses on developing and maintaining mobile libraries, integrating native C/C++ code, and delivering reusable SDKs and integration interfaces.

You will design wrappers, implement packaging and distribution mechanisms, and write automated tests while collaborating with architects and domain experts to ensure robust, scalable mobile solutions.

Qualifications

• 8+ years of professional software development experience.
• Strong Android or iOS development with native library integration.
• Proficiency in Kotlin/Java for Android or Swift/Objective-C for iOS.
• Experience building reusable libraries, SDKs, APIs, and integration components.
• Experience implementing data parsers, validation logic, and robust error handling.
• Knowledge of memory ownership, concurrency, and language interoperability.
• Experience with automated testing, dependency management, and release processes.
• Strong analytical, problem-solving, and collaboration skills.

Responsibilities

• Develop and maintain Android and iOS libraries and apps.
• Design wrappers and APIs to integrate native C/C++ libraries.
• Develop reusable libraries, SDKs, and integration interfaces.
• Implement platform-specific packaging, distribution, and diagnostics.
• Develop data parsers, validation rules, and diagnostic reporting.
• Translate specifications into robust, maintainable software solutions.
• Design and execute automated tests for functionality and integration.
• Investigate defects, troubleshoot issues, and optimise performance.
• Collaborate with software architects, C++ engineers, and domain specialists.
• Participate in code reviews and maintain integration documentation.

Skills

Android development

iOS development

Kotlin

Swift

C/C++ interoperability

Automated testing

GitHub workflows

CI/CD

JNI

XCFrameworks

Android Studio

Xcode

Gradle

Jira

Confluence

Tools

Android Studio

Xcode

Gradle

JNI

XCFrameworks

GitHub

Job description

SEIDOR helps organizations transform and stay competitive through technology and innovation, always putting people first. With over 8,000 professionals in 45 countries, we are a diverse and inclusive global team committed to talent, equal opportunities, and sustainable growth. Will you join us in humanizing technology?

We are looking for an experienced Senior iOS/Android Developer to join our team in a hybrid setting (Remote + 20 onsite days per year).

WHAT WILL YOU DO IN YOUR DAY-TO-DAY?

Develop and maintain software libraries, integration layers, and data validation applications for Android and iOS platforms.

Design and implement wrappers and APIs to integrate native C/C++ libraries into mobile and enterprise applications.

Develop reusable software components, SDKs, and integration interfaces.

Implement platform-specific integration, packaging, and distribution mechanisms.

Develop data parsers, validation rules, and diagnostic reporting for structured and binary data formats.

Translate technical specifications into robust, maintainable, and reusable software solutions.

Design and execute automated tests covering functionality, compatibility, and integration.

Investigate defects, troubleshoot technical issues, and optimise application performance.

Collaborate with software architects, C++ engineers, and domain specialists.

Participate in code reviews and maintain technical documentation and integration examples.

Requirements

WHAT DO WE EXPECT FROM YOU?

At least 8 years of professional software development experience, ideally 10 years or more.

Strong development experience in Android or iOS, including integration of native C/C++ libraries.

Proficiency in Kotlin/Java for Android or Swift/Objective-C for iOS.

Proven experience developing reusable libraries, SDKs, APIs, and integration components.

Experience implementing data parsers, validation logic, and robust error handling.

Good understanding of memory ownership, concurrency, and interoperability across programming languages.

Experience with automated testing, dependency management, and software release processes.

Strong analytical, problem-solving, and collaboration skills.

Specific Technical Requirements

Android Studio, Android SDK/NDK, and Gradle, or Xcode and Apple library packaging tools.

Java and associated build tools for enterprise application development.

Git-based collaboration workflows, preferably GitHub.

Debugging, profiling, and automated testing tools.

Continuous integration pipelines and artifact repositories.

Jira and Confluence, or equivalent collaboration tools.

Nice to Have

Practical development experience across both Android and iOS platforms.

Experience with Java Native Interface (JNI), Objective-C++, or equivalent native interoperability mechanisms.

Knowledge of cross-platform builds and SDK distribution, including Android libraries and Apple XCFrameworks.

Experience with binary data formats and extensible validation engines.

Previous involvement in biometric applications or image processing software.

Knowledge of secure coding practices and handling malformed or untrusted inputs.

Will you join us in humanizing technology?