Senior iOS SDK Architect — Open-Source AdTech

Sigma Software; Kraków; On-site; PLN 230,000 - 320,000; Full time

Job summary

Sigma Software is seeking a Senior iOS Developer to join the AdTech project, focusing on native SDK development for production-grade mobile advertising SDKs used by publishers worldwide.

You will work with open-source iOS SDKs, CocoaPods distribution, and contribute to SDK architecture, release management, and integration support across iOS environments. Strong experience in Swift and Objective-C is required, with a proactive, ownership-driven mindset.

Qualifications

• At least 5 years of production iOS development experience.
• Strong commercial experience with Swift and Objective-C.
• Hands-on experience developing native iOS SDKs or reusable iOS libraries.
• Strong understanding of SDK architecture principles and mobile platform internals.
• Experience with CocoaPods and SDK packaging/distribution workflows.
• Proven experience with SDK versioning, release processes, and backward compatibility management.
• Practical experience with automated testing and device-based testing approaches.
• Understanding of production support processes and troubleshooting complex integration issues.
• Ability to work independently and take ownership of SDK quality and delivery.

Responsibilities

• Develop and maintain native iOS SDK functionality using Swift and Objective-C.
• Contribute to feature development for existing open-source SDK products.
• Improve SDK architecture, stability, scalability, and maintainability.
• Support SDK packaging, versioning, and distribution through CocoaPods.
• Ensure high release quality through automated testing and device-based validation.
• Investigate and resolve bugs, integration issues, and publisher-reported problems.
• Collaborate with Backend, Android, QA, and Product teams.
• Optimize SDK performance, reliability, and compatibility across supported iOS environments.
• Participate in release planning and quality assurance activities for SDK releases.
• Provide technical support for third-party integrations and troubleshooting activities.

Skills

English proficiency, upper-interm.

Release management awareness

Independent ownership

Tools

Swift

Objective-C

CocoaPods

iOS SDK

Automated Testing

Job description

Sigma Software is seeking a Senior iOS Developer to join the AdTech project, focusing on native SDK development for production-grade mobile advertising SDKs used by publishers worldwide.

You will work with open-source iOS SDKs, CocoaPods distribution, and contribute to SDK architecture, release management, and integration support across iOS environments. Strong experience in Swift and Objective-C is required, with a proactive, ownership-driven mindset.