Senior iOS SDK Engineer - Open-Source, Release-Ready

Sigma Software; Kraków; On-site; PLN 180,000 - 260,000; Full time

Job summary

Sigma Software is seeking a Senior iOS Developer to advance native SDKs for our Ad Tech platform. You will work on production-grade iOS SDKs distributed via CocoaPods, focusing on architecture, stability, and integration with third-party apps.

You will contribute to feature development, SDK packaging, and release planning, while ensuring backward compatibility across iOS environments and providing robust publisher support. Strong collaboration with Backend and QA teams is essential.

Qualifications

• 5+ years of production iOS development experience.
• Strong Swift and Objective-C knowledge.
• Experience building native iOS SDKs or libraries.
• Understanding of SDK architecture and release workflows.

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.
• Collaborate with Backend, Android, QA, and Product teams.

Skills

Swift

Objective-C

English

Independent work

Ownership

Tools

CocoaPods

SDK packaging

Open-source SDKs

Version control

Xcode

Job description

Sigma Software is seeking a Senior iOS Developer to advance native SDKs for our Ad Tech platform. You will work on production-grade iOS SDKs distributed via CocoaPods, focusing on architecture, stability, and integration with third-party apps.

You will contribute to feature development, SDK packaging, and release planning, while ensuring backward compatibility across iOS environments and providing robust publisher support. Strong collaboration with Backend and QA teams is essential.