Senior IOS Engineer

About us

Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer‑led products, and we're always looking for passionate individuals to join us. Learn more about our story at:

As a Senior iOS Engineer, you will play a key role in developing and maintaining our mobile app, ensuring high performance, scalability, and a seamless user experience. You will collaborate closely with the product manager and fellow developers to bring new features to life and continuously optimize our app. Your expertise in Swift and iOS development best practices will be instrumental in driving innovation and maintaining our position as a leader in the App Store.

• Develop and maintain a high-quality iOS application with a focus on performance, UI, and UX.
• Take ownership of development processes, ensuring clean, maintainable, and scalable code.
• Work with cross-functional teams to design, develop, and launch new features.
• Implement CI/CD pipelines and deployment best practices.
• Conduct code reviews and enforce coding standards.
• Profile and optimize app performance (memory, launch time, rendering, battery).
• Stay up to date with the latest iOS development trends and integrate relevant advancements.

• 5+ years of professional iOS development experience.
• Experience with B2C mobile apps built on subscription business models.
• Expert proficiency in Swift (protocol-oriented design, generics, value semantics, async/await, structured concurrency, actors).
• Strong command of Store Kit 2 and subscription lifecycle: purchase flows, receipt/transaction validation, entitlement management, offer codes, and server-to-server notifications (with Revenue Cat or a custom equivalent).
• Deep understanding of UIKit and SwiftUI, including interoperability, when to use each, and SwiftUI state management (@State, @Observable, @Environment).
• Solid grasp of architecture patterns (MVVM, Clean Architecture, Composable Architecture) and modularization for large codebases (SPM modules, feature isolation).
• Experience with Combine and/or Swift Concurrency for reactive and async data flows.
• Proficiency with CI/CD (Xcode Cloud, Fastlane, Bitrise, or Git Hub Actions), Gitflow, code signing/provisioning automation, and Test Flight distribution.
• Automated testing experience: XCTest, XCUITest, snapshot testing, and dependency injection for testability.
• Strong debugging and profiling skills with Instruments (Time Profiler, Allocations, Leaks, Hangs).
• Experience integrating AI-driven features and/or AI-assisted development workflows.
• Familiarity with analytics, crash reporting, and A/B testing / feature‑flag tooling

Ruby Labs operates within the CET (Central European Time) zone. Applicants from any country are welcome to apply for the position as long as they are located within approximately ± 4 hours of CET. This ensures optimal collaboration and communication during working hours.

Discover the perks of being part of our vibrant team! We offer:

• Remote Work Environment:
  Embrace the freedom to work from anywhere, anytime, promoting a healthy work‑life balance.
• Unlimited PTO:
  Enjoy unlimited paid time off to recharge and prioritize your well‑being, without counting days.
• Paid National Holidays:
  Celebrate and relax on national holidays with paid time off to unwind and recharge.
• Company‑provided Mac Book:
  Experience seamless productivity with top‑notch Apple Mac Books provided to all employees who need them.
• Flexible Independent Contractor Agreement:
  Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere. Read more about it here:

After submitting your application, we conduct a thorough review which typically takes 3 to 5 days, but may occasionally take longer due to the volume of applications received. If we see a potential fit, we proceed with the following steps:

• Recruiter…