Senior iOS SDK Engineer

RevenueCat removes the headaches of building and scaling in‑app subscriptions. Since graduating from YC’s S18 batch we’ve grown into the default monetization platform for mobile: we’re in >40 % of newly shipped subscription apps, we process $8 B+ in annual purchase volume, and we help everyone from a solo dev in Brazil to the OpenAI mobile team understand and grow their revenue.

We’re a remote‑first crew of 100+, guided by values we actually practice: Customer Obsession, Always Be Shipping, Own It, and Balance. If you want your work to touch hundreds of millions of end‑users (and help the developers behind them get paid), you’ll fit right in.

We’re looking for a Senior SDK engineer to work on our open source SDKs and automations.
Our CoreSDK team focuses on making our SDKs easy to use, well-tested and robust, and ensures they can be updated often. You’ll contribute to our iOS, Android, Flutter, React-Native, Cordova/Capacitor/Ionic and Unity SDKs, with code written in Swift, Objective-C, Kotlin, Java, Dart, Typescript, C# and Ruby.
You’ll learn how each of the platforms work and work with modern technologies like SwiftUI, Swift Concurrency, Android Coroutines, Sound null safety in Dart, and CI/CD pipelines, with a strong emphasis in API design, testing and robustness.
If you’re curious to learn more about the kind of work our team does, here are a few blog posts describing some of our projects:

• Release Trains

• How we test our SDKs at RevenueCat

• Migrating from StoreKit 1 to StoreKit 2

• How our Hybrid SDKs work

This role will primarily focus on our iOS (Apple platforms) SDK but also requires contributions to our Android SDK and hybrid SDKs. Experience in these other platforms is not a requirement but the desire and excitement to work on them is.

• You have 5+ years of experience in software, and have shipped mobile apps to App Store / Google Play.

• You are very experienced in iOS, Swift, and SwiftUI.

• You are not afraid of Android or hybrid platforms.

• You love making products for developers.

• You love shipping good products.

• You have deep empathy for customers.

• You know how to ship high quality code using good testing practices in iterative cycles.

• You collaborate well with others and can communicate effectively in a fully-remote culture.

• You are proactive. When you see something broken, you jump on it to fix it or suggest improvements.

• You move fast, test, and iterate quickly.

• You ask questions when you're stuck on something.

• You are excited to be part of a growing team.

• You have experience in Kotlin and Jetpack Compose.

• You have experience building SDKs.

• You have experience in server driven user interfaces.

• You have shipped your own app to the App Store or Google Play with paywalls.

• You have experience in Python or other backend development.

• Learn about our customers, our SDK, the in-app subscription ecosystem, the problems RevenueCat helps solve, and how our SDKs fit into that.

• Open your first pull request and deploy changes to be used by 32,000+ apps.

• Onboard into our codebase by working on your very first project and shipping it 😺

• Learn how we maintain as much transparency as possible with our work in GitHub.

• Begin reviewing code and add to our engineering culture.

• Be able to scope and work on projects self-sufficiently.

• Participate in code reviews, and contribute in other ways (testing, visibility, etc.) to improve reliability and quality of the codebase.

• Understand every product owned by your team.

• Understand and improve many of the codebases that the team works with.

• Be the most knowledgeable person on several key features.

• Have your own initiatives for improving the code base and our infrastructure.

• Contribute to the team roadmap and technical direction.

• Have shipped a major product or feature.

• Know more about mobile subscriptions than anyone ever should.

• Use your knowledge to contribute ideas to RevenueCat’s suite of solutions.

• Be able to spec, architect and build any feature we might want to build.

• Have experience in all areas of technology stack related to SDKs and be the primary expert/owner of at least one area.

• Help mentor and onboard new engineers, shaping the RevenueCat engineering culture as we continue to expand the team.

• Help prioritize the roadmap to provide maximum value to developers, while pushing the team and technology forward.

• Competitive equity in a fast-growing, Series C startup backed by top-tier investors, including Y Combinator

• 10-year window to exercise vested equity options

• Fully remote and flexible work environment

• 4-5 weeks of suggested time off annually for mental, physical, and emotional recharge

• $2,000 USD for workspace setup and $1,000 USD annual stipend for continuous learning

Curious about the interview process? Discover more in our blog post about how we hire and learn tips to help you succeed.