Till Hellmund
Mobile Developer at Stripe
Old Toronto, Ontario, Canada
Summary
🤩
Rockstar🎓
Top SchoolTill Hellmund is a mobile developer with three years of hands-on experience building polished Android and iOS payment experiences at Stripe after honing mobile skills at Shopify. He contributes to the high-profile stripe-android and stripe-ios SDKs, shipping UI and payment-flow fixes—like preserving single-digit expiry months and improving payment method carousels—and adding screenshot tests to prevent regressions. Equally comfortable across platforms, Till focuses on UX details and edge-case reliability in wallet and Apple Pay integrations. His background includes internships and research roles at companies and institutions such as Google, Microsoft, Freeletics, and Carnegie Mellon, reflecting a blend of product-minded engineering and academic exposure. Based in Toronto, he brings a pragmatic attention to UI polish that reduces friction in real-world payments.
4 years of coding experience
4 years of employment as a software developer
Technical University of Munich
Github Skills (16)
uid10
payment-integration10
swift10
ios10
sdk10
mobile-development10
front-end-development10
ui-design10
android-development10
stripe-js10
testing9
xctest9
ui-testing9
kotlin9
uitest9
Programming languages (3)
Github contributions (5)
stripe/stripe-android
Aug 2022 - Jan 2023
Stripe Android SDK
Role in this project:
Mobile Developer (Android)
Mobile Developer (Android)Contributions:21 releases, 2471 reviews, 222 commits in 5 months
Contributions summary:Till primarily contributed to the Stripe Android SDK, focusing on UI and payment flow improvements. They addressed a bug related to preserving single-digit expiry months in the `PaymentSheet` by fixing the missing leading zeros issue. Additionally, the user made enhancements to the payment methods carousel, ensuring the display of payment methods was not cut off and improved the UI with the addition of screenshot tests. The user also made UI-related improvements in the Link wallet.
android-sdkstripestripe-sdk
stripe/stripe-ios
Mar 2023 - Jul 2026
Stripe iOS SDK
Role in this project:Mobile Developer (iOS)
Mobile Developer (iOS)Contributions:1 release, 437 reviews, 242 PRs in 3 years 4 months
Contributions summary:Till focused on the development and maintenance of the Stripe iOS SDK, specifically the `stripe-ios` repository. Their commits involved modifying Swift code, especially within the `StripePaymentSheet` and `StripeApplePay` directories. The changes included improvements to payment handling, and integration with Link, including adjustments to the UI. Several commits addressed bug fixes related to the flow and edge cases.
iosstripestripe-sdk
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