Frederic Barthelemy
Co-Founder, Engineering at Cooks Atlas
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolFrederic Barthelemy is a seasoned engineering leader and founder with 16 years of experience building mobile-first products, distributed backends, and high-performing engineering teams from startup to scale. As Co-Founder and Head of Engineering at Cooks Atlas (launching Summer 2025) he blends deep mobile and API expertise with product-led design to make communal food experiences feel personal and delightful. Previously a Staff Engineer at TaskRabbit and senior roles at Fitbit and FitStar, he led major platform rewrites (including native-to-React Native migrations), introduced TypeScript and GraphQL across orgs, and shipped features that measurably improved stability and revenue. An active open-source contributor, his work spans widely used repos—improving tooling, CI integrations, and React Native libraries like react-native-parsed-text and tipsi-stripe—which reflects a knack for practical, durable fixes across the stack. Known for turning cross-functional constraints into clear technical roadmaps, he’s equally comfortable mentoring teams, vetting vendors, and shipping polished user-focused systems.
16 years of coding experience
18 years of employment as a software developer
BSE-CSE Computer Science Engineering, BSE-CSE Computer Science Engineering at University of MichiganBSE-CSE Computer Science Engineering, BSE-CSE Computer Science Engineering at University of Michigan - College of Engineering
Spanish, English, French
Github Skills (32)
github-ci10
javascript10
danger10
ios10
react-native10
continuous-integration10
jes10
typescript10
regex10
wpgraphql10
cicd10
apollo-client10
uicollectionview10
parsing10
jestjs10
Programming languages (24)
Github contributions (5)
taskrabbit/react-native-parsed-text
Nov 2018 - Jun 2020
Parse text and make them into multiple React Native Text elements
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:2 releases, 42 commits, 15 PRs in 1 year 7 months
Contributions summary:Frederic primarily contributed to the `react-native-parsed-text` repository by enhancing the parsing and text rendering capabilities of the library. They upgraded dependencies like Babel and React Native, switched the testing framework to Jest, and improved URL parsing, including handling various URL formats and edge cases. Additionally, the user refined the existing code to prevent unexpected punctuation and fixed an issue with long TLDs.
reactreact-nativeelementsparsingparse
tipsi/tipsi-stripe
Jul 2019 - Mar 2020
React Native Stripe binding for iOS/Android platforms
Role in this project:Mobile Developer (iOS)
Mobile Developer (iOS)Contributions:2 reviews, 102 commits, 62 PRs in 8 months
Contributions summary:Frederic primarily contributed to the iOS implementation of the React Native Stripe binding library. Their work focused on integrating and configuring the Stripe iOS SDK, specifically implementing the `STPAppInfo` configuration and adapting features like card form and Apple Pay for React Native use. They also refactored the `paymentRequestWithCardForm` method to align with Stripe's API changes. Furthermore, they worked to surface and test the supported Apple Pay networks.
stripereactreact-nativeios-androidplatforms
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