Crystal Free
Engineering Manager at Wrapbook
Durham, North Carolina, United States
Summary
🤩
Rockstar🎓
Top SchoolCrystal Free is an engineering manager based in Durham, NC with nine years of experience building and operating payment-focused backend systems. She rose through hands-on engineering roles at Spreedly and Selfbook to lead teams at Wrapbook, combining deep Ruby expertise with practical API and payments integrations. An active contributor to the well-known Active Merchant project, she has implemented gateway-specific features like stored credentials, installments, and fraud fields while improving test coverage across many providers. Comfortable bridging customer-facing support and core engineering, she brings a writer’s clarity to documentation and cross-team communication. Her background in English and freelance writing informs a rare blend of technical precision and accessible communication that helps teams ship reliable payment infrastructure.
9 years of coding experience
19 years of employment as a software developer
English Language and Literature, General, English Language and Literature, General at University of LouisvilleCertificate, Ruby on Rails, Certificate, Ruby on Rails at Momentum
Github Skills (11)
testing10
payment-integration10
payment-gateway10
ruby10
api8
json8
apidoc8
restful-api7
api-design7
api-rest7
rest-api7
Programming languages (2)
Github contributions (5)
activemerchant/active_merchant
Feb 2020 - Sep 2021
Active Merchant is a simple payment abstraction library extracted from Shopify. The aim of the project is to feel natural to Ruby users and to abstract as many parts as possible away from the user to offer a consistent interface across all supported gateways.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:50 reviews, 30 commits, 49 PRs in 1 year 6 months
Contributions summary:Crystal primarily contributed to the `activemerchant/active_merchant` repository by implementing and refining payment gateway integrations. Their work involved modifying code related to various payment gateways like Eway, Vantiv/Litle, MercadoPago, Ingenico/Global Collect, Worldpay, Adyen, Decidir, HPS, and Payeezy, adding support for features like stored credentials, installments, and fraud detection fields. Furthermore, the user corrected code and improved test coverage across different payment gateways, including updating test card values and error messages.
ecommerceaimadyenpayment-processingpayment
cdmackeyfree/DIY
Jul 2017 - Sep 2017
Contributions:35 pushes, 2 branches, 1 comment in 1 month
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