Hannah Greer
Senior Software Engineer at Block
Waterloo, Ontario, Canada
Summary
🤩
Rockstar🎓
Top SchoolHannah Greer is a Senior Software Engineer with nine years of experience, currently serving as the Server Technical Lead for Cash App Pay and Afterpay Checkout at Cash App/Block, where she helped take Cash App Pay from 0 to 1 as a foundational engineer. She specializes in backend systems and payment infrastructure, shipping reliable production services in high-stakes fintech environments. Her background includes embedded C++ development for SATCOM systems and teaching discrete math and algorithms at Queen’s University, reflecting strong foundations in algorithms and systems design. Hannah combines hands-on engineering with mentorship and tooling experience, having built integration tooling and web-based learning software earlier in her career. Based in Waterloo, Ontario, she follows a learn-teach-share-repeat philosophy that drives continuous improvement and knowledge sharing across teams.
10 years of coding experience
Bachelor of Computing (B. Comp), Biomedical Computing, with Professional Internship, Bachelor of Computing (B. Comp), Biomedical Computing, with Professional Internship at Queen's University
Github Skills (7)
java9
android9
kotlin9
swift9
grpc8
protocol-buffers8
microservices4
Programming languages (1)
Github contributions (5)
HLGreer/CarShare
Mar 2017 - Apr 2017
Contributions:47 pushes, 1 branch in 10 days
HLGreer/3D-Fitting
Oct 2016 - Mar 2017
Contributions:4 pushes, 1 branch in 5 months
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