Eric Muller
Client Engineering Lead at Square
Telluride, Colorado, United States
Summary
🤩
Rockstar🎓
Top SchoolEric Muller is an empathic, values-driven engineering leader with 12 years of experience scaling mobile and web platforms at Block/Cash App, where he grew engineering teams from 20 to over 200 while helping the product expand from P2P payments to a full financial services suite. He led Cash App through hypergrowth—contributing to revenue rising from $50M to $1.38B quarterly gross profit and monthly actives from 7M to 57M—while instituting org design, rituals, and quality practices that sustained three-nines crash-free sessions and broad test coverage. A hands-on builder earlier in his career, he shipped zero-to-one products like Square’s Reader SDK and contributed to Square’s Valet open-source library by improving nullable specifiers and documentation. He’s known for hiring and developing leaders, creating Block’s first technical apprenticeship for URMs, and stewarding durable culture under rapid scale. Based in Telluride, Colorado, he recently combined a family-focused sabbatical with advisory and consulting work, prototyping an iPad payments kiosk and exploring AI tooling and game development. Practical, strategic, and curious, he blends deep mobile engineering craft with organizational design and a knack for turning high-risk, high-visibility projects into repeatable platforms.
12 years of coding experience
8 years of employment as a software developer
B.A., Computer Science, B.A., Computer Science at Williams College
Github Skills (6)
objective-c10
ios10
keychain10
security9
macos9
crypto7
Programming languages (2)
Github contributions (5)
square/Valet
Jun 2015 - Apr 2018
Valet lets you securely store data in the iOS, tvOS, watchOS, or macOS Keychain without knowing a thing about how the Keychain works. It’s easy. We promise.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 release, 30 commits, 19 PRs in 2 years 10 months
Contributions summary:Eric primarily contributed to the Valet project by adding support for new nullable specifiers. These changes involved modifications to the header files (`.h`) and implementation files (`.m`) of the project. The user also added AppleDoc style comments and refactored existing code. These changes suggest a focus on improving the project's core functionality and maintainability.
keychaintvossecuritydata-storeface-id
EricMuller22/CodeCampSix
Jan 2016 - Aug 2018
Intro to iOS at Square's Code Camp VI
Contributions:12 commits, 4 PRs, 15 pushes in 2 years 7 months
campcydiacode-campswiftios
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