Guillermo Fisher
Principal CEO And Fractional CTO at Cupalo
Chesapeake, Virginia, United States
Summary
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Senior🎓
Top SchoolGuillermo Fisher is a seasoned technology leader and fractional CTO with over two decades of experience helping mission-driven organizations scale secure, data-driven platforms from cloud-native infrastructure to AI/ML deployments. Based in Chesapeake, VA, he has repeatedly improved engineering velocity and reliability—driving a 45% YoY velocity increase and a 67% reduction in bugs at Untapped while replatforming legacy AWS to Kubernetes and multi-account architectures. He blends hands-on engineering (contributions to a well-known PHP GitHub API client adding commit and contributor analytics) with executive strategy, having led SOC 2 security programs, data governance, and Cloud FinOps initiatives. As an engineering mentor and career coach, he builds teams, processes, and developer experience practices that measurably boost productivity. Guillermo’s background in theoretical mathematics and long history of cross-functional leadership give him a pragmatic, metrics-driven approach to technical decision making. Outside of work he identifies as an AWS Data Hero, writer, husband and father—bringing a human-centered perspective to technical transformation.
12 years of coding experience
17 years of employment as a software developer
Candidate for Bachelor of Science Theoretical Mathematics, Candidate for Bachelor of Science Theoretical Mathematics at Massachusetts Institute of TechnologyNew York State Regents Diploma Mechanical Engineering, New York State Regents Diploma Mechanical Engineering at Brooklyn Technical High School
English, Spanish
Stackoverflow
610reputation
59kreached
7answers
0questions
http-post
top-5%
json
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post
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Github Skills (16)
php10
github-api10
api-design10
testing10
post9
object-oriented-programming9
http-post9
json9
slim6
htaccess6
asp-net6
phpdoc6
curl6
apache6
conditional-statements6
Programming languages (5)
Github contributions (5)
KnpLabs/php-github-api
Feb 2014 - Jun 2014
A simple PHP GitHub API client, Object Oriented, tested and documented.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:11 commits, 4 PRs, 19 comments in 4 months
Contributions summary:Guillermo primarily contributed to the back-end functionality of the PHP GitHub API client. They added a new method to retrieve commit activity and another to retrieve contributor statistics, enhancing the API's capabilities. They also fixed spacing and added tests for the new methods, ensuring code quality. Furthermore, the user implemented functionality to list all GitHub users, expanding the API's scope.
api-clientapidocumentedphphateoas
guillermoandrae/php-repository
May 2018 - Dec 2021
Contributions:14 releases, 34 pushes, 3 branches in 3 years 7 months
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