Harry Marr
Member Of Technical Staff at Anthropic
Zurich, Zurich, Switzerland
Summary
🤩
Rockstar🎓
Top SchoolHarry Marr is a seasoned software engineer and leader with 16 years of experience building reliable, secure systems across startups and large platforms, currently working on safe AI at Anthropic. He co-founded and scaled Dependabot to acquisition and has since led engineering teams at GitHub focused on security products, plus served as CTO at GoCardless and tech lead at Monzo. Harry combines hands-on backend and DevOps expertise—contributing to widely used open-source projects like Homebrew and Django-SES—with product-led engineering that delivered payments, lending, and dependency-upgrade infrastructure at scale. He has a knack for improving developer workflows and operational robustness, from refining certificate storage in goproxy to adding Git partial-clone strategies in Homebrew. Based in Zurich, he pairs an entrepreneurial mindset with deep technical craftsmanship and a proven track record of shipping production systems and meaningful OSS improvements. An oft-overlooked strength: he moves seamlessly between business metrics and low-level implementation details, evidenced by both founding a profitable SaaS and committing focused fixes across diverse codebases.
17 years of coding experience
16 years of employment as a software developer
First Class BSc (Hons) Computing, First Class BSc (Hons) Computing at University of Leeds
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (50)
unit-testing10
git10
javascript10
boto10
date-manipulation10
python10
package-management10
aws-ses10
django10
testing10
rspec10
raycast10
typescript10
configuration-management10
proxy10
Programming languages (17)
Github contributions (5)
gocardless/statesman
Sep 2013 - Feb 2021
A statesmanlike state machine library.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:29 commits, 9 PRs, 14 pushes in 7 years 6 months
Contributions summary:Harry contributed to the core logic of the `statesman` library, focusing on state machine functionality. They implemented state machine logic, including defining states, transitions, and callbacks. The commits demonstrate the addition of features like guards and before/after transition hooks, enhancing the library's capabilities. They also added tests and corrected style issues.
state-machine
ruby-amqp/hutch
Jan 2013 - Dec 2013
A system for processing messages from RabbitMQ.
Role in this project:Back-end Developer
Back-end DeveloperContributions:123 commits, 2 comments in 11 months
Contributions summary:Harry primarily focused on improving the functionality and robustness of the `hutch` messaging system. They implemented basic logging support and enhanced message handling by modifying the `Message` class and incorporating logging features. The user also added support for configuration and command-line options, indicating a focus on user experience and operational aspects of the system. Further contributions included handling connection errors and consumer exceptions to improve reliability.
rabbitmq
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