João Sampaio
Senior Backend Engineer at Close
Calgary, Alberta, Canada
Summary
🤩
Rockstar🎓
Top SchoolJoão Sampaio is a Senior Backend Engineer based in Cambridge, Ontario with 13 years of experience building and leading teams to deliver robust, scalable backend systems. He excels at turning complex business requirements into production-ready services, having led cross-functional teams and driven initiatives from observability (OpenTelemetry) to billing and telephony integrations at Close. Skilled in Python and distributed systems, he has practical open-source experience improving the tasktiger Redis-backed task queue—modernizing dependencies, adding concurrency controls, and shipping releases. João favors pragmatic improvements that reduce technical debt, boost developer productivity, and harden reliability, and he routinely serves as a first responder for production incidents. He brings startup grit from early-stage platform building and a disciplined approach to migrating legacy monoliths into microservice architectures.
13 years of coding experience
4 years of employment as a software developer
Bachelor of Engineering (B.E.), Computer Engineering, Bachelor of Engineering (B.E.), Computer Engineering at Universidade Federal de São Carlos
English, Portuguese, French
Stackoverflow
3,423reputation
301kreached
14answers
19questions
Github Skills (21)
webworker10
python10
redis10
back-end-development10
queuing10
service-worker10
queue10
testing9
oneclick8
clicking8
clickable8
onclick8
git7
declaration6
pointer6
Programming languages (9)
Github contributions (5)
closeio/tasktiger
Mar 2021 - Apr 2021
Python task queue using Redis
Role in this project:
Back-end Developer
Back-end DeveloperContributions:2 releases, 8 reviews, 8 commits in 21 days
Contributions summary:João primarily focused on improving the tasktiger Python task queue. Their contributions include dropping unnecessary dependencies and updating the project to support newer versions of dependencies like redis. They also added redis-py locks for improved concurrency control, and added a redis scan script, demonstrating a focus on enhancing the reliability and maintainability of the task queue system. Finally, the user released a new version of the project.
pythonredistask-queueworker
jpmelos/subcomm
Oct 2016 - Oct 2018
Simple API for a subcommand parser.
Contributions:18 PRs, 28 pushes, 19 branches in 2 years
parser
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