Willian Paixao
Senior Software Engineer at 0+X
Stockholm, Sweden
Summary
👤
Senior🎓
Top SchoolWillian Paixao is a Senior Software Engineer based in Stockholm with 12 years of experience building resilient, cloud-native infrastructure and developer platforms for startups and enterprises. He has a strong SRE/DevOps pedigree — leading zero-downtime upgrades for a 100k+ node Ethereum network, managing live Olympic-scale broadcasts, and designing CI/CD and onboarding processes for large banks and fintechs. A serial operator-founder, he co-founded open-source platform MOSS and led 0+X, delivering infrastructure and advisory work for customers like Klarna and Spotify. Willian mixes low-level systems know-how (kernel modules, embedded work) with modern tooling (Kubernetes, Terraform, Ansible) and a knack for improving developer experience via clean APIs and automation. He also contributes to notable open-source projects such as Zipline, focusing on documentation and developer workflows to make complex tooling more accessible. Expect an engineer who asks “what happens when this needs to handle 10x more” and then builds the systems to prove it.
12 years of coding experience
12 years of employment as a software developer
Bachelor of Engineering (B.Eng.) Computer Engineering, Bachelor of Engineering (B.Eng.) Computer Engineering at Universidade Federal do Pará
Swedish, Italian, English, German, Portuguese
Stackoverflow
148reputation
2kreached
3answers
1question
Github Skills (16)
markdown10
rmarkdown10
markdown-it10
algorithmic-trading10
documentation10
python9
git8
version-control8
pre-commit-hook7
windows6
android-studio6
docker6
linux6
pysftp6
amazon-web-services6
Programming languages (23)
Github contributions (5)
quantopian/zipline
Aug 2018 - Apr 2020
Zipline, a Pythonic Algorithmic Trading Library
Role in this project:
Technical Writer
Technical WriterContributions:8 commits, 9 PRs, 29 comments in 1 year 7 months
Contributions summary:Willian primarily contributed to the documentation of the Zipline library. Their work includes adding installation instructions, updating existing documentation with current information, and introducing pre-commit hooks to improve code quality. The user also made minor changes to code comments and file organization to reflect changes in the documentation.
algorithmic-tradingziplinequantpython
willianpaixao/go-ethereum
Apr 2022 - Jan 2026
Official Go implementation of the Ethereum protocol
Contributions:28 pushes, 6 branches in 3 years 10 months
ethereumgolangblockchainethereum-protocol
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