Leo Cavalcante
Staff Software Engineer at PicPay
Brazil
Summary
🤩
Rockstar🎓
Top SchoolLeo Cavalcante is a Staff Software Engineer with 13–15 years of professional experience building backend systems and evolving PHP services at scale, currently driving transactional orchestration for PicPay's financial platform. He blends OOP and functional paradigms with architectural practices like DDD, CQRS, event sourcing and clean architecture, and is hands-on with microservices, Docker/Kubernetes and AWS. An active open-source contributor, he has improved the Hyperf coroutine framework and created focused PHP projects like Siler (a flat-file micro-framework) and a robust encrypt library layering PointyCastle for practical cryptography. He champions test-driven development, refactoring and solid design principles, and also shares knowledge through articles, videos and community events—often helping teams adopt Swoole and Hyperf for high-concurrency PHP services. A designer by education, he brings a pragmatic, design-minded perspective to engineering tradeoffs and developer experience.
13 years of coding experience
Bacharel, Design, 10, Bacharel, Design, 10 at Faculdades Metropolitanas Unidas
Portuguese, English
Stackoverflow
2,417reputation
237kreached
19answers
37questions
php
top-5%
row
top-1%
csv
top-5%
Github Skills (38)
swoole10
url-routing10
caesar-cipher10
row10
block-cipher10
sas10
microservices-application10
opentracing10
rsa10
crypt10
php10
cryptography10
aes10
microservices10
coroutines10
Programming languages (28)
Github contributions (5)
leocavalcante/siler
Dec 2016 - Feb 2022
⚡ Flat-files and plain-old PHP functions rockin'on as a set of general purpose high-level abstractions.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:42 releases, 83 reviews, 1234 commits in 5 years 3 months
Contributions summary:Leo primarily contributed to the PHP-based flat-file micro-framework, implementing features such as request handling, and templating. The user introduced essential components to build a web application including ENV management, routing, request handling, and rendering via Twig. They also added test cases and refactored code to leverage constants and make the code cleaner.
micro-frameworkguzzleroadrunnersilerhigh-level
leocavalcante/encrypt
Jul 2018 - Aug 2021
🔒 A set of high-level APIs over PointyCastle for two-way cryptography.
Role in this project:Back-end Developer
Back-end DeveloperContributions:6 releases, 16 reviews, 103 commits in 3 years 1 month
Contributions summary:Leo primarily contributed to the implementation of cryptographic algorithms within the repository. They added AES and Salsa20 implementations using the PointyCastle library. Further work involved the addition of an RSA implementation and its associated key parsing, as well as incorporating Fernet. This user demonstrated a strong understanding of cryptographic principles and API design.
cryptographysalsa20rsaaeshigh-level
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