Leandro Fernandes
Software Engineer Tech Lead at Stone
São Paulo, Brazil
Summary
🤩
Rockstar🎓
Top SchoolLeandro Fernandes is a Software Engineer and Tech Lead with 11 years of experience building high-performance, scalable backend systems in C# and .NET, currently leading engineering and people at Stone Pagamentos in São Paulo. He specializes in clean, maintainable code, functional techniques with F#, design patterns and SOLID principles, balancing craftsmanship with pragmatic trade-offs when business needs demand. At Stone he has driven treasury platforms handling millions of requests per day and overseen observability, CI/CD and performance testing to ensure availability and throughput. A Microsoft Certified Professional, he is also an active open-source contributor—maintaining one of the fastest CSV parsers for .NET and significantly extending the well-known MoreLINQ library with many utility operators. Comfortable both coding and mentoring, he combines hands-on implementation of critical systems with hiring, performance reviews and technical strategy.
11 years of coding experience
1 year of employment as a software developer
Escolas Técnicas EstaduaisTecnólogo em Análise e Desenvolvimento de Sistemas, Programação de Computadores, Tecnólogo em Análise e Desenvolvimento de Sistemas, Programação de Computadores at Faculdade de Tecnologia de São Paulo - FATEC-SP
Portuguese, English
Github Skills (15)
net10
asp-net10
magento-extension10
webextension10
csharp10
extension-methods10
linq10
dotnet-core10
testing9
dotnet-new9
dotnet9
functional-programming9
algorithms8
data-structures8
data-structure8
Programming languages (5)
Github contributions (5)
morelinq/MoreLINQ
Oct 2016 - Nov 2021
Extensions to LINQ to Objects
Role in this project:
Back-end Developer
Back-end DeveloperContributions:9 reviews, 84 commits, 104 PRs in 5 years 1 month
Contributions summary:Leandro contributed significantly to the `morelinq/morelinq` repository, focusing on extending LINQ to Objects with new methods. Their work included implementing several new methods such as `CountBy`, `AtMost`, `Exactly`, `CountBetween`, `SkipLast`, `AggregateRight`, `Unfold`, `ScanRight`, `Sequence`, `Repeat`, `SkipLast`, `Move`, `Insert`, `Flatten`, `Shuffle`, `Backsert` and `IndexBy`. This involved writing the core logic, implementing the necessary tests, and ensuring proper functionality within the existing framework of the project.
discriminated-unionsdotnetcsharp-sourcegeneratorroslyn-analyzerc-sharp
leandromoh/RecordParser
May 2020 - Dec 2022
Zero Allocation Writer/Reader Parser for .NET Core
Contributions:6 reviews, 198 commits, 161 PRs in 2 years 7 months
csvspanreaderparserzero
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