Sérgio Fonseca
CTO at Oxpay
São Paulo, Brazil
Summary
👤
Senior🎓
Top SchoolSérgio Fonseca is a technology leader and CTO based in São Paulo with over a decade of hands-on programming experience and nine years of professional work in payments and fintech. He began coding at 13 and has deep expertise in C#/.NET, C/C++, Golang and Python, complemented by strong backend architecture skills—SOLID, clean code, microservices, SQL, Redis and Docker. His career spans game development to embedded payment systems and large-scale payment platforms, including senior engineering at Cappta and developer roles at Stone Pagamentos. Known for blending low-level systems thinking with pragmatic product delivery, he also brings security and observability experience (Splunk, CI, REST). A native Portuguese speaker fluent in English, he combines early passion for coding with proven leadership in building reliable payment infrastructure.
10 years of coding experience
11 years of employment as a software developer
Instituto Infnet
Github Skills (57)
easyhook9
dotnet8
docker-image8
csharp7
markdown7
nodejs7
interpreter7
parsing7
visual-studio7
golang6
go6
orm6
windows6
java6
javascript6
Programming languages (9)
Github contributions (5)
Cappta/GoHttpsClientDll
Nov 2017 - Jan 2019
Golang's HTTPS client wrapper as DLL compatible with windows XP
Contributions:6 commits, 3 PRs, 1 push in 1 year 2 months
dllgolanghttps-clientwindows-xp
Cappta/GoHttpsClientForCSharp
Nov 2017 - Jun 2021
Wrapper for GoHttpsClient in CSharp .NET
Contributions:13 commits, 4 PRs, 6 pushes in 3 years 7 months
csharpdotnet
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