Johnny A
Bitcoin OpenSource Developer at Vinteum
Santa Catarina, Brazil
Summary
👤
SeniorJohnny A is a Bitcoin-focused open-source developer with 10 years of experience building backend, cloud, mobile and full-stack systems, currently contributing at Vinteum. He founded and engineered a self-custodial Bitcoin app, shipping a beta and integrating multiple liquidity providers before pausing due to regulatory shifts, demonstrating product-led engineering and risk-aware decision making. At OpenNode he stabilized APIs, reworked infrastructure for efficiency, and introduced IaC and CI/CD to reduce cost and operational friction. His open-source contributions include backend work on the well-known OmniSharp/omnisharp-roslyn project, improving MSBuild discovery and project handling—evidence of deep build-system and tooling expertise. Comfortable across languages and stacks, he pairs pragmatic DevOps and cloud migrations with a strong focus on security, transparency and continuous delivery. Based in Santa Catarina, Brazil, he’s self-taught, curious, and balances technical experimentation with family life.
11 years of coding experience
10 years of employment as a software developer
English, Portuguese
Stackoverflow
35reputation
2kreached
5answers
1question
Github Skills (20)
roslyn10
msbuild10
net10
dotnet10
asp-net10
dotnet-sdk10
dotnet-core10
csharp10
unit-test8
xunit8
unit-testing8
netcore6
html6
google-sheets6
sqlanywhere6
Programming languages (30)
Github contributions (5)
OmniSharp/omnisharp-roslyn
Dec 2018 - Jan 2019
OmniSharp server (HTTP, STDIO) based on Roslyn workspaces
Role in this project:
Back-end Developer
Back-end DeveloperContributions:5 commits, 2 PRs, 18 comments in 1 month
Contributions summary:Johnny primarily contributed to the OmniSharp server, focusing on MSBuild integration and configuration. Their work involved modifying the MSBuild discovery process, including handling .NET SDK resolvers and Visual Studio versions. They also updated project file handling and related tests, indicating a focus on build process improvements and related service enhancements. Furthermore, the user touched code related to formatting options in the C# language service.
omnisharproslynstdiocsharpdotnet-sdk
johnnyasantoss/blog
Mar 2022 - Jul 2026
https://yakshaver.org
Contributions:12 pushes, 4 branches in 4 years 4 months
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