Fausto Rosario
Staff Engineer at RTL Nederland
Amsterdam, North Holland, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolFausto Rosario is a Staff Engineer based in Amsterdam with 10 years of experience building reliable, high-performance backend systems and developer tooling. He combines SRE-driven practices with a strong focus on developer experience, having implemented SLO-based alerting, progressive delivery with Argo Rollouts, and integrated observability stacks using OpenTelemetry, Tempo, Elasticsearch and Prometheus. Fausto has hands-on expertise in C# and Go, authored an internal Golang release-note manager (Thor), and improved video playout and ad ingestion pipelines at RTL Nederland. As a performance-minded contributor to the popular RestSharp .NET client, he optimized serialization paths by integrating Utf8Json and reducing allocations for real-world throughput gains. He has a track record of extracting high-performance features from legacy systems—such as an allocation-free autocomplete pipeline built on a Ternary Search Tree—and a pragmatic approach to reducing MTTR and operational toil.
9 years of coding experience
6 years of employment as a software developer
Bachelor of Science (B.Sc.) Systems Engineer, Bachelor of Science (B.Sc.) Systems Engineer at Instituto Tecnológico de Santo Domingo
Spanish, English, Dutch
Stackoverflow
1reputation
0reached
1answer
0questions
Github Skills (15)
performance-tuning10
deserialization10
net10
asp-net10
benchmarking10
data-serialization10
dotnet10
benchmark10
csharp10
dotnet-core10
serialization10
testing9
gitops6
argocd6
kubernetes6
Programming languages (8)
Github contributions (5)
restsharp/RestSharp
May 2020 - May 2020
Simple REST and HTTP API Client for .NET
Role in this project:
Back-end Developer & Performance Engineer
Back-end Developer & Performance EngineerContributions:6 commits, 1 PR, 2 comments in 1 day
Contributions summary:Fausto primarily contributed to optimizing the RestSharp library's serialization and deserialization performance. They focused on integrating and benchmarking the Utf8Json library, enhancing the use of byte arrays for improved efficiency. The user also refactored and cleaned up code related to serialization, including removing duplicated classes and fixing associated tests, demonstrating a focus on performance improvements.
api-clientapidotnethttp-api-clientcsharp
faustodavid/HexConverter
May 2020 - Mar 2021
High-Performance hexadecimal converter
Contributions:43 commits, 2 PRs, 32 pushes in 9 months
azerothcorehexadecimal-converterhexadecimalperformancealtium-designer
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