Carl Mastrangelo
Software Engineer at Netflix
United States
Summary
🤩
Rockstar🎓
Top SchoolCarl Mastrangelo is a seasoned software engineer with 13 years of experience building high-performance, networked systems at Google and Netflix and most recently serving as Staff Software Engineer at CloseFactor before returning to Netflix. He specializes in backend engineering, protocol and transport layers (notably gRPC and Netty), and performance-sensitive protobuf and native integrations, with a track record of fixing race conditions, improving resource contention, and hardening streaming and gateway components. His open-source contributions to flagship projects like grpc, grpc-java, grpc-go, Netty, and Netflix Zuul demonstrate deep expertise in HTTP/2-based RPC, JNI/native build issues, and production-grade reliability. Based in the U.S. and a Georgia Tech CS graduate, he combines systems-level rigor with pragmatic refactors and thorough testing—and he also streams live technical work, offering a rare window into real-time problem solving.
13 years of coding experience
12 years of employment as a software developer
Bachelor's degree Computer Science, Bachelor's degree Computer Science at Georgia Institute of Technology
Stackoverflow
6,410reputation
380kreached
89answers
15questions
protocol-buffers
top-1%
java
top-5%
http
top-5%
grpc
top-1%
netty
top-5%
rest
top-1%
Github Skills (56)
algorithm10
asynchronous10
unit-testing10
code-optimization10
algorithms10
google-cloud-platform10
netty10
async10
protocol-buffers10
http10
build-system10
c1110
resource-management10
network-programming10
java10
Programming languages (10)
Github contributions (5)
grpc/grpc-java
Jul 2015 - Mar 2022
The Java gRPC implementation. HTTP/2 based RPC
Role in this project:
Back-end Developer
Back-end DeveloperContributions:12 releases, 2 reviews, 697 commits in 6 years 9 months
Contributions summary:Carl contributed to the gRPC Java implementation, specifically in the Netty transport layer and core protobuf libraries. Their work involved refactoring and fixing bugs in the handling of protocol negotiation and stream management. The user's contributions focused on ensuring correct handling of incoming data, resolving performance issues, and making the library more robust by addressing race conditions.
rpcgrpc-javaprotobufgrpcnetty
Netflix/zuul
Aug 2019 - Sep 2021
Zuul is a gateway service that provides dynamic routing, monitoring, resiliency, security, and more.
Role in this project:Back-end Developer
Back-end DeveloperContributions:68 reviews, 206 commits, 442 PRs in 2 years
Contributions summary:Carl primarily worked on the core components of the Zuul gateway service, focusing on handling proxy protocol messages and implementing various aspects related to network connection management. They addressed issues with HAProxy message handling, including releasing messages correctly and adjusting the release count. Furthermore, the user added unit tests to ensure the robustness and reliability of the code changes. The user also refactored the code to use a better internal model of connection addresses.
api-gatewaygolangsecurityresiliencygateway-service
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