Andrei Călin
Backend Architect at refurbed
Sibiu, Romania
Summary
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RockstarAndrei Călin is a Backend Architect with 11 years of experience building high-performance networked systems from Sibiu, Romania. He currently leads backend architecture at refurbed after senior engineering roles at Flink, combining hands-on systems programming with strategic platform design. Andrei is an active open-source contributor to core Go networking, contributing optimizations like splice-based zero-copy TCP reads and low-level netlink socket improvements that reduce copies and improve poll/deadline behavior. He brings deep expertise in concurrency, syscall-level performance, and test-driven robustness, often tackling subtle edge cases and deadlocks. Practical and detail-oriented, he blends kernel-aware optimizations with production-ready engineering and a track record of improving foundational libraries used by many Go projects.
11 years of coding experience
1 year of employment as a software developer
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (13)
golang10
linux10
go10
networking10
netlink10
tcp9
concurrency9
system-programming9
socket9
syscall9
build-system8
programming-language8
testing8
Programming languages (3)
Github contributions (5)
mdlayher/netlink
Jan 2019 - May 2019
Package netlink provides low-level access to Linux netlink sockets (AF_NETLINK). MIT Licensed.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 commits, 1 PR, 7 pushes in 4 months
Contributions summary:Andrei primarily focused on enhancing the `netlink` package, specifically its interaction with the Linux kernel. They implemented the usage of a network poller for improved socket operations, including deadline functionality, and refactored goroutine management. Code changes included adding read, write, and control methods to the `sysSocket` and switching to the use of `os.File`. Furthermore, the user updated build tags for Go 1.12 and improved tests.
linuxnetlinkgolanggoaf-netlink
golang/go
Aug 2018 - Aug 2018
The Go programming language
Role in this project:Back-end Developer
Back-end DeveloperContributions:1 commit, 68 comments, 6 issues in 1 day
Contributions summary:Andrei's contributions primarily focused on optimizing network performance within the Go programming language. They implemented the `splice` system call for TCP connections to reduce data copies, enhancing the efficiency of `ReadFrom` operations. Further improvements included refactoring tests to handle edge cases related to `splice` and unix socket connections, along with addressing potential deadlock issues within the `internal/poll` package related to the `Splice` function. The user also refactored an existing test and fixed related bugs.
goprogramming-languagegolang
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