Christiano Haesbaert
Software Engineer at elastic
Munich, Bavaria, Germany
Summary
🤩
Rockstar🎓
Top SchoolChristiano Haesbaert is a seasoned UNIX-focused software engineer with 18 years of experience specializing in OpenBSD, network stacks, and low-level systems programming. Based in Munich, he blends kernel and userland expertise (C, sockets, ksh, python, lua, OCaml) with pragmatic DevOps skills, contributing to high-profile open-source projects like elastic/beats and the OCaml runtime. His work spans improving process correlation and robustness in observability tooling to enhancing concurrency and domain handling in a language runtime, reflecting a knack for fixing subtle, hard-to-reproduce issues. A self-described "UNIX hacker" who enjoys breaking software to make it better, he brings deep protocol and OS-level knowledge to complex networking and performance problems.
18 years of coding experience
Colégio FarroupilhaBachelor, Computer Science, Bachelor, Computer Science at Pontifícia Universidade Católica do Rio Grande do Sul / PUCRSGoethe Institut
German, Spanish, Portuguese, English
Stackoverflow
31reputation
27kreached
1answer
0questions
Github Skills (23)
multithreading10
linux10
ocaml10
packetbeat10
go10
concurrency10
amazon-elasticsearch9
system-programming9
filebeat9
functional9
aws-elasticsearch9
elasticsearchquery9
functional-programming9
elasticsearch-api9
functional-programming-language9
Programming languages (13)
Github contributions (5)
elastic/beats
Oct 2023 - Mar 2025
:tropical_fish: Beats - Lightweight shippers for Elasticsearch & Logstash
Role in this project:
Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:79 reviews, 39 PRs, 122 pushes in 1 year 5 months
Contributions summary:Christiano contributed to the `elastic/beats` repository, focusing on enhancing system process monitoring and performance. They implemented capabilities normalization and auditbeat process support, adding thread capabilities to process metadata. They also addressed issues related to port mapping expiration in packetbeat to improve process correlation accuracy. Furthermore, the user made improvements to the hasher to fix a TOCTOU and made the hasher more robust, allowing for infinite rate for the new backend.
tropicalheartbeatlogstashbeatsfilebeat
ocaml/ocaml
Jun 2022 - Jan 2023
The core OCaml system: compilers, runtime system, base libraries
Role in this project:Back-end Developer
Back-end DeveloperContributions:3 reviews, 8 commits, 7 PRs in 7 months
Contributions summary:Christiano contributed to the core OCaml system by addressing several key areas. They added a function to request the recommended maximum number of Domains and implemented necessary changes across multiple files, including `domain.c`, `domain.ml`, and associated test files. The user also modified build configurations to correct signal masking within systhreads and removed references to deprecated features. Their work primarily focused on improving the concurrency and core functionality of the OCaml runtime environment.
functional-languagecompilersruntime-systemapllwt
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