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» /github_activity_log — full list of public PRs, issues, discussions, and commits.
Gabriel Clima
b. 1997 · Romania
Work
Software Engineer — Gcore
Sep 2023 — present
nginx / OpenResty / C / Lua / BPF
- nginx and OpenResty development on the CDN edge.
- Performance profiling: flame graphs, off-CPU analysis, kernel-level bottleneck research (filesystem and network stack) relevant to nginx behavior under load.
- Contributed Lua-C FFI code to OpenResty, merged upstream.
- Wrote functional tests for the nginx CI/CD pipeline; automated GDB-driven tests.
- TLS fingerprinting work in OpenSSL.
- Trace syscalls and kernel probes back to problematic user-space code paths.
- Built a socket-statistics exporter on top of Netlink.
- Built an automated lock-contention detector for nginx.
- Popularized
bpftrace internally for performance analysis and debugging.
- Debug nginx-adjacent services: a UDP syslog exporter and a Go-based configuration manager.
- DEB and RPM packaging.
- Collaborate with ops on sysctl tuning — page-fault rate, TCP buffer sizing, etc.
- nginx configuration design for specific workloads.
- Linux kernel code research.
- Contribute bug reports and patches to upstream nginx.
Linux Systems Engineer — Gcore
Aug 2022 — Sep 2023
- CDN operations: SRE, RAID, Linux, observability (Prometheus, Grafana), BGP routing.
- Debugging Go services.
- Bash, Python, Lua scripting; Puppet configuration management.
- CI/CD pipelines (Drone, GitHub Actions); package and repository management (DEB, RPM).
- System-call tracing (
strace, ltrace); internal wiki documentation.
- Designed and executed an on-the-fly migration of the metrics-exporting system from server-pull to agent-push.
- Identified an Intel ICE NIC driver issue in the Linux kernel.
- Virtualization (QEMU); Docker; minor Kubernetes.
Linux Systems Engineer — Gilat Satellite Networks
May 2021 — Aug 2022
- Satellite ground station maintenance, configuration, support; ran our laboratory setup.
- Stack: RF, TCP/IP, Linux (RHEL, Debian), Cisco/Juniper, VerticaDB, PostgreSQL, virtualization, SNMP, SOAP, bash, Python.
- Linux administration; proprietary VxWorks-based RTOS; process and cluster maintenance; scripting.
- Postgres / VerticaDB maintenance; bare-metal and VM ops; performance data analysis.
- Configured and debugged Cisco / Juniper / proprietary network gear.
- SATCOM: MODCOD changes, RF spectrum analysis, frequency migrations, DVB-S2 / S2X troubleshooting (inbound and outbound).
- Identified interference and attenuation (compression, P1dB) across the RF chain — modulators, demodulators, LNB, BUC, satellite.
Linux Network Administrator — Unifun International
Nov 2019 — May 2021
- Linux, TCP/IP, SQL; bash scripting; customer support.
- IPsec and OpenVPN troubleshooting.
- Log parsing and analysis; automation of repetitive processes.
- Maintenance of 300+ distributed Linux servers.
- Incident root-cause analysis, prioritization, and escalation.
- Nagios monitoring across Linux (Ubuntu, RHEL, CentOS) and Windows servers.
Education
Radio-electronic Systems — Republican College of Microelectronics and Computer Technology, Moldova
2013 — 2017
- Vocational school, grades 10–12 + 1 year of strictly vocational subjects.
- Semiconductors (silicon doping, diodes, transistors, logic gates, chips, CPUs); assembly programming; AutoCAD.
- Circuit analysis and design; radio signal modulation / demodulation.
Personal projects
- nginx-bpftrace-snippets — bpftrace scripts for nginx performance insights.
- gmss — dump TCP socket stats and aggregate on columns (Netlink-based).
- claudit — auditable logging service for Claude.
- atonal_c — byte bebop, in C.
Interests
Operating-system internals. Reading Kerrisk, Tanenbaum, and LWN in spare time.
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