Gabriel Clima

• Nginx and OpenResty development on the CDN edge.
• Perf profiling: flame graphs, off-CPU analysis.
• Linux kernel bottleneck investigations — fs, mm, network stack.
• Lua-C FFI interactions.
• Functional testing CI/CD.
• Gcov coverage testing.
• JA3/JA4 TLS fingerprinting.
• Netlink socket statistics exporter.
• Automated lock-contention detector for nginx.
• bpftrace usage popularization.
• Go-lang service debugging.
• DEB and RPM packaging.
• Sysctl tuning — page-fault rate, TCP buffer sizing, etc.
• Nginx configuration design for specific workloads.
• Upstream community engagement.
• Saved million(s) $$ contract deals by delivering features on hard deadlines.

• 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.

• 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, 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.

• 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.

No, that is not a BSc or equivalent. Monetary constraints forced me out of the higher-education system and into the job market straight out of high school. The 2017–2019 gap between vocational school and my first Linux Admin job was me working with Apollo, Sabre, and Amadeus GDS airline ticketing systems.