Gabriel Clima

• Nginx and OpenResty development on the CDN edge.
• QUIC/HTTP3 internals: ported qlog transport-layer tracing into the nginx fork; debugged QUIC handshake and connection-close edge cases in production.
• eBPF in the QUIC datapath: quic_bpf worker socket routing fixes.
• Perf profiling: flame graphs, off-CPU analysis.
• Linux kernel bottleneck investigations — fs, mm, network stack.
• Production crash forensics: GDB coredump analysis; root-caused multiple use-after-free and buffer-overlap bugs in C and Rust integration code.
• Deep HTTP caching semantics: root-caused a cache-poisoning bug in slice+redirect interaction; quantified negative-caching amplification during origin stalls for a tier-1 client RCA.
• signal/noise coincidence/causation discipline on TB-volume telemetry
• Forensic SQL over petabyte-scale ClickHouse request logs: per-connection joins, hop-depth analysis, sampling strategies under hard memory limits.
• Lua-C FFI interactions.
• Functional testing CI/CD.
• Gcov coverage testing.
• Built an AddressSanitizer package variant of the production nginx build for CI and live-fleet crash reproduction.
• JA3/JA4 TLS fingerprinting.
• Netlink socket statistics exporter.
• Automated lock-contention detector for nginx.
• Internal tooling evangelism: bpftrace snippet library, reproducible demo-config methodology, internal wiki deep-dives adopted by the team.
• Industrialized LLM tooling, agent prose version control, auditable agent logging, bloat management, and multi-agent fleet operations, token optimal agents and skills.
• Go-lang service debugging.
• DEB and RPM packaging.
• Sysctl tuning — page-fault rate, TCP buffer sizing, etc.
• Nginx configuration design for specific workloads.
• Staged canary rollouts across a global edge fleet: soak gates, per-stage health auditing, promote/rollback judgment, rollout postmortems.
• Incident coordination for tier-1 clients: war-room lead, division of labour, RCA authorship, client-facing incident timelines under active escalation.
• Open source community engagement and contributions.
• Delivered contract-critical features on hard deadlines for deals worth millions of dollars; led the technical response in the resulting client-facing incidents and RCAs.

• 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.

Operating-system internals. Reading Kerrisk, Tanenbaum, and LWN in spare time.