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 Prometheus system from server-pull to agent-push.
• Identified an Intel ICE NIC driver issue in the Linux kernel.
• Virtualization (QEMU); Docker.

• 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.

• GDS: Apollo, Sabre, Amadeus.

• 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.
• Pascal programming.

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