FreeBSD, BSD, Linux & Unix Systems Engineering

Cross-Platform Unix Expertise

System Architecture & Build Engineering

Greenfield Deployments

• Secure OS installation and baseline hardening
• Filesystem layout design (ZFS, UFS, ext4, XFS)
• Swap and memory architecture planning
• Secure SSH baseline
• Minimal attack surface configuration
• poudriere custom package builds and private repository management
• FreeBSD CURRENT/STABLE branch tracking and source-based upgrades (freebsd-update, buildworld/buildkernel)

Nginx Engineering

• Custom Nginx builds (GeoIP2, HTTP/2/3, TLS optimization, module selection)
• High-concurrency event-driven architecture tuning
• Reverse proxy & load balancing configuration
• FastCGI and upstream performance optimization
• Advanced caching strategy design (microcaching, proxy_cache)
• Rate limiting & traffic shaping configuration
• TLS hardening & cipher suite optimization
• Zero-downtime reload & deployment strategy
• Compile-time optimization & minimal attack surface builds

Apache HTTP Server Engineering

• Custom Apache builds (module selection, TLS hardening)
• MPM optimization (event, worker, prefork modeling)
• Reverse proxy & load balancing configuration (mod_proxy, mod_ssl)
• High-concurrency performance tuning
• PHP integration strategies (mod_php vs PHP-FPM)
• Module hardening & attack surface reduction
• Legacy workload stabilization & modernization

Large-Scale Architecture

• Multi-tier web/application/database clusters
• Load-balanced environments
• Web clusters, API clusters, Redis clusters
• Dedicated database tiers
• High-availability failover designs

Filesystems & Storage Engineering

• ZFS design (pools, datasets, ARC tuning)
• Snapshot and replication strategy
• RAID design and rebuild management
• Disk I/O performance tuning
• NVMe optimization
• LVM configuration (Linux)
• Cross-datacenter replication
• Backup verification automation
• GEOM-based disk management (striping, mirroring, encryption with geli, journaling)

Network Engineering & Services

• TCP/IP stack tuning
• Firewall architecture (pf, nftables, iptables)
• DDoS mitigation design
• Reverse proxy engineering
• HAProxy and Nginx/Apache, PHP, API, CDN load balancing
• BGP integration (where required)
• VPN architecture (WireGuard, IPSec, OpenVPN)
• DNS infrastructure (authoritative & recursive)
• Anycast design concepts
• pf tables, anchors, and ALTQ traffic shaping for FreeBSD firewalls
• VNET jail networking with per-jail virtual network stacks

Performance Engineering & Optimization

• CPU bottleneck analysis
• Memory pressure diagnostics
• Disk I/O deep analysis
• Network packet capture & troubleshooting (tcpdump)
• Kernel tuning (sysctl optimization)
• PHP-FPM pool optimization
• MySQL tuning (buffer pools, indexing strategy)
• Slow query analysis
• High-concurrency workload tuning
• DTrace probes for live kernel and application performance analysis

Security Hardening & Compliance

• SSH lockdown & key-only enforcement
• Jail/chroot isolation
• Intrusion detection deployment
• Automated IP blocking frameworks
• Log monitoring & anomaly detection
• CIS-aligned hardening
• Patch lifecycle management
• Access control policies
• Secrets management integration
• Capsicum capability mode for fine-grained process sandboxing on FreeBSD

Virtualization & Isolation

• FreeBSD jails
• bhyve
• KVM
• VMware
• Containerized workloads (Docker)
• Resource isolation and quotas
• Secure multi-tenant architecture
• rctl resource limits for jail CPU, memory, and process control
• VNET jail networking with dedicated virtual interfaces and routing

Monitoring, Logging & Reliability Engineering

• 24/7 monitoring architecture
• Monit-based automation
• Prometheus & Grafana dashboards
• Custom alerting logic
• Log aggregation systems
• SLA & SLO definition
• Capacity planning & growth modeling
• Proactive failure detection
• Automated remediation scripting
• newsyslog.conf log rotation and compression management on FreeBSD

Automation & Systems Scripting

• Advanced Bash engineering
• Shell-based orchestration frameworks
• AWK / sed / grep pipelines
• Cron fleet management
• Self-healing scripts
• Log parsing engines
• Domain & SSL automation
• Certificate lifecycle automation
• Server provisioning automation
• periodic(8) daily/weekly/monthly task orchestration on FreeBSD

Database Infrastructure Engineering

• Dedicated MySQL server architecture
• Replication (primary/replica)
• Partitioned table strategy
• Monthly growth tracking systems
• Binary log management
• Backup and restore testing
• Storage forecasting
• Query performance engineering

Migration & Recovery Engineering

• Legacy server migrations
• FreeBSD version upgrades
• Linux major-version upgrades
• Cross-platform migrations (Linux to BSD, BSD to Linux)
• Datacenter moves
• Zero-downtime migration planning
• Disaster recovery simulations
• Emergency recovery execution

Operational Leadership

• 24/7 production incident response
• Runbook creation
• Change management discipline
• Infrastructure documentation
• Cost-aware engineering decisions
• Vendor coordination
• On-call architecture design

Advanced Capabilities

• GeoIP-based access control
• Country-level traffic engineering
• Custom traffic filtering engines
• High-volume log processing
• Automated abuse mitigation
• Email infrastructure (Postfix, Dovecot)
• SSL termination clusters
• High-volume domain management automation