Networking
TCP/IP
BGP
OSPF
MPLS
L2VPN
L3VPN
Optical network
IPv6
IPv6 transition technologies (DS-Lite, MAP-E)
Network design
HTTP & DNS
HTTP
HTTP/2 / HTTP/3
HTTPS (TLS)
mTLS
Authoritative DNS (BIND, Route 53, Zone transfer, etc.)
OCSP
ACME
DNSSEC
SMTP
ActivityPub
Cloud & Middleware
Nginx
Content Delivery / CDN (Cloudflare, AWS, etc.)
Object Storage (S3, R2, etc.)
Serverless (Lambda, Cloudflare Workers, CloudFront Functions)
Docker
Kubernetes
PostgreSQL
Elasticsearch
Observability & SRE & Performance
Prometheus
VictoriaMetrics
Grafana
Loki
Fluent Bit
SNMP
Web performance (Core Web Vitals, etc.)
RUM (Real User Monitoring)
SLO Design
CI/CD
GitHub Actions
GitOps
Security
WAF
Web security (CSP, etc.)
DDoS mitigation
Rate limiting
Bot mitigation
Application
Ruby on Rails
Next.js
Python
Go
Other
Project management
English