Backend: Python (asyncio, threading, multiprocessing), Golang, FastAPI, Django, aiohttp, gRPC, GraphQL
Networking: TCP/IP, UDP, DNS, SMTP/POP3/IMAP, HTTP/2, WebSockets, QUIC, Packet analysis
P4/Switching: P4 programmable switches, SDN, OpenFlow, network filters, packet parsing
Databases: PostgreSQL, ClickHouse, SQLite, Redis, Elasticsearch, MongoDB, DynamoDB, MinIO
Search & Analytics: Elasticsearch, OpenSearch, Quickwit, Meilisearch, Loki, vector search
Observability: Prometheus, Grafana, Alertmanager, Loki, Jaeger, OpenTelemetry, custom exporters
Storage: MinIO (S3-compatible), Ceph, NFS, iSCSI, local storage optimization, tiered storage
Containers: Docker, Kubernetes, Helm, Kustomize, container security, multi-stage builds
CI/CD: GitLab CI/CD, GitHub Actions, Jenkins, ArgoCD, Argo Workflows, Tekton
Linux: systemd, cron, journald, strace, lsof, tcpdump, perf, eBPF, kernel tuning
Cloud: AWS (EC2, S3, RDS, Lambda, ECS, EKS), GCP, Hetzner, self-hosted
Security: TLS/SSL, firewall (iptables, nftables), fail2ban, VPN (WireGuard, OpenVPN)
Agents & AI: LLM integration, RAG systems, vector databases, prompt engineering, AI agents
APIs: REST, GraphQL, gRPC, webhook integration, API gateways, rate limiting
Queue & Streaming: RabbitMQ, Kafka, Redis Streams, Celery, task scheduling
Infrastructure as Code: Terraform, Ansible, Packer, Vault, Consul, Nomad