HOFFMAN

Raft consensus from scratch: linearizable replicated KV with Pre-Vote, CheckQuorum, ReadIndex, snapshots; porcupine-checked, chaos-tested 3-node cluster.

Reliable event-driven services on NATS JetStream: transactional outbox, idempotent consumers, sagas with compensation, DLQ + replay, OpenTelemetry.

Token bucket + sliding window log on atomic Redis Lua scripts, in-memory backend, net/http middleware, HTTP /check service, Prometheus.

Realtime collaborative text + whiteboard on a from-scratch CRDT (RGA + LWW): WebSocket sync, presence, offline merge, fast-check convergence tests.

Identity-aware reverse proxy: OIDC/JWT with JWKS rotation, PKCE, deny-by-default YAML policy, mTLS 1.3 upstreams, JSON audit log.

Sandboxed WebAssembly component plugin host on wasmtime: per-call fuel, memory, wall-clock and capability limits.

Passwordless website login through a Telegram bot: FastAPI + aiogram 3 + Redis, attempt limits, rate limiting, threat model, full test suite.

Generic Linux VPS hardening templates: nginx, Cloudflare, backups, systemd timers, Docker, health checks.

Kubernetes operator (controller-runtime): Tenant CRD provisions isolated namespaces with quotas, NetworkPolicies, RBAC, Pod Security; envtest + kind e2e.

Hardened Helm chart promoted dev → staging → prod by an Argo CD app-of-apps, proven on kind in CI (helm-unittest, kubeconform, self-heal drill).

Reusable Terraform modules (naming, VPC, secure S3) with secure defaults, tflint and native terraform test on mocked providers.

eBPF network monitor: cgroup_skb per-flow accounting (IPv4/IPv6), top-talkers CLI, bounded-cardinality Prometheus exporter, kernel tests in CI.

Monitoring in one compose: Prometheus, Alertmanager → Telegram, provisioned Grafana, Loki + Alloy, node-exporter, cAdvisor; rules tested in CI.

Bash toolbox: server bootstrap and SSH hardening, Docker install, restic S3 backups, TLS expiry and uptime checks; ShellCheck-clean, bats-tested.

Fast CLI to tail, filter and aggregate structured logs (JSON, logfmt, nginx): query language, top-N, exact latency percentiles, follow mode.

Private ChatGPT-style stack on a CPU-only VPS: Ollama + Open WebUI + hardened FastAPI gateway + Caddy auto-TLS, e2e-tested with a real model.

CPU-only RAG: heading-aware chunking, float32 + int8 vector store, BM25 + dense hybrid (RRF), cited answers, retrieval eval gated in CI.

HNSW vector index from scratch: heuristic neighbour selection, filtered search, deletes, checksummed format, CLI + axum HTTP server, recall gates.

Volumetric tactical HUD on Three.js WebGPURenderer + TSL with automatic WebGL2 fallback: holographic radar, GPU particles, bloom.

Cyberpunk / HUD UI components in plain CSS + dependency-free JS: glitch titles, CRT power-off, nixie countdown, HUD panels, terminal typing.

This site: cyberpunk 3D parallax HUD portfolio in a single dependency-free HTML file.

Production FastAPI template: async SQLAlchemy 2 + Alembic, Postgres, Redis rate limiting, JWT with Argon2, structlog, Prometheus, mypy strict.

Async Telegram bot template: aiogram 3, pydantic-settings, inline menus, optional local LLM via Ollama, Docker.

Quality suite for any website: Playwright E2E on 5 browsers/devices, API contracts, axe, visual regression, Lighthouse CI, k6, OWASP ZAP.