Case Studies
Automation, integrations, accounting systems, and open-source engineering.
Tutorial: build a resilient CLI for a click-first supplier portal
How hamberger-dl replaces repeated portal clicks with a Bash CLI: Keycloak OIDC with PKCE, protected token caching, filtered REST retrieval, safe PDF re-runs, and ZIP exports.
My first merged open-source contribution: a streaming LLM provider
A merged Rust worker added OpenCode Go Chat Completions, SSE streaming, model discovery, tool calls, structured output, and router integration to iii.
Tutorial: attach payout evidence without wrong matches
A scheduled n8n pattern that attaches payout PDFs to the right Lexware vouchers: destination pre-checks, explicit match states, dry runs, paced writes, and per-item audit outcomes.
Tutorial: design accounting automation that fails closed
A fail-closed n8n architecture for reconciling one SumUp business day at a time, persisting an immutable plan, recovering writes, and proving every Lexware result.
Tutorial: turn supplier PDFs into idempotent Lexware records
A production n8n pattern for parsing German supplier invoices, preserving printed tax buckets, detecting credit notes, avoiding duplicate vouchers, and attaching source evidence.
Tutorial: build a safe public-record intake workflow
How a public legal guide became a 50,000-person intake pipeline: explicit retrieval outcomes, duplicate-safe records, approved routing, and channel-aware delivery.