Matthias Lamsfuss-Freelance Developer & Founder

Master Agent

Python · Claude Code Harness · Attio API · Microsoft Graph · IMAP · SQLite

• Re-architected the n8n dealflow workflow into a multi-agent orchestrator (deterministic Python boundary + Claude orchestrator).
• Classifier combining deterministic signals + LLM, routing to five specialized agent skills with safety rails applied after the LLM.
• Idempotent CRM writes (deterministic external IDs) and SQLite message-ID idempotency for fully re-runnable processing.
• Orchestrated via a Claude Code harness (cron-driven, no daemon); published a post-mortem on the migration.

Accountant Agent

TypeScript · Claude Code Harness · Supabase · sevDesk · Gmail IMAP · FastAPI

• Built an autonomous German accounting pipeline: invoices arrive by email/iCloud → OCR → VAT classification → sevDesk draft.
• Grew it into a full back-office: CRM pipeline, offers/quotes, contracts, planned invoicing and forecasting (SQL migrations, views, RPCs).
• Multi-turn chat agent with read access to the full Supabase schema and codebase over an SSE stream.
• Triggered via cron/launchd/FastAPI on a Claude Code harness (no long-running daemon).

Company Inspector

Python · LangChain · Next.js · OpenAI · MongoDB · HubSpot · Apollo · Cognism · n8n

• Built a LangChain ICP-research agent that scores B2B companies 0–100 with deterministic, reproducible scoring.
• Data pipeline Apollo.io → MongoDB → agent → HubSpot, with n8n webhook middleware for CRM sync.
• Dual-source contact enrichment (Apollo + Cognism) with a caching layer that eliminates duplicate API spend.
• Next.js dashboard for browsing/validating companies and enriching contacts; Langfuse observability.

Push to Attio

n8n · JavaScript · OpenAI · Firecrawl · Attio CRM API · IMAP

• Built a 53-node VC dealflow pipeline: IMAP email trigger → WhatsApp ZIP parsing → AI extraction → CRM push.
• Two AI stages: URL/metadata extraction and vertical classification (34 verticals, 300+ keywords).
• Firecrawl website enrichment; dual-path routing to Attio Company vs Person records with introducer attribution.
• Error-resilient design: continueRegularOutput on all HTTP nodes, JSON-truncation fallbacks, Discord alerts.

blabladoc

Next.js · TypeScript · LangChain · OpenAI · MongoDB · Stripe · Vercel

• Built a live AI platform that translates complex German medical reports (Arztbriefe) into plain German.
• Two-stage LangChain pipeline: GPT-4o-mini validates the document is medical, GPT-5 translates.
• GDPR architecture: client-side PII anonymization + AES-256 encryption, EU-only MongoDB, OpenAI DPA.
• Client-side OCR (Tesseract.js), Stripe payments, full blog/SEO system.

District VR (DJ Simulator)

TypeScript · Express · TypeORM · PostgreSQL · Supabase · S3 / CloudFront · Railway · Unreal Engine integration

• Since 2021: built the original District backend prototype and the Unreal Engine client integration, wrote the technical spec sheets, and supported early engineering hiring.
• Production REST API for the VR DJ / club simulator on Steam — ~60 endpoints across 10 resource groups.
• Migrated production hosting from AWS EC2 + RDS + CircleCI to Railway + Supabase + push-to-deploy, cutting cost ~$400/mo → ~$0.
• Built the version-tracked GDPR/EULA consent system driving the Unreal client's first-run onboarding (re-consent on policy changes, Discord audit events).
• Implemented store & pricing logic (ownership flags, pro-rated bundle pricing for partially-owned albums), player settings/config, and Steam-ID JWT auth hardening.
• Worked across the asset & album endpoints and the S3 / CloudFront delivery-URL service.