POS. S-01
Process Automation (without AI)
- Workflow automation with n8n
- ERP, e-mail, DMS & API integration
- Data integration between systems
- Reporting pipelines
Freelance IT consultant · Cologne · Remote-first
Automation & DevOps for the German Mittelstand — with and without AI
Process automation (n8n) · AI integration (LLM, Claude API) · DevOps & self-hosted infrastructure — GDPR-compliant, on-premise or in your cloud
GDPR-compliantOn-premise or cloudNo vendor lock-in
Service index
Services
Three fields, one principle: process first, then tooling. AI joins in where it measurably helps — not the other way around.
POS. S-02
AI Automation
- LLM integration — Claude API, local models
- RAG pipelines
- Multi-agent systems
- LLM-powered document & invoice processing
POS. S-03
DevOps Consulting & Infrastructure
- Proxmox, Docker, CI/CD
- Mesh VPN & backup strategies
- Architecture, setup & operation of self-hosted environments
Case studies
Selected Projects
Every project starts with an architecture sketch. Three examples following the same pattern: problem, architecture, result.
Order & document processing automated — trading company, Cologne
- Problem
- Orders, supplier documents and customer inquiries arrived by e-mail and were transferred into the merchandise management system and filing by hand — hours of routine work per week, plus typos and media discontinuities.
- Architecture
- A central self-hosted n8n instance as the integration hub: IMAP inbox, merchandise management and document filing connected via APIs; automatic matching and filing, daily reporting pipeline (Fig. 1).
- Result
- The standard case runs through without manual steps; documents are filed audit-proof and key figures are up to date daily. hrs/week of routine saved
LLM-powered invoice processing — service business
- Problem
- Incoming invoices in widely varying formats had to be checked, entered and filed manually — time-consuming and error-prone.
- Architecture
- An n8n pipeline with LLM extraction (Claude API): PDF and e-mail intake, structured capture of amounts, line items and tax rates, rule-based plausibility checks, hand-over to accounting and DMS — sensitive data stays in the company's own environment (Fig. 2).
- Result
- Invoices are pre-captured in seconds; only the exceptional case is checked manually. pre-capture in seconds
Self-hosted company IT — SME, two sites
- Problem
- An organically grown server landscape without a backup concept, critical services scattered across providers, no overall picture.
- Architecture
- Proxmox virtualization with Docker workloads, Git-based deployments (CI/CD), WireGuard mesh VPN between the sites, encrypted offsite backups and central monitoring (Fig. 3).
- Result
- All services are reproducible from Git and restorable from backup; maintenance runs remotely and costs are predictable. recovery tested
Person & approach
About me
I'm Igor Stolyarevskiy, an IT consultant based in Cologne. I design, build and operate automation and self-hosted infrastructure for small and mid-sized companies — from the first process sketch to day-to-day operations. I know the starting point from my own entrepreneurial experience: organically grown systems, manual processes and the question of what automation actually delivers.
I favor self-hosted solutions and open standards — systems you can understand, control and keep operating yourself. AI comes in where it measurably helps.
Inquiry
Contact
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