- 💼 Freelance Software Engineer — building automation and web platforms for Swiss SMEs, from a full operations platform for a taxi company (admin, driver and customer portals, live map, Swiss QR-bill, Stripe incl. TWINT) to AI-assisted workflows for a bakery & café
- 🤖 Previously at BeSync AG, Zurich — first as Automation Engineer, then Frontend & AI Developer: AI agents with self-healing components that detect and mitigate issues on their own, a cross-department KPI dashboard, and a SaaS that unifies several systems into one customer view
- 🏗️ Backend depth: Java 25 / Spring Boot, FastAPI, PostgreSQL + pgvector, Row-Level Security, multi-tenancy
- 🧬 Side projects in ML & health tech — local LLM fine-tuning, MLOps, and evidence-grounded tooling for oncology research
- 🌍 17 merged pull requests in upstream open source — Dify, Webbrain, WorldWideView — with open PRs at Scanpy, Excalidraw and Infisical
- 🇨🇭 Based in Aargau, Switzerland — open to AI Engineering and Full-Stack roles as well as freelance projects
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Issues Swiss QR-bills, matches incoming payments from camt.054 files automatically and runs a multi-level dunning process — multi-tenant from day one. Modular Spring Modulith backend, Keycloak auth, an API contract checked in CI, and Playwright E2E tests against the full Compose stack.
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Scraper → cleaning → versioned store → API. When a source changes its layout, the extractor is repaired automatically — value anchors, then a DOM diff, then an LLM that only sees the changed subtree and may only edit a schema-validated config. A fix ships only after it passes a gate against known-good pages; otherwise a human gets an incident with the evidence attached.
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A privacy-first tutoring system for schools, built for minors: a LangGraph teaching agent that explains and quizzes, an inspectable Bayesian Knowledge Tracing model per student, and a teacher view to verify and override. Isolation via Row-Level Security, PII anonymised before any LLM call, CH/EU data residency.
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QLoRA fine-tune of Qwen2.5-3B-Instruct that turns doctor–patient dialogues into structured complaint summaries for the physician, served through Ollama's OpenAI-compatible API. The whole pipeline — data, training, serving, eval — runs on a single consumer GPU, so patient dialogues never leave the machine.
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Prototype for the tax return of the canton of Aargau: uploaded documents run through a hybrid OCR pipeline — PdfPig → Tesseract → Claude Vision — and the extracted values land directly in a faithful replica of the official form. A rule-based advisor suggests optimisations.
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Valuation models and research theses for twelve listed companies. Every figure is read at runtime from the official filing and checked twice — not a single actual value is typed by hand. Shared mechanics are separated from per-company judgement, and each workbook and PDF is rebuilt from scripts.
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Fixes and features shipped into projects I don't own:
| Project | Contribution | |
|---|---|---|
Dify  |
Type-safety pass across the MCP, plugin, agent-runtime and moderation layers; TypedDict migration for credential verification |
11 merged |
Webbrain  |
/export-with-traces command; site adapter for Galaxus |
2 merged |
WorldWideView  |
Three Cesium hot-path performance wins; ESLint baseline + CI lint job; dependency audit; architecture docs | 4 merged |
Scanpy (scverse)  |
min_cells parameter for dotplot |
open |
Excalidraw  |
Preserve text-editor focus on window blur (Alt+Tab) | open |
Infisical  |
PKI certificate-renewal response, distinct member counts, dotted secret references, project search filter, UI fix | 5 open |
Agno  |
N8nTools toolkit — n8n workflow automation for multi-agent systems |
open |
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Always up for a conversation about AI systems, automation, or open-source collaboration.
[email protected] · LinkedIn · Hugging Face · Kaggle
⭐ From AlsoTheZv3n