Web Developer & AI Engineer
Full-stack web development with Next.js and Node.js — and clean integration of AI and third-party APIs. Most recently an AI phone assistant that picks up, understands the request and books the table while the caller is still speaking.
Schleswig, Germany · Remote
All of it over one open WebSocket connection, both directions at once.
Main project
cileria GmbH · 06/2026 — 07/2026
AI phone assistant for restaurant reservations
A restaurant misses calls while service is running. Kanchi takes them instead: the assistant works out the date, time and party size during the conversation, checks which tables are free and enters the reservation. In German and English.
Twilio media streams over WebSocket, Deepgram for transcription, OpenAI with function calling for the booking logic, ElevenLabs for the reply. Plus inactivity timers, rate limiting and a bounded queue, so a conversation survives a load spike.
An algorithm I wrote that assigns reservations to tables and zones automatically — so more guests fit into the evening than with manual seating.
Next.js App Router, React and Tailwind: call log, analytics with Recharts, an interactive floor plan with drag and drop, voice assistant configuration, opening hours and exceptions. Bilingual, with dark mode.
Express and TypeScript on PostgreSQL. Schema design, a migration runner I wrote for idempotent migrations, multi-tenant architecture, REST API and WebSockets. Unit tests for the agent, reservations, rate limiting and the privacy notice.
NextAuth with JWT, email verification, password reset and an approval workflow. Callers hear a privacy notice at the start; conversations are not recorded.
Docker and Docker Compose, GitLab CI/CD from lint through build to deploy, nginx as a reverse proxy on our own Linux server, migrations against the production database.
Company project at cileria GmbH. What I built is described here.
Other work
Smaller projects, each with a technical challenge of its own. Where the code is public, the link is there.
Mobile app
Voice notes for your phone: record it, have it transcribed, and the AI pulls out what matters. Expo and React Native on the front, Express and PostgreSQL behind it. The API address is derived from the Expo dev host automatically, so a real device on the same Wi-Fi works without configuration.
Prototype, not released yet
Data pipeline
Collects content from Reddit, YouTube and Hacker News through one shared data-source interface, stores it raw and normalised in PostgreSQL, and starts runs on a schedule. Includes written research on why classic RAG was the wrong answer here.
Private repository
Final project, team of three
A searchable catalogue of Maldivian marine life with sightings per atoll, user accounts and favourites. Built by three of us; my part was the backend: Express and Sequelize on PostgreSQL, auth, image upload with sharp, rate limiting. The frontend speaks six languages.
Full-stack
A small forum with registration, cookie sessions, bcrypt hashing, posts, comments and lockable threads. PostgreSQL straight through SQL, no ORM — it came out of the database course and was meant to show that.
Frontend
A notes list in the browser, stored locally. The interesting part was reordering by drag and drop: written from scratch, because it had to work equally well with a mouse and a finger — including auto-scroll when you drag towards the edge of the screen.
Tools
Sorted by job, not by preference. Everything here has gone into a project someone actually used.
Background
I learned audio before I learned code. Signal paths, latency, levels — the vocabulary stayed the same, it's just speech running through the chain now instead of music. That's also where this page's design comes from.
06/2026 — 07/2026
cileria GmbH · Remote
Built Kanchi — frontend, API and real-time voice integration through to Docker deployment and CI/CD.
06/2025 — present
DCI Digital Career Institute · Remote
A one-year full-time programme in the MERN stack, finished with a team project.
08/2019 — 03/2025
Wayfair · Remote
Five and a half years of customer service and sales in e-commerce. Returns, complaints, replacements — and daily practice at understanding a problem before solving it.
10/2012 — 04/2014
Akademie Deutsche POP · Hanover
Training in audio, beat and music design: Pro Tools, Logic, sound design, sampling, music production.
Contact
I'm looking for a web developer role with an AI angle — employed or per project, remote or in northern Germany. An email is enough; I usually reply the same day.
Send an email: simon.woebke@gmx.de