united-domains AG
05/2022 — PresentPHP Software Engineer
- Feature development
- Project lead
- Database specialist
- PHP
- Symfony
- MySQL
- Docker
- Angular
- JavaScript
Freelance Senior Developer · Frankfurt am Main
Custom web applications, built, hosted and maintained in one place.
For businesses, schools and clubs that need software that fits but have no IT department of their own. Over 10 years of web development, faster through AI-assisted workflows. I also take over existing PHP systems and bring modern ways of working to teams.
Services
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Custom applications, hosting included
CRM, administration, booking, member portals. On top of the project price comes a monthly fee for hosting, updates, backups and monitoring, so there is nothing for you to look after.
Example The CRM of Schauspielschule Lila, built and running in production.
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Looking after existing PHP systems
Maintaining and extending existing applications, fixing bugs and bringing them up to current PHP versions.
Example Ongoing development of the PHP systems at united-domains, Shopware integrations at Liebscher & Bracht.
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AI-assisted development for teams
Introducing Claude Code and similar tools into development, review and documentation, with workshops and day-to-day support.
Example Own applications such as the CRM and Mietfux delivered in a fraction of the usual time.
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Servers, deployment & security
Docker infrastructure, automated deployment, protection with CrowdSec, versioned backups and monitoring, for anyone running their own servers.
Example Running several client sites on my own infrastructure, including Schauspielschule Lila and Hope for Children Kenya.
Projects
Client projects
Schauspielschule Lila
Web presence on a Netcup VServer using Docker, Traefik and CrowdSec.
- Docker
- Traefik
- CrowdSec
- Linux
CRM Schauspielschule
Custom CRM built with Symfony 6.4 & MariaDB 10, deployed by release tag on Netcup.
- Symfony 6.4
- PHP 8.4
- MariaDB 10
- Docker
Anumi Voting
Voting app for shared event rankings — a Flutter app with a Python backend and React admin.
- Flutter
- Python
- React
- Firebase
Hope for Children Kenya
Static nonprofit website built with Astro 5 & Tailwind CSS, served via Docker and Traefik.
- Astro 5
- Tailwind CSS
- Docker
- Traefik
Menü-Abstimmung
Menu voting for a wedding: guests enter a choice per person, the couple follow a live dashboard, and the organisers get a daily summary by email. Since retired, the code archived.
- Node 22
- Fastify
- SQLite
- Nodemailer
- Docker
Side projects
Mietfux
Rental management for room sublets, built with Symfony 7.4 & EasyAdmin 5 — including CSV-based bank reconciliation, automated rent postings and 2FA.
- Symfony 7.4
- PHP 8.4
- MariaDB
- EasyAdmin 5
- FrankenPHP
- Docker
Movie Voting Tool
Voting app for movie nights, built on Symfony 4.4 & MongoDB.
- Symfony 4.4
- MongoDB
Adventskalender
JavaScript advent calendar with mini games.
- JavaScript
- HTML
- CSS
Cimbria-Fidelitas Account-Tool
Finance management for club members, built with FastAPI & SQLite.
- FastAPI
- SQLite
- Docker
Reederei
Mobile business simulation about running a shipping company — Flutter & Flame with Riverpod, Drift and Firebase. "Reederei" is only a working title so far, not the final name.
- Flutter
- Flame
- Riverpod
- Drift
- Firebase
Raspberry Pi Backup
Versioned pull backups of the Netcup server onto a Raspberry Pi — an rsync mirror plus restic snapshots, monitored via Healthchecks.io.
- Raspberry Pi
- restic
- rsync
- Healthchecks.io
- Linux
Skills & Expertise
AI-FIRST
AI
- Level 4/5
- Level 4/5
Programming
- Level 5/5 · Core strengths
- Level 4/5
- Level 4/5
- Level 4/5
- Level 4/5
- Level 3/5
- Level 2/5
Frameworks
- Level 5/5 · Core strengths
- Level 4/5
- Level 3/5
- Level 3/5
- Level 3/5
- Level 3/5
- Level 2/5
Tools & Infrastructure
- Level 4/5
- Level 4/5
- Level 4/5
- Level 4/5
- Level 3/5
- Level 3/5
Languages
- Level 5/5 · Core strengths
- Level 4/5
Experience
Asuro GmbH
10/2021 — 04/2022Senior Symfony PHP Developer
- Project and team lead
- Greenfield REST API
- Symfony
- REST
- Docker
- PHP
Liebscher & Bracht Schmerzfrei GmbH
10/2020 — 09/2021Senior PHP Developer
- Building Shopware plugins to integrate 3rd-party software
- Project lead
- Shopware
- PHP
FormMed Healthcare AG
07/2020 — 10/2020PHP Developer
- Responsible for the Shopware application
- Point of contact for the Shopware agency
- Shopware
- PHP
LILLYDOO GmbH
10/2017 — 06/2020Senior Web Developer
- Frontend and backend development
- Database administration
- Feature and migration expert
- Sylius
- Symfony
- PHP
- MariaDB
- Docker
- MongoDB
- Vue.js
Sovendus GmbH
10/2015 — 09/2017Web Developer
- Game development in JS
- Laravel APIs, AngularJS, Vue.js
- JavaScript
- HTML
- CSS
- Laravel
- PHP
- AngularJS
- Vue.js
About me
For nearly a decade I have been building web applications focused on PHP and Symfony. My background is a bit unusual: before software I trained and worked as a chef — the discipline and craftsmanship from the kitchen still shape the way I build software. Across my career I have led migrations, piloted teams and shipped greenfield APIs.
Away from the computer I sail, play chess or go bouldering. When I am at it, projects of my own take shape alongside the day job — a rental management system, a CRM for a drama school, a small game. The same curiosity runs through all of it: whether new routes on the rock or new patterns in code.
10+ Years of experience
6 Positions
11 Own projects
Education & Training
Education
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IT Specialist – Application Development
Finish IT
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Computer Science (no degree)
Karlsruher Institut für Technologie (KIT)
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Chef apprenticeship
Conferences & Training
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betterCode(PHP) 2023 — "Turning sticky notes into software"
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SymfonyWorld Online 2021 — OOP & Design Patterns
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SymfonyCon Amsterdam 2019 — API Platform, Profiling PHP
Let's talk.
Frankfurt am Main Remote & hybrid in Rhine-Main Available from April 2027 Day rate on request
Email me mike@mike-gebert.de →