What I offer
-
Legacy modernization
I bring grown systems safely onto current technology — incrementally,
test-covered, without drama in production.
-
Interim CTO & technical leadership
Strategic technical responsibility, board-level reporting, hiring and
mentoring — for exactly as long as you need it.
-
Hands-on development
Ruby on Rails, Elixir & Phoenix, done well: architecture, data
modeling, APIs, tests.
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DevOps, infrastructure & hosting
Containers, CI/CD, infrastructure as code, Linux — from bare metal to
cloud.
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Team coaching & developer productivity
Pair programming, TDD, agile processes that fit — teams that ship
more, with more joy.
Background
- 2+ years
- Elixir · Ash · Phoenix · Typescript · Python · AI tools
- 20+ years
- Team leadership · Agile development · Ruby on Rails · Javascript
- 25+ years
- Web development · Hosting · SaaS · Marketplaces · E-commerce · Payment · APIs · CMS
- 28+ years
- Software engineering · Consulting · Coaching · Databases · Linux server administration
Selected projects
OvulaRing — VivoSensMedical GmbH, Leipzig
since 2022
Senior Ruby & Linux/DevOps consultant: modernizing the entire
legacy platform — mobile API and web apps — from its 2014 state to
current technology. Rails 3 → 7, containerized development
and deployment with Nomad, infrastructure as code, a much simpler
system architecture — removing deployment downtime, and greatly reducing hosting costs.
Ruby on Rails · MongoDB · Hotwire · Docker · Nomad · Ansible
florio HAEMO — Die Produktmacher / SOBI, Munich
2021 – 2022
Lead developer of a web application physicians use to record
hemophilia treatment data and report it to the German Hemophilia
Register. Technical lead of a team of 4–6, design of architecture and
data model, critical components such as a SOAP API client with 2FA —
under medical-device standards ISO 13485 and ISO 27000.
Ruby on Rails · PostgreSQL · Hotwire · JSON & SOAP APIs
Wimdu — Berlin / Lisbon
2015 – 2018
From senior Rails developer to technical product manager to interim
CTO at what was then Europe's leading vacation-rental marketplace.
Technical leadership for up to 25 developers, the transition from a
monolith to service-based architecture, payment integrations in
multiple currencies, GDPR and KYC compliance.
Ruby on Rails · ElasticSearch · Redis · AWS
Detailed CV and references available on request.
Rates
€185
per hour
€1,450
per day
Long-term engagements: rates negotiable.
The first day is a trial day: we work on your real tasks — you decide
afterwards.
Book a first day
Why work with me
Because you need a versatile, experienced, communicative engineer with
out-of-the-box ideas on your team.
Because you have deadlines to meet — and I can help your team
accelerate.
Because I've got taste: I recognize good design, and I can fix a bad
one. I care about the details that matter.
Because I love what I do — which makes me surprisingly efficient.
Because I believe in getting things done well and thoroughly:
test-driven and explorative programming are both valuable tools.
And finally: because people who've worked with me loved it.
Clients from many industries
- BMW
- Otto
- tesa
- Novartis
- Wella
- Metten Stein+Design
- VivoSensMedical
- DistriSmart / Papersmart
- Waldkonzepte
- evergreening landschaftsarchitekten
- Kirchner Musikmanagement
- Fachhochschule Magdeburg