About me

This page is a bit of background about me.

I’m a full-stack developer currently living in Tokyo and studying Japanese. Most of this website is about my life here and the blog I want to build around that experience, but if you’re curious about my professional background, this page also includes my CV, experience, skills, and education.

Experience

Joh. Berenberg, Gossler & Co. KG

Full‑Stack Engineer Hamburg, Germany
November 2024 - March 2026

Technologies used

  • React
  • Git
  • Bitbucket
  • Java
  • Quarkus
  • Docker
  • Kubernetes
  • TypeScript
  • JavaScript
  • WildFly
  • PL/SQL
  • Subversion

Developed and automated Corporate Actions processes. Company language: German.

HanseCom Public Transport Ticketing Solutions GmbH

Backend Java Developer Hamburg, Germany
September 2024 - November 2024

Technologies used

  • Spring Boot
  • Git
  • Microservices
  • Gitlab
  • Gradle
  • PostgreSQL
  • Kubernetes
  • Docker
  • Java

Developed ticketing systems. Company languages: English/German.

SDA SE Open Industry Solutions

Full‑Stack Engineer Hamburg, Germany
November 2022 - August 2024

Technologies used

  • Go
  • Spring Boot
  • React
  • Kafka
  • Gradle
  • MongoDB
  • Docker
  • Kubernetes
  • Java
  • TypeScript
  • GitHub
  • Jenkins
  • Dropwizard
  • GitOps
  • Microservices

Built malware scanner services, an Operational Data Store (ODS), and a connector for the German electronic health record (ePA). Company language: English.

Joh. Berenberg, Gossler & Co. KG

Full‑Stack Engineer Hamburg, Germany
January 2019 - October 2022

Technologies used

  • React
  • Git
  • Java
  • Quarkus
  • Docker
  • Kubernetes
  • TypeScript
  • JavaScript
  • WildFly
  • PL/SQL
  • Subversion

Developed and automated Corporate Actions processes. Company language: German.

Joh. Berenberg, Gossler & Co. KG

Working student Hamburg, Germany
March 2018 - December 2018

Hytera Mobilfunk GmbH

Working student Flensburg, Schleswig-Holstein, Germany
May 2016 - February 2018

Technologies used

  • Git
  • Node.js
  • AngularJS
  • C++
  • Qt
  • CouchDB
  • MQTT
  • JavaScript

Contributed to test automation. Company language: German.

DF Automotive GmbH

Working student Flensburg, Schleswig-Holstein, Germany
August 2014 - February 2015

Technologies used

  • PHP
  • CSS
  • HTML
  • MySQL
  • JavaScript
  • Subversion

Contributed to an item management system for the online shop. Company language: German.

Education

ALA Academy of Language Arts

Japanese Language Course No.2 Tobundo BLDG., 2-16 Ageba-cho, Shinjuku-ku, Tokyo, Japan
April 2026 - March 2027

Hochschule Flensburg

Applied Computer Science (BSc) Flensburg, Schleswig-Holstein, Germany
September 2014 - January 2019

Gorch-Fock-Schule

Lower secondary school certificate Kappeln, Schleswig-Holstein, Germany
September 2005 - June 2010

BBZ Kappeln

Intermediate school‑leaving certificate Kappeln, Schleswig-Holstein, Germany
August 2010 - June 2012

Eckener-Schule

University of Applied Sciences entrance qualification Flensburg, Schleswig-Holstein, Germany
August 2012 - July 2014

Skills

Technologies

  • AngularJS

    Advanced Beginner

  • Bitbucket

    Competent

  • C++

    Advanced Beginner

  • CSS

    Proficient

  • CouchDB

    Beginner

  • Docker

    Proficient

  • Dropwizard

    Competent

  • Git

    Expert

  • GitHub

    Competent

  • GitOps

    Competent

  • Gitlab

    Beginner

  • Go

    Advanced Beginner

  • Gradle

    Competent

  • HTML

    Expert

  • Java

    Expert

  • JavaScript

    Competent

  • Jenkins

    Competent

  • Kafka

    Competent

  • Kubernetes

    Proficient

  • MQTT

    Beginner

  • Microservices

    Competent

  • MongoDB

    Competent

  • MySQL

    Competent

  • Node.js

    Advanced Beginner

  • PHP

    Advanced Beginner

  • PL/SQL

    Competent

  • PostgreSQL

    Competent

  • Qt

    Advanced Beginner

  • Quarkus

    Expert

  • React

    Expert

  • Spring Boot

    Competent

  • Subversion

    Advanced Beginner

  • TypeScript

    Expert

  • WildFly

    Competent

Languages

  • German

    Native

  • English

    Business‑fluent

  • Japanese

    Intermediate

Contact

Feel free to reach out via email at mathieu@kellerlab.dev or connect through social media.