Michel Mohrmann

developer

Thallos Software

I bring over three decades of experience in software development, covering a wide spectrum of environments, systems, methods and philosophies that have come, gone or stayed over the years.

And still I am curious for more.

Since 2012, my passion is development for Apple platforms. Mainly iOS, iPadOS. But also macOS, watchOS and tvOS. Development focusing on Swift, SwiftUI, but coming from an Objective-C background.

Skills

fluent with

Java
^{5 years}

Spring Boot
^{5 years}

Relational Databases, SQL
^{> 20 years}

XCode
^{> 10 years}

Swift
^{7 years}

SwiftUI
^{5 years}

Objective C
^{> 10 years}

Core Data, SQLite
^{> 10 years}

AppKit, UIKit
^{> 10 years}

Cocoa
^{> 10 years}

UNIX-Shell
^{> 20 years}

Testing (XCTest)
^{6 years}

investigating

AI, Agentic Coding
Jetbrains Air
Junie, OpenCode, ClaudeCode, Codex

familiar with

PHP
^{> 10 years}
CakePHP
^{10 years}
git, Github, Gitlab
Java Messaging (SonicMQ)
Sentry, Firebase, Crashlytics
OpenAPI, Swagger
Scrum, Agile
SonarQube
CI, CD
UI Design
Jenkins
REST
API
HTML
JSON, XML
Hugo.io
Jekyll
Homebrew
Wordpress
React (AI supported)
many more…

tools

Jetbrains
Bruno
MAMP
Confluence, Jira
many more…

in earlier times

Progress OpenEdge ABL
^{> 20 years}
proALPHA
^{> 10 years}
Postman
CocoaPods
fastlane
HockeyApp, App Center
openHAB
Perl
Filemaker
ABAP
Sculptor

languages

German
^{Native speaker}
English
^{Very good}
French
^Basics

hobbies

Photography
Travel
Coding

Timeline

self employed

Thallos Software — Development Lead

June 1992 - Present -

Responsibilities include:

AquaCalculator - the number one App for enthusiatic reefer (iOS / macOS). Subscription based solution with a couple thousand active users and a few hundred positive feedbacks on the AppStore (adding up the older non-subscription based app and the new subscription based)
a self hosted CakePHP backend connected via a REST API to the AquaCalculator App
Aquarium Manager - Aquarium Manager is the combination of a tool for managing freshwater aquariums and aPedia - the comprehensive knowledge database for aquarists - an app (iOS / macOS / iPadOS, visionOS) with information on animals that you can keep in your aquarium. Developed to work with the AquaCalculator. Created entirely in Swift / SwiftUI. Includes an extensive management layer for collecting and enriching data via various REST APIs.
Photowunder / GPSFix - (iOS / macOS (Catalyst)). An App to help you fix your missing or false location data in your Photos Library.
some smaller apps active in the AppStore
the websites www.acalc.de, www.aquacalculator.com and www.thallos.de

Senior Software Developer (Development Lead)

senior (full-stack) developer at hagebau IT. Currently working on our customized proALPHA based ERP solution prohibis covering a wide range of not just technical topics. Windows based frontend. Linux database- / appserver.

Responsibilities include:

ERP expert with a wide range of topics: merchandise management, warehouse management, PIM, MDE, sales, purchasing, MIS, scheduling, fleet planning, etc.
since 2021 Lead developer for an internal in-house development covering all aspects of article master data and price management based on Java (Spring, Oracle, Kafka, (Rest)-APIs)
2014 technical management of the interface to the external warehouse management system pL-Store from proLogistik via SonicMQ
2012 Development Lead New MDE (Mobile Data Entry)
2011 API for external tour planning system Tourbo.route of Tourbosoft via SonicMQ
2011 prohibis b2b based on Webspeed / prohibis backend (https://shop.holzzentrum.de)
2009 hagebau / ZEUS Hazardous substances database (https://gwu.hagebau.com) based on Progress OpenEdge and Progress Webspeed
2008 Development hagebau topas for prohibis / ZART. Central article master for wholesale.
since 2003 Development of prohibis on the basis of proALPHA / integration of hagebau functions
2002 New development Web interface ZART (https://zart.hagebau.com) based on Progress Webspeed. Central interface for controlling article change services / article information system.
2001 New development ZART based on Progress OpenEdge ADM2. In-house solution for central article master data maintenance (ZART) Retail of the hagebau Group
1999 Development SAP / ABAP. Introduction SAP / customising / programming hagebau adjustments
1998 ERP hawis based on Sculptor (SCO Unix). Development of the hagebau ERP system for retail.
1996 ERP hibis based on Progress 4GL (Unix). Development of the hagebau ERP system for wholesage.

apprenticeship

Gruner + Jahr

August 1993 - February 1996 - Hamburg

some early contacts with the apple world but also some pc stuff.

Responsibilities include:

developing FileMaker seminar management app
for the canteen: tranfering a lotus 123 file recipe collection to a database
first contact with “the internet”

school

Fachgymnasium Wirtschaft in Soltau

September 1990 - July 1993 - Soltau

Abitur / Allgemeine Hochschulreife