CV

Personal Link to heading

Full name: Roman Patrick Zimmer
Born: 28th of August 1984 in Berlin
Languages: German, English, Spanish
Location: D-10245 Berlin
E-mail: hello@roman-zimmer.app

Technologies (selection) Link to heading

Android Link to heading

Kotlin & reactive programming (RxJava, Coroutines, etc.): ★★★☆
UI (Material Components, Jetpack Compose, etc.): ★★★☆
Standard libraries (Jetpack, Dagger, Retrofit, etc.): ★★★★

Frontend Link to heading

JavaScript web application (AngularJS, Angular, React, etc.): ★★★☆
HTML5 & CSS3 (Bootstrap, Material-UI, etc.): ★★★☆

Backend Link to heading

Servlet-based (Spring Boot, Jetty, etc.): ★★★☆
Event-based (nest, Express, etc.): ★★★☆
PHP-based (Laravel, TYPO3 FLOW, etc.): ★★★☆
Databases (MariaDB/MySQL, ElasticSearch, etc.): ★★★☆

Tooling Link to heading

DevOps (AWS, Serverless, Docker, virtualization, Linux administration, Ansible, etc.): ★★★☆
Build management/CI (Maven, Gradle, Jenkins, CircleCI, Travis CI, etc.): ★★★★
Code versioning (Git, GitHub, GitLab, etc.): ★★★★
Issue tracking (Jira, Redmine, etc.): ★★★★

Certifications Link to heading

Security Champion: Expert for secure software development (certified by Fraunhofer IEM)

Projects (selection, anonymized) Link to heading

Commercial Link to heading

get off my couch

Location recommendation app

Technical Lead Developer responsible for architecture, business logic & UI
Android with Kotlin (phone & tablet)
February 2017 - present

B******* b**G*_App

Highly modularized & customizable health insurance app framework

Senior Android Developer responsible for implementing new features & improving the CI/CD process
Android with Kotlin (phone)
April 2022 - present

A** Bonus-App

Health insurance app to get rewards by analysing fitness data

Senior Android Developer responsible for implementing new features & a redesigned UI
Android with Kotlin (phone)
August 2019 - March 2022

F*******

Online marketplace for raw wood

Lead Backend Developer responsible for architecture & business logic
NestJS, MySQL
May 2019 - August 2019

D******* P*** P***********

Stamp product finder of a big German mail company

Lead Backend Developer responsible for architecture & business logic
Spring Boot, MySQL
January 2019 - May 2019

Purple

E-publishing software

Backend Developer responsible for implementing publication indexing & search microservices
Spring Boot with Kotlin, ElasticSearch
April 2018 - May 2018

B*** S**** L*********

Moderated Slack conversation publishing

Technical Co-Lead Developer responsible for architecture, business logic, UI & DevOps
AngularJS with Bootstrap & Node.js, AWS, Serverless
August 2017 - June 2018

D****** N*****

Research tool

Technical Team Lead Developer responsible for architecture, business logic & UI
Eclipse RCP
October 2016 - June 2017

C****** N*******

Digital news app

Android Developer responsible for implementing features & optimizing UI
Android (phone & tablet)
August 2016 - September 2016

g***

Berliner Mietzuschuss online submission form

Backend Developer responsible for implementing features, UI & DevOps
Spring Web
February 2016 - July 2016

M******* S*** F*********

Campaigner app

Technical Co-Lead Developer responsible for architecture, business logic, UI & DevOps
Android (tablet) with web application based on AngularJS & Spring Boot
October 2015 - January 2016

D** W**** E******

Digital newspaper app for tablets

Android Developer responsible for implementing features & UI
Android (tablet)
May 2015 - November 2015

h****

Video messenger app

Android Lead Developer responsible for implementing features & UI
Android (phone)
August 2014 - May 2015

T-S****** D****

Digital learning platform for students

Android & Backend Developer responsible for implementing features & UI
Android (phone & tablet), Spring Web
January 2014 - May 2014

tripventure

AR-based educational gaming engine & platform

Backend & Lead Android Developer responsible for implementing features & UI
Android (phone) & Spring Web
March 2011 - November 2013

Meetups Link to heading

Cocktails & Code // Mobil mit Barrieren

Talk with live demo about how to write accessible apps under Android (in German)

Technical speaker
Android
October 2020

Articles Link to heading

Barrierefreiheit: Stolpersteine bei mobilen Anwendungen überwinden, Teil 2

Technical article about writing accessible apps under Android for heise developer (in German)

Technical writer
Android
August 2019

Open Source Link to heading

xar

Library for reading and writing eXtensible ARchiver files

Former Main Developer
Java
May 2016 - July 2018

TextureVideoView

VideoView using a TextureView instead of a SurfaceView

Former Main Developer
Android
May 2014 - July 2017

Work Link to heading

Senior Software Engineer: adesso mobile solutions GmbH, Berlin, January 2019 - present
Senior Software Developer: sprylab technologies GmbH, Berlin, April 2011 - November 2018
TYPO3 lecturer: TU Berlin and Volkshochschule Berlin, January 2008 - present
Junior Software Developer: sprylab technologies GmbH, Berlin, May 2009 - March 2011
TYPO3 technical support: TU Berlin, August 2007 - July 2008

Education Link to heading

University degree: Diplom in Computer Science, TU Berlin, February 2011
Study abroad: Universidad Politécnica de Valencia, September 2006 - March 2007
School degree: Bilingual (German-Spanish) Abitur, Friedrich-Engels-Gymnasium, June 2003