IT consulting

Erik Nellessen Consulting

Software architect and software developer based in Berlin

Specialized in java, electronic identities and cryptography. With my extensive experience concerning technologies and approaches, I’ll make your software project a success.

Project History

10/2023 – 12/2023 / Health Care Business / Design and implementation of a concept for balancing load in the load test of an EHEALTH Konnektor

04/2022 – 09/2023 / Public Administration / Development of a register for managing decisions concerning organ donations

01/2019 – 03/2022 / Health Care Business / Development of a test environment for an EHEALTH Konnektor

04/2018 – 12/2018 / IT security / Quality assurance of operating systems for Embededded Devices

10/2016 – 03/2018 / Health Care Business / Development of an EHEALTH card reader simulation

06/2014 – 05/2016 / Humboldt University of Berlin / Maintenance and development of the C++-, C- and Java project “eIDClientCore” / Source code

08/2012 – 10/2012 / IT security / Development of automated tests for an embedded device for securing connections in industrial environments


Programming languages: Java, C, Python, C++, Typescript

Build systems: Maven, Gradle, CMake, npm

Tools, libraries and protocols: IntelliJ IDEA, Spring Boot, Angular, REST, Jira, Confluence, Git, GitLab, GitLab CI, Debian Linux, Jenkins CI, SonarQube, Smartcards, Docker, JavaFX


Organizational: SCRUM, Kanban, SAFe

Technical: Test-driven development (TDD), continuous integration (CI), static code analysis


03/2020 Professional SCRUM Product Owner I

02/2020 iSAQB® Certified Professional for Software Architecture Foundation Level


2014 – 2016 / Master of Science in Computer Science / Humboldt University of Berlin / Master thesis / Source code for master thesis: encrypting-cloud-storages user-controlled-decryption-operations / Android app from master thesis

2011 – 2014 / Bachelor of Science in Computer Science / Humboldt University of Berlin / Bachelor thesis / Source code for bachelor thesis

2008 – 2011 / Apprenticeship Chemistry Laboratory Assistant / Henkel AG & Co. KGaA / Düsseldorf




Docker Hub



OpenPGP key:

QR code of my OpenPGP fingerprint