Peter Großmann - Senior Java Backend Developer, Spring

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Wiesbaden, Germany

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Experience

Mar 2024 - Jul 2025

1 year 5 months

Senior Backend Developer

NetCom BW GmbH

Development of microservices according to the TMF standard
Adaptation of existing workflows to microservices (PNMGT, RADIUS, WBCI, ACS, VOIP, P2P)
Migration of communication from RabbitMQ/REST to Kafka
Development of Camunda processes for billing leased infrastructure
Implementation of Kafka connectors for billing and inventory data systems
Automation of the workflow for WBCI preliminary coordination
Execution of unit and integration tests as well as acceptance tests with the business departments
Setup of CI/CD pipelines
Error analysis for support tickets
Execution of larger refactorings of legacy code to adapt it to new microservices
Participation in meetings to gather and clarify requirements
Technologies: Kubernetes, AWS-DevOps, Apache Camel, Debezium, Python, TMF, Confluent, Kafka, OpenAPI, Java 21, Spring Boot, Docker, MapStruct, PostgreSQL, Maven, Camunda, Keycloak

Jan 2023 - Jan 2024

1 year 1 month

Senior Fullstack Developer

Deutsche Funkturm

Analysis of the functions and data structures of a legacy application
Gathering customer requirements and coordinating interfaces
UI design in consultation with the customer
Development of Spring Boot backend and React frontend
Execution of unit and integration tests
Project setup including CI pipeline and required dependencies
Design of the architecture, data models, services and REST interfaces
Migration of legacy data from Oracle to PostgreSQL
Code reviews and regular customer meetings
Implementation of authentication with Keycloak and Spring Security
Application go-live
Technologies: Java 17, Spring Boot 3, PostgreSQL 11, Hibernate, Liquibase, MapStruct, REST, OpenAPI, React, TypeScript, nx, MUI, Docker, GitLab, Jira, Confluence, Cloud-native, jUnit, Jest, Cypress, Maven

Oct 2021 - Dec 2022

1 year 3 months

Senior Backend Developer

1&1 Internet AG

Collaboration in the Scrum team Order Management
Analysis and resolution of errors in Camunda processes using Kibana and PIS-GUI
Finding solutions through communication with various teams
Extension and modeling of processes
Code reviews and refactoring of legacy code
Execution of unit and integration tests
Implementation of asynchronous services with Kafka
Optimization of slow database queries and partitioning of tables
Migration of services to Kubernetes clusters
Technologies: Java 11, JEE, Camunda, PostgreSQL, REST, Jenkins, Kibana, Signavio, Camunda Modeler, Kubernetes, Jira, Confluence, jUnit, Maven, Kafka

Apr 2021 - Mar 2022

1 year

Senior Fullstack Developer

OBI E-Commerce GmbH

Collaboration in a Scrum team
Extension and bug fixing of FeedForward (employee feedback) and the OBI absence workflow (vacation planner)
Migration of services to Kubernetes clusters
Execution of unit and integration tests
Code reviews
Technologies: Java 11, Spring Boot, Angular 10, Angular Material, REST, TypeScript, PostgreSQL, GitLab, Jira, Confluence, jUnit, Jasmine, Gradle

Oct 2020 - Sep 2021

1 year

Senior Developer

Vodafone / Deutsche Funkturm

Collaboration in a Scrum team
Extension and bug fixing of EMF, a tool for managing StoB applications according to BEMFV
Code reviews and execution of unit and integration tests
Gathering new customer requirements in regular meetings
Deployments at the customer's site
Communication and meetings with IBM to connect EMF to IBM TRIRIGA
Technologies: Java, Spring Boot, JSF, Oracle Database, REST, Hibernate, Docker, Selenium, GitLab, OpenAPI, Jira, Confluence, jUnit, Maven

Mar 2020 - Sep 2020

7 months

Lead Developer

Compertis mbH

Planning and development of an application for secure file exchange with customers
Creation of architecture documentation according to Arc42
Management of a development team (3 developers)
Gathering customer requirements
Development of a Spring Boot backend and Angular frontend
Code reviews
Execution of unit and integration tests
Technologies: Java 11, Spring Boot, Angular, Angular Material, REST, TypeScript, PostgreSQL, Hibernate, Docker, Selenium, GitLab, OpenAPI, Jira, Confluence, Cloud-native, jUnit, Jasmine, Gradle

Mar 2019 - Jan 2024

4 years 11 months

Lead Developer

R+V Versicherung

Development of an Angular SPA for documenting a suitability and appropriateness assessment
PDF generation
Code reviews and execution of unit and integration tests
Management of a development team (3 developers)
Maintenance and enhancement of the application since January 2024
Technologies: Angular, Angular Material, TypeScript, Bitbucket, Jira, Confluence, Jasmine

Feb 2018 - Jul 2020

2 years 6 months

Lead Developer

LAUSCHTOUR - Audioguides & Apps

Development of an Android app for a museum audio guide
Automatic synchronization of content with the backend
Gathering customer requirements and coordinating the design
Execution of unit tests
Integration and enhancement of an existing PHP backend
Maintenance and enhancement of the app
Management of a development team (2 developers)
Technologies: Android SDK, Symfony, PHP, Bitbucket, Jira, REST, Confluence, jUnit, MySQL

Dec 2014 - Apr 2015

5 months

Developer

IFAK Institut GmbH & Co. KG

Development of a tracking module for an existing app
Recording of geocoordinates, geofencing, visited websites, and used apps
Implementation of the JEE backend
Execution of unit tests
Management of a development team (2 developers)
Code reviews
Technologies: Android, REST, JEE, JSF, Hibernate, Spring, Maven, jUnit, Bootstrap, PostgreSQL

Jan 2013 - Sep 2020

7 years 9 months

Fullstack Developer

Learnbit GmbH

Maintenance of a Learning Management System
Enhancement of group management and implementation of email notifications
Assignment of courses by region
Technologies: JEE, JSP, WBT format, Spring, Hibernate, MySQL, SVN, Track, jUnit, Maven

Sep 2012 - Dec 2012

4 months

Backend Developer

Verbundzentrale des GBV (VZG)

Development of a command-line application to import the union catalog from an XML interface into a Solr server
Configuration of the Solr schema
Technologies: Java 7, Apache Xerces, Solr, Lucene, Maven

Jan 2012 - Sep 2020

8 years 9 months

Lead Developer

Lyncker & Theis GmbH

Management of a development team (5 developers on average)
Development of the backend for the Brainyoo learning software (JEE monolith)
Development of the frontends with JSF and the shop with Magento
Execution of unit and integration tests
Requirements analysis and effort estimates
Contribution to the Android app
Administration of servers (SuSe) and setup of CI pipelines
White-label solutions and branding for several customers
Tutor for junior developers
Refactoring and code reviews
Technologies: Java, JEE, JSF, Spring, Hibernate, REST, PostgreSQL, MySQL, Maven, Docker, PHP, CSS, Bitbucket, Jenkins, Jira, Magento, jUnit, Selenium

Feb 2010 - Dec 2011

1 year 11 months

Junior Fullstack Developer

juni.com - mehr Multimedia

Development and maintenance of a digital asset manager
Conversion of e-books to SWF and extraction of metadata and text
Development of an online shop for Duncker & Humblot Verlag
Technologies: Java, PHP, PDFlib, ePub, MySQL, Magento, JavaScript

Industry experience

See where this freelancer has spent most of their professional time.

Experienced in Education, Insurance, Telecommunication, Tourism, Information Technology, and Media and Entertainment.

Education

Insurance

Telecommunication

Tourism

Information Technology

Media and Entertainment

Business area experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Product Development, and Quality Assurance.

Information Technology

Product Development

Quality Assurance

Summary

Backend

Java (8–21)
Spring Boot
REST
Python
OpenAPI
Swagger
TMF

Frontend

Angular
Angular Material
React
MUI
JSF
PrimeFaces
Next.js
daisyUI
TypeScript
Tailwind
CSS

Databases

PostgreSQL
MySQL
MongoDB

DevOps / CI/CD

Docker
Docker Compose
Kubernetes
Jenkins
GitLab
GitHub
Azure DevOps
SonarQube

Cloud / Auth

OAuth
KeyCloak
Spring Security
Azure

Tests

jUnit
mockito
JaCoCo
Cypress
Selenium
Jasmine
Karma
Istanbul
unittest (Python)

Additional Skills

Apache Camel
MapStruct
Debezium
Camunda
Kafka
Liquibase
Maven
Gradle
WebSockets
Solr
Lucene
Arc42
TensorFlow
DL4J
PHP
Android SDK
Magento
Symfony
OpenStreetmap
Jira
Confluence

Additional Skills (Projects / Personal Activities)

Development and operation of the cardano-tools.io website
Development and operation of the charly-token.io website
Operation of a Cardano staking pool
Development and operation of the backend for portal.themandrillz.io
OpenStreetmap
Websockets
Python (Crawler / Tensorflow)
DL4J

General Strengths

Patience
Debugging
Optimizing SQL queries
Problem-solving
Code reviews
Getting familiar with unfamiliar code

Weaknesses

The Apple world
C
C++
C#
I tend to get lost in details

Languages

German

Native

English

Advanced

Education

Aug 2004 - Nov 2009

Hochschule RheinMain

Diplom-Informatiker · Computer Science · Wiesbaden, Germany

Aug 2002 - Jun 2004

Berufliche Schulen Untertaunus

Fachabitur im Bereich Informationstechnik · Information Technology · Taunusstein, Germany

Aug 1996 - Jun 2002

Theißtalschule

Mittlere Reife · Niedernhausen, Germany

...and 1 more

Certifications & licenses

Statistics

Experience

Total positions 13

Experience in Education 8.5 y

Avg length 2 y 5 m

Longest experience 8 y 8 m

Expertise

Recent roles Senior Backend Developer, Senior Fullstack Developer, Senior Developer

Main industries Education, Insurance, Telecommunication

Main business areas Information Technology, Product Development, Quality Assurance

Qualifications

Certifications earned 1

Profile

Member since

October 2025

Last update

October 2026

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Frequently asked questions

Have questions? Find more information here.

Peter is based in Wiesbaden, Germany and can operate in on-site, hybrid, and remote work models.

Peter speaks the following languages: German (Native), English (Advanced).

Peter has at least 15 years of experience. During this time, Peter has worked in at least 8 different roles and for 13 different companies. The average length of individual experience is 1 year and 2 months. Note that Peter may not have shared all experience and actually has more experience.

Based on recent experience, Peter would be well-suited for roles such as: Senior Backend Developer, Senior Fullstack Developer, Senior Developer.

Peter's most recent position is Senior Backend Developer at NetCom BW GmbH.

In recent years, Peter has worked for NetCom BW GmbH, Deutsche Funkturm, 1&1 Internet AG, OBI E-Commerce GmbH, and R+V Versicherung.

Peter is most experienced in industries like Education, Insurance, and Telecommunication. Peter also has some experience in Tourism, Information Technology, and Media and Entertainment.

Peter is most experienced in business areas like Information Technology, Product Development, and Quality Assurance.

Peter has recently worked in industries like Insurance, Telecommunication, and Information Technology.

Peter has recently worked in business areas like Information Technology, Quality Assurance, and Product Development.

Peter attended Hochschule RheinMain for Computer Science.

Peter has 1 certificate: iSAQB® Certified Professional For Software Architecture – Foundation Level.

The availability of Peter needs to be confirmed.

Daily rate distribution

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Average rates for similar positions

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Daily rate avg. 960 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

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Median rate 880 €

The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.

Calculated based on our freelancers’ daily rates as of 20 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.