Peter Großmann - Senior Backend Developer for Microservices

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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 WBCI pre-coordination workflow
Conducting unit, integration, and acceptance tests with business units
Setting up CI/CD pipelines
Troubleshooting support tickets
Performing major refactorings of legacy code to adapt to new microservices
Participating 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 functions and data structures of a legacy application
Gathering customer requirements and aligning interfaces
UI design in collaboration with the customer
Development of Spring Boot backend and React frontend
Conducting unit and integration tests
Project setup including CI pipeline and required dependencies
Designing the architecture, data models, services, and REST interfaces
Migrating legacy data from Oracle to PostgreSQL
Code reviews and regular customer meetings
Implementing 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

Member of the Scrum order management team
Analysis and resolution of errors in Camunda processes using Kibana and PIS GUI
Finding solutions through communication with various teams
Extending and modeling processes
Code reviews and refactoring of legacy code
Conducting unit and integration tests
Implementing asynchronous services with Kafka
Optimizing slow database queries and partitioning tables
Migrating services into 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

Member of a Scrum team
Extending and fixing issues in FeedForward (employee feedback) and OBI absence workflow (vacation planner)
Migrating services into Kubernetes clusters
Conducting 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

Member of a Scrum team
Extending and fixing issues in EMF, a tool for StoB application management according to BEMFV
Code reviews and conducting unit and integration tests
Gathering new customer requirements in regular meetings
Deployments on 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 clients
Creating architecture documentation according to Arc42
Leading a team of developers (3 developers)
Gathering client requirements
Developing a Spring Boot backend and Angular frontend
Code reviews
Performing 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 check
Generating PDFs
Code reviews and performing unit and integration tests
Leading a team of developers (3 developers)
Maintaining and extending 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 client requirements and coordinating the design
Performing unit tests
Integrating and extending an existing PHP backend
Maintaining and extending the app
Leading a team of developers (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 geocoordinates, geofencing, visited websites, and used apps
Implementing the JEE backend
Performing unit tests
Leading a team of developers (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

Maintaining a learning management system
Extending group management and implementing email notifications
Assigning 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)

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

Jan 2012 - Sep 2020

8 years 9 months

Lead Developer

Lyncker & Theis GmbH

Led a team of developers (about 5 on average)
Developed the backend for the Brainyoo learning software (JEE monolith)
Created front-ends with JSF and the shop with Magento
Performed unit and integration tests
Requirements analysis and effort estimation
Contributed to the Android app
Server administration (SuSe) and set up CI pipelines
White-label solutions and branding for multiple clients
Mentored 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

Developed and maintained a digital asset manager
Converted e-books to SWF and extracted metadata and texts
Built a webshop 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)

Other skills

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

Other skills (projects / personal activities)

Development and operation of the website cardano-tools.io
Development and operation of the website charly-token.io
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
Familiarizing with unfamiliar code

Weaknesses

The Apple ecosystem
C
C++
C#
Tend to get lost in details

Languages

German

Native

English

Advanced

Education

Aug 2004 - Nov 2009

Hochschule RheinMain

Diploma in Computer Science · Computer Science · Wiesbaden, Germany

Aug 2002 - Jun 2004

Berufliche Schulen Untertaunus

Advanced technical college entrance qualification in Information Technology · Information Technology · Taunusstein, Germany

Aug 1996 - Jun 2002

Theißtalschule

Secondary school certificate · 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

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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 Vodafone / Deutsche Funkturm.

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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<€800 €800-1200 €1200-1600 €1600+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Average rates for similar positions

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Daily rate avg. 933 €

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

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750

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Median rate 928 €

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 10 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.