Jens B. - Senior Fullstack Developer

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Mannheim, Germany

Experience

Jul 2025 - Present

5 months

Mannheim, Germany

Executive Board Consultant

PLOIN GmbH

Supporting executive management in the transformation process to a mid-sized company regarding technical infrastructure
Promoting the professional development of working students, junior developers, etc.
Developing and (technically) implementing new processes
Contributing to corporate strategy (medium- and long-term strategic planning)
Collaborating on defining units and functions within the company and supporting the upscaling of individual areas (technical, organizational)
Assisting in selecting technologies, software, infrastructure, etc.
Developer role for automating standard processes, linking application areas, creating forms, etc.
Personal training in technologies like React, TypeScript, Thymeleaf, Docker, etc.

May 2021 - Jun 2025

4 years 2 months

Senior Developer / Lead Developer

Commerzbank AG

Taking over and further developing an existing React.js prototype
Setting up a Maven project to integrate the frontend into CI/CD
Deploying the frontend to the cloud via OpenShift (Kubernetes)
Conceptual work on the overall architecture and deployment process
Planning new versions and the migration process, including scheduling
Leading development of the new version based on the current Java framework
Coordinating with framework specialists
Operating and supporting a central participant management tool
Enhancing existing applications in collaboration with the project team
Tools and technologies used: React, Java, Node, NPM, Spring, OAuth, Next.js, Maven, OpenShift, S2I, OC-CLI, Bitbucket, Nexus, GitHub, Eclipse IDE, Visual Studio IDE, YAML, REST APIs, OpenShift Maven Plugin, Sonatype CLM Maven Plugin, Java, JSF/PrimeFaces, Spring Framework, Hibernate, JPA, Maven, JUnit, EasyMock, Swagger UI, TeamCity, SonarQube, Sonatype CLM, IBM z/OS, Tomcat, WebSphere, Eclipse IDE

Jan 2020 - Apr 2021

1 year 4 months

Senior Developer

Infiltec GmbH

Creating an online product configurator for commercial customers
Frontend and backend development
Tools and technologies used: React, Next.js, Vue.js, JavaScript, HTML5, CSS, Sass, jQuery, Thymeleaf, Java EE, Spring Boot, Lombok, iText, Maven, Gradle, Liquibase, H2 DB, Apache Tomcat, Eclipse, Ubuntu/Linux

Nov 2018 - Dec 2019

1 year 2 months

Lead Development

ITZBund / Materna

Team lead and coach for the development team
Liaison between project management and development team
Designing and developing critical and new complex parts of the application
Tools and technologies used: Java EE, JSF, PrimeFaces, OmniFaces, Spring Boot, Weld, CDI, JPA, Hibernate, MapStruct, Camunda, Solr, iText, PDFBox, Jackson, Log4j, CORS filter, WebSockets, Oracle DB, H2 DB, SQL, SharePoint, SOAP, REST, XML, SAXParser, Maven, JUnit, Mockito, Arquillian, Selenium, Jenkins, GitHub, Jira, Scrum, JBoss, IntelliJ IDEA, JavaScript, jQuery, HTML5, SAML

Mar 2018 - Aug 2018

6 months

Requirements Engineer, Developer

INTER Versicherungsgruppe

Creating and documenting test suites
Close collaboration with group leader and senior developer
Developing adapters for systems needed for test environments
Drafting test cases in collaboration with the testing department and business contacts
Documenting in UML
Tools and technologies used: Java, Spring Boot, Spring Data, Hibernate, EJBs, JDBC, Jackson, Log4j, Java FileSystem, interfaces, DB2, HSQLDB, SQL, DBeaver, Excel, REST, JSON, Apache ActiveMQ, JMS, SFTP server, Samba/SMB, Maven, TestNG, Jenkins, Ansible, GitHub, GitBlit, Sourcetree, Eclipse, Visual Paradigm, Confluence, Jira, FileZilla

Nov 2017 - Nov 2018

1 year 1 month

Requirements Engineer, Application Developer

Greenergetic GmbH

Frontend development
Expansion of the portal
Technical optimization of the portal
Applied tools and technologies: Java, Spring Boot, Spring Data JPA, JSF 2.2, PrimeFaces 6.1, Liferay, Portlets, Composite Components, Log4j, Elasticsearch, MySQL, SQL, JavaScript, HTML, CSS, jQuery, JSON, Docker, VPN, Maven, IntelliJ IDEA

Oct 2017 - Oct 2017

1 month

Mannheim, Germany

Software Developer

PLOIN GmbH

Graphical representation of load profiles (any other time series possible)
Data input via upload or manually
Applied tools and technologies: Java, Spring Boot, Spring Data JPA, Thymeleaf, Apache POI, OpenCSV, GSON, H2-DB, SQL, JSON, Highstock, Highcharts, JavaScript, HTML, CSS, jQuery, Maven, IntelliJ IDEA

Oct 2016 - Sep 2017

1 year

Requirements Engineer, Application Developer

MVV Energie AG / Soluvia IT-Services GmbH

Close collaboration with the client
Definition of requirements
Integration of internal and external data sources
Data visualization
Checking feasibility of requirements
Development of functionalities
Applied tools and technologies: Java 8, JSF 2.2, Spring, JPA, Hibernate, CDI, PrettyFaces, Quartz, Jackson, Gson, Apache POI, JasperReports, PDFBox, Rome, HikariCP, Log4j, SLF4J, HSQLDB, OJDBC, SQL, JSoup, Xerces, XML, REST, SOAP, JSON, WSDL, OData, OAuth, JAX-RS, Apache CXF, Apache Olingo, Swagger/OpenAPI, JavaScript, jQuery, HTML5, CSS3, Bootstrap, Highstock, Highcharts, Google Maps API, Maven, GitHub, Jenkins, TestNG, JUnit, Mockito, Selenium, PhantomJS, LoadUI, SoapUI, Eclipse, IntelliJ IDEA, Jira, Scrum

Oct 2011 - Sep 2016

5 years

Requirements Engineer, Application Developer

MVV Energie AG / Soluvia IT-Services GmbH

Close collaboration with the client
Definition of requirements
Integration of internal and external data sources
Data visualization
Checking feasibility of requirements
Development of functionalities
Applied tools and technologies: Java, Spring, JPA, Hibernate, JSF 2.2, PrettyFaces, CDI, Quartz, Jackson, Gson, Apache POI, JasperReports, Rome, PDFBox, HikariCP, Log4j, SLF4J, HSQLDB, OJDBC, SQL, JSoup, REST, SOAP, JSON, WSDL, OData, OAuth, JAX-RS, Apache CXF, Apache Olingo, Swagger/OpenAPI, JavaScript, jQuery, HTML5, CSS3, Bootstrap, Highstock, Highcharts, Google Maps JavaScript API, Maven, TestNG, JUnit, Mockito, Selenium, PhantomJS, GitHub, Jenkins, Jira, Scrum

Summary

I am a Seasoned Senior Full-Stack Developer with a proven track record in technical leadership and implementation.

With over 15 years of experience in Java development, I specialize in the conception and creation of robust system and software architectures. My expertise includes 7+ years of Microservices and deep practical experience with Spring Boot as well as modern frontends (React).

I am proficient in integrating complex systems, based on over 10 years of REST and SOAP interfaces. Furthermore, I bring a specialization in DevOps and CI/CD (e.g., 7+ years of Jenkins, Docker) to ensure stable and automated software deployment.

As an Experienced Lead Developer, I provide technical guidance and mentoring to ensure high implementation quality. My focus lies on pragmatic problem-solving, Clean Code, and the immediate delivery of efficient solutions. I am immediately available for new challenges.