Jens B. - Senior Fullstack Developer

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Mannheim, Germany

Experience

Dec 2023 - Present

1 year 11 months

Mannheim, Germany

Executive Management Advisor

PLOIN GmbH

Supported management in the transformation process to a mid-sized company regarding technical infrastructure
Fostered development of student interns, junior developers, etc.
Designed and technically implemented new processes
Contributed to company strategy (medium- and long-term planning)
Collaborated on defining units and functions within the company and supported scaling of individual areas (technical and organizational)
Participated in selecting technologies, software, infrastructure, etc.
Developed automation for standard processes, integration between application areas, creation of forms, etc.
Ongoing training in technologies such as React, TypeScript, Thymeleaf, Docker, etc.

May 2021 - Dec 2023

2 years 8 months

Senior Developer / Lead Developer

Commerzbank AG

Took over and enhanced an existing React.js prototype
Set up a Maven project to integrate the frontend into CI/CD
Deployed the frontend to the cloud using OpenShift (Kubernetes)
Worked conceptually on overall structure and deployment process
Planned new versions and migration process, including scheduling
Led development of the new version based on the current Java framework
Coordinated and aligned with framework specialists
Operated and supported a central participant management tool
Enhanced existing applications in collaboration with the project team
Applied tools and technologies: React, Java, Node, NPM, Spring, OAuth, Maven, OpenShift, S2I, OC-CLI, Bitbucket, Nexus, Git, 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

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

Nov 2018 - Dec 2019

1 year 2 months

Lead Developer

ITZBund / Materna

Served as team lead and coach for the development team
Acted as liaison between project management and development team
Designed and developed 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 database, SQL, SharePoint, SOAP, REST, XML, SAXParser, Maven, JUnit, Mockito, Arquillian, Selenium, Jenkins, Git, Jira, Scrum, JBoss, IntelliJ IDEA, JavaScript, jQuery, HTML5, SAML

Mar 2018 - Aug 2018

6 months

Requirements Engineer, Developer

INTER Versicherungsgruppe

Created and documented test setups
Collaborated closely with group leaders and senior developers
Developed adapters for systems required by the test setups
Developed test cases in collaboration with the testing department and business stakeholders
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, Git, 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 display of load curves (or any other time series)
Data entry 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
Gathering requirements
Integration of internal and external data sources
Checking the 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, Git, 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
Gathering requirements
Integration of internal and external data sources
Checking the 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, Git, 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.